Document:

<PAGE>

                                                                    Exhibit 10.3

                            SUPPLEMENTAL AGREEMENT
 (Amending and Supplementing the Contribution Agreement and the LLC Agreement)

     This Supplemental Agreement (this "Agreement") is made as of the 15th day
of August 2000 among CARRAMERICA REALTY CORPORATION, a Maryland Corporation,
("CarrAmerica"), CARRAMERICA REALTY, L.P., a Delaware limited partnership ("Carr
L.P."), CARRAMERICA DEVELOPMENT, INC., a Delaware corporation ("Development
Inc."), CARR DEVELOPMENT & CONSTRUCTION, L.P., a Delaware limited partnership
("Development L.P."), CARR PARKWAY NORTH I CORPORATION, a Delaware corporation
("Parkway Corp.") (the foregoing entities are collectively sometimes referred to
as the "Carr Entities") and NEW YORK STATE TEACHERS' RETIREMENT SYSTEM, a public
pension system created and existing pursuant to Article 11 of The Education Law
of New York and having powers and privileges of a corporation pursuant to
Section 502 thereof ("NYSTRS").

Recitals:
--------

     1.   This Agreement is made simultaneously and in connection with the
execution of (i) that certain Contribution and Purchase/Sale Agreement of even
date herewith among the Carr Entities and NYSTRS (the "Contribution Agreement")
and (ii) that certain Amended and Restated Limited Liability Company Agreement
of Carr Office Park L.L.C. among the Carr Entities (except Development Inc. and
Development L.P.) and NYSTRS (the "LLC Agreement") creating Carr Office Park,
LLC (the "LLC").

     2.   Except as otherwise expressly provided herein, the capitalized terms
in this Agreement shall have the same meaning as they do in the Contribution
Agreement.

     3.   Parkway Corp. has been unable to obtain the approval of the Existing
Lender for the contribution of Building 1 ("Building 1") of Parkway North Office
Park ("Parkway North") to the LLC subject to the Loan Documents in time for the
Closing. Parkway Corp. shall use commercially reasonable efforts to try to
obtain such approval, and the Carr Entities and NYSTRS have agreed to conduct
the Closing without the contribution of Building 1 to the LLC at the Closing in
accordance with the Contribution Agreement, as amended and supplemented by this
Agreement.

Agreement:
---------

     1.   Agreement to Contribute. Subject to the terms and conditions set forth
          -----------------------
herein, Parkway Corp. agrees to contribute to the LLC, and NYSTRS and the other
Carr Entities who are Members of the LLC, as members of the LLC, agree to accept
the contribution of Building 1 to
<PAGE>

the LLC. The contribution of Building 1 to the LLC, pursuant to this Agreement
(the "Building 1 Closing") is a separate and independent transaction from the
Closing, and, subject to the terms and conditions herein, shall occur on a date
selected by the parties (the "Building 1 Closing Date"), but in no event later
than December 1, 2000, unless such date is extended in the sole and absolute
discretion of NYSTRS to no later than February 1, 2001 (the "Outside Closing
Date"). Parkway Corp. shall not become a Member of the LLC unless and until the
Building 1 Closing occurs and the Contribution Agreement and the LLC Agreement
shall be deemed amended to reflect this fact. In the event that the Building 1
Closing does not occur and Building 1 is not contributed to the LLC the parties
agree to amend and restate the LLC Agreement to reflect the fact that Parkway
Corp. is not a party thereto and to make conforming changes.

     2.   Contribution Value. The Contribution Value for the Properties is
          ------------------
hereby revised to exclude the amount thereof allocable to Building 1 (i.e.,
$40,176,000 prior to adjustment as shown in Schedules 3(a) and 3(c) to the
Contribution Agreement and Exhibit A-1 to the LLC Agreement). If and when the
Building 1 Closing occurs, the Contribution Value for all of the Properties
(including Building 1), and for all purposes under the Contribution Agreement,
shall be increased by the Building 1 Contribution Value. The "Building 1
Contribution Value" shall be $43,063,293 (i.e., the adjusted Contribution Value
for Building 1 as shown in Schedules 3(a) and 3(c) to the Contribution Agreement
and Exhibit A-1 to the LLC Agreement), as further increased by the amount of
leasing commissions, tenant improvement costs and other out-of-pocket expenses
incurred by Parkway Corp. in connection with leasing activities in Building 1
after the Closing through the Building 1 Closing Date which have been approved
by NYSTRS under Paragraph 3 below or by the Management Committee of the LLC
pursuant to Section 6.3 of the LLC Agreement or are otherwise in conformance
with the approved Business Plan for Building 1. Amended Schedules 3(a) and 3(c),
reflecting the exclusion of the Contribution Value allocable to Building 1, are
attached hereto.

     3.   Operations. Until the earlier of the Building 1 Closing Date or the
          ----------
Outside Closing Date, Parkway Corp. shall operate and manage Building 1 in the
same manner and to the same standard as previously managed. Parkway Corp. shall
not enter into any material agreement or lease, or amendment to existing
material agreement or lease, without the prior approval of NYSTRS, such approval
not to be unreasonably withheld, conditioned or delayed. The Business Plan and
its components include Building 1 and for purposes of this Section 3 shall apply
to the operation and management of Building 1 from the Closing Date up to the
Building 1 Closing Date. Parkway Corp. shall continue to maintain "all risk"
property insurance for Building 1 as currently maintained. Parkway Corp. shall
not make any expenditures related to capital improvements to Building 1 not
contemplated by the approved Business Plan, except for emergencies, without the
prior approval of NYSTRS, such approval not to be unreasonably withheld,
conditioned or delayed.

     4.   Updated Information. After the Closing and no later than three (3)
          -------------------
Business Days before the Building 1 Closing Date, Parkway Corp. shall provide to
NYSTRS updated Rent Rolls and Financial Statements that are produced in the
ordinary course of business with respect to

                                       2
<PAGE>

Building 1, which updated Rent Rolls and Financial Statements shall be delivered
to NYSTRS in accordance with the Contribution Agreement, and shall be subject to
the representations and warranties set forth in the Contribution Agreement.

     5.   Representations and Warranties. Parkway Corp. hereby makes to NYSTRS
          ------------------------------
the representations and warranties in Section 9 of the Contribution Agreement
with respect to itself and Building 1, and shall remake such representations and
warranties as of the Building 1 Closing Date, subject to the Representation
Exceptions. The "Representation Exceptions" are any specific exceptions to the
representations and warranties that arise by reason or facts or circumstances
first arising or known (to the Carr Entities' knowledge) after the Closing and
not resulting from the breach by Parkway Corp. of this Agreement. The
Representation Exceptions shall be in writing and must be delivered to NYSTRS at
least three Business Days before the Building 1 Closing. The representations and
warranties made by Parkway Corp. under Section 9 of the Contribution Agreement
and remade pursuant to this Agreement are subject to the limitation of Sections
12(d) and 13 of the Contribution Agreement (provided that the 14 month
limitation period in Section 12(d) shall begin on the Building 1 Closing Date.)
The updated representations and warranties in Section 9(a)(xvi) of the
Contribution Agreement shall apply to the Leases in Building 1 for which Tenant
Estoppel Certificates were obtained in connection with the Closing with respect
to the period from the date of such Certificates to the Building 1 Closing Date.

     6.   Conditions. The Building 1 Closing shall be subject to the
          ----------
satisfaction, as of the Building 1 Closing Date, of the following conditions:

          (1)  The Existing Lender shall have approved the transfer of Building
     1 to the LLC without any modification to the Loan Documents or otherwise
     subject to such modifications as are satisfactory to NYSTRS, and NYSTRS
     shall have approved the form of all assignment and assumption documents
     related to the assumption of the Loan and all requirements of Existing
     Lender related thereto.

          (2)  Except as set forth in clause (e) below, the Representations
     Exceptions do not materially and adversely modify the representations and
     warranties set forth in Section 9 of the Contribution Agreement, and such
     representations and warranties, as modified, shall be true and correct in
     all material respects.

          (3)  Parkway Corp. shall have fully performed its obligations
     hereunder in all material respects.

          (4)  This Agreement shall not have been terminated pursuant to
     Paragraph 9 hereof.

          (5)  There shall have been no material adverse change in the
     structural condition of Building 1 arising after the Closing and not cured
     as of the Building 1

                                       3
<PAGE>

     Closing Date, and there shall have occurred after the Closing no material
     adverse violations of any Environmental Laws with regard to Building 1
     which are outstanding as of the Building 1 Closing Date, and Parkway Corp.
     shall deliver a representation and warranty to such effect to NYSTRS, to
     its knowledge, as of the Building 1 Closing Date.

     If these conditions are not satisfied as of the Building 1 Closing Date,
then either Parkway Corp. (only if the failure of condition falls under
paragraph (a) above) or NYSTRS may (i) postpone the Building 1 Closing Date from
time to time until the Outside Closing Date; (ii) at any time on or before the
Outside Closing Date waive in writing any such condition and close the
transaction; or (iii) elect that Building 1 not be contributed to the LLC.  Any
election of (ii) or (iii) above before the Outside Closing Date must be given in
writing, and any failure to elect (ii) or (iii) shall constitute an election of
(i) until the Outside Closing Date, when, unless an election is made to waive
any unsatisfied condition, subject to the right of NYSTRS to pursue any remedy
in the case of a breach by Parkway Corp.  of its obligations hereunder, this
Agreement shall terminate.

     7.   The Building 1 Closing. The Building 1 Closing shall be conducted in a
          ----------------------
manner consistent with the Closing under the Contribution Agreement. In
particular and without limitation, at the Building 1 Closing:

          (1)  Parkway Corp. shall make the deliveries described in Section
     10(a) of the Contribution Agreement with respect to Building 1 except for
     the Tenant Estoppel Certificates, which shall be delivered by Parkway Corp.
     at the Closing.

          (2)  Parkway Corp. shall cause to be delivered to the LLC a Title
     Policy in the form of the pro forma policy attached hereto as Exhibit 7(b).

          (3)  The parties shall make the contributions and distributions
     described in Paragraph 8(b) below and Schedules 3(a) and 3(c) of the
     Contribution Agreement shall be amended, and the Contribution Agreement
     amended accordingly, to reflect such contributions and distributions. After
     such contributions and distributions, the aggregate Percentage Interest (as
     defined in the LLC Agreement) of the Carr Members (including Parkway North)
     shall remain 35% with the Percentage Interests of each Carr Member
     readjusted to reflect the capital contribution of Parkway Corp. relative to
     the other Carr Members.

          (4)  Parkway Corp. shall be admitted to the LLC as a Carr Member.

          (5)  Apportionments and adjustments shall be made as of the Building 1
     Closing Date in a manner consistent with Section 11 of the Contribution
     Agreement.

          (6)  All costs of the Building 1 Closing shall be paid by the LLC in
     accordance with Section 11 of the Contribution Agreement.

                                       4
<PAGE>

          (7)  Parkway Corp., the LLC and Carr Real Estate Services, Inc. shall
     either enter into an addendum to the Property Management and Leasing
     Agreement for Parkway North as may be reasonably necessary to subject
     Building 1 to the terms and provisions thereof, or shall enter into a new
     Property Management and Leasing Agreement with regard to Building 1 under
     the same terms and conditions.

     8.   Provisions Relating to the LLC Agreement
          ----------------------------------------

          (1)  Exhibit A-1 and Exhibit B to the LLC Agreement are amended to
     reflect the exclusion of Building 1 from the Closing and, as amended, are
     attached hereto as Exhibit A-1 and Exhibit B, respectively. Such exhibits
     shall be further amended, and the LLC Agreement amended accordingly, when,
     and if, the Building 1 Closing occurs to reflect the contribution of
     Building 1.

          (b)  Section 3.1 of the LLC Agreement is amended to reflect the
     following Percentage Interests of the Carr Members at the Closing: (i)
     CarrAmerica: 13.83% and (ii) Carr L.P.: 21.18%.  Section 3.1 of the LLC
     Agreement shall be further amended when, and if, the Building 1 Closing
     occurs to reflect the contribution of Building 1 to the LLC, consistent
     with Section 7(c) above.

          (c)  At the Building 1 Closing:

               (1)    Parkway Corp. shall contribute to the LLC its interest in
     Building 1 for the Building 1 Contribution Value;

               (2)    NYSTRS shall contribute to the LLC by wire transfer an
     amount equal to 65% of (A) the sum derived by subtracting the principal
     balance due the Existing Lender under its loan to Parkway Corp. from the
     Building 1 Contribution Value, and (B) the amount of any cash expenditures
     for closing costs and other items incurred by the LLC in connection with
     the Building 1 Closing;

               (3)    Parkway Corp. shall make a cash contribution equal to 35%
     of the amount in (ii) (B) above; and

               (4)     The Carr Entities and NYSTRS shall cause the LLC to
     distribute to Parkway Corp. and the other Contributing Carr Entities by
     wire transfer a sum equal to the amount contributed by NYSTRS under (ii) A
     above. The distributions shall be made to the Contributing Carr Entities in
     such manner as determined by such Carr Entities and consistent with the
     distribution amounts shown on the original Schedule 3(c) to the
     Contribution Agreement.

                                       5
<PAGE>

     9.   Casualty or Condemnation. If, prior to the Building 1 Closing,
          ------------------------
Building 1 shall suffer any damage or destruction that is not material or a
condemnation or eminent domain proceeding that is not material: (i) such
casualty or condemnation shall not affect the obligations of the parties to
consummate the Building 1 Closing; and (ii) the Building 1 Closing shall occur
hereunder, without any reduction of the Building 1 Contribution Value; provided,
however, that if Parkway Corp. does not maintain the "all-risk" property
insurance (in the amount of full replacement value), and rental abatement
insurance, which it currently maintains, or if there is a casualty which is
uninsured which exceeds $100,000 in excess of the applicable deductible, then
NYSTRS, in its sole and absolute discretion, may terminate this Agreement. If,
after the date hereof and prior to the Building 1 Closing, Building 1 shall
suffer a material casualty or shall be subject to a material condemnation, then
NYSTRS shall have the option to terminate this Agreement, upon notice to Parkway
Corp. given not later than 15 days after receipt of such notice, or the Outside
Closing Date, whichever is earlier. For the purposes of this Section, a
"material casualty" means a casualty exceeding $1,000,000 in damages as
reasonably determined by a contractor selected by Parkway Corp. and subject to
NYSTRS reasonable approval or pursuant to which Tenants representing five
percent (5%) of the net operating income have a right to terminate their leases,
and a "material condemnation" means proceedings, or threatened proceedings, in
eminent domain where (i) the award exceeds or is reasonably expected to exceed
$1,000,000 or (ii) the taking is reasonably expected to materially impair access
or (iii) as a result of such taking Tenants representing five percent (5%)of the
net operating income have a right to terminate their leases. If, in any case,
the Building 1 Closing proceeds: (i) Parkway Corp. shall transfer, assign and
pay to the LLC (A) in the case of a casualty, all insurance proceeds with
respect to such casualty previously received by Parkway Corp. and all rights of
Parkway Corp. to any insurance proceeds remaining to be paid with respect to
such casualty (and Parkway Corp. shall credit the LLC by reducing the Building 1
Contribution Value by the amount of any uninsured loss, including the
deductible) or (B) in the case of a condemnation all proceeds and awards with
respect to such condemnation theretofore received by Seller and all rights of
Seller to receive any such awards, payments or proceeds remaining to be paid
with respect to such Condemnation, in each case of (A) or (B): (1) less any such
proceeds or awards payable in respect of business interruption or loss of rental
income for periods prior to the Building 1 Closing Date, (2) less any amounts
paid or incurred by Parkway Corp. to protect or restore Building 1, (3) less any
reasonable amounts (including reasonable attorneys' fees) paid by Parkway Corp.
to claim for or collect such proceeds or awards and (4) subject to the
requirements of the Loan Documents, Leases in Building 1 or other contracts
relating to Building 1. Notwithstanding the foregoing, if Parkway Corp. has
maintained its insurance as aforesaid, but the amount of the insured loss
(including the deductible) exceeds $1,000,000, Parkway Corp. shall not be
required to proceed to the Building I Closing and may terminate this Agreement
(subject to the surviving obligations hereunder).

     10.  Conflict of Interest.  So long as a Carr Entity or an affiliate
          --------------------
thereof is a member of the LLC, with regard to the leasing of Building 1,
CarrAmerica agrees to use best efforts to enforce on behalf of the LLC against
Parkway Corp. a covenant by Parkway Corp., and Parkway Corp. does hereby
covenant for the benefit of the LLC for so long as a Carr Entity or an affiliate

                                       6
<PAGE>

thereof is a member of the LLC, not to undertake leasing activities for Building
1 or enter into Leases with Tenants for Building 1 which would unfairly
disadvantage leasing transactions proposed for Parkway North, such as by
offering below market concessions to potential tenants.  In the event that
CarrAmerica, in the reasonable judgment of NYSTRS, is not enforcing this
covenant of Parkway Corp., then NYSTRS shall be entitled to enforce this
covenant of Parkway Corp. on behalf of the LLC.  The foregoing covenants shall
terminate if the LLC is no longer in existence or no longer owns any of Parkway
North.

     11.  Notices.  All demands, requests or other communications (collectively,
          -------
"notices") required to be given or which may be given hereunder shall be in
writing and shall be sent by (a) certified or registered mail, return receipt
requested, postage prepaid, or (b) national prepaid overnight delivery service,
or (c) telecopy or other facsimile transmissions (followed with hard copy sent
by national prepaid overnight delivery service), or (d) personal delivery with
receipt acknowledged in writing, directed to:

Each Carr Entity:                 c/o CarrAmerica Realty Corporation
                                  1850 K Street, N.W., Suite 500
                                  Washington, D.C. 20006
                                  Attn:  Ms. Karen B. Dorigan
                                  Fax Number:  202/729-1060

With a copy to:                   Mayer, Brown & Platt
                                  190 South LaSalle Street
                                  Chicago, Illinois 60603
                                  Attn:  Jeffrey Usow, Esq.
                                  Fax Number:  312/706-8725

NYSTRS:                           New York State Teachers' Retirement System
                                  c/o J.P. Morgan Investment Management Inc.
                                  522 Fifth Avenue
                                  New York, New York 10036
                                  Attn:  Mr. Benjamin Gifford
                                  Fax Number:  212/837-1696

with a copy to:                   New York State Teachers' Retirement System
                                  10 Corporate Woods Drive
                                  Albany, New York 12211-2395
                                  Attn:  Mr. John Virtanen
                                  Fax Number:  518/447-2766

with a copy to:                   Joseph M. Fries,, Esq.
                                  Arent Fox Kintner Plotkin & Kahn, PLLC
                                  1050 Connecticut Avenue, N.W.

                                       7
<PAGE>

                           Washington, D.C.  20036-5339
                           Fax Number:  202/857-6395

Any notice so sent by certified or registered mail shall be deemed given on the
date of receipt or refusal as indicated on the return receipt.  All other
notices shall be deemed given when actually received or refused by the party to
whom the same is directed.  A notice may be given either by a party or by such
party's attorney.  The Carr Entities and NYSTRS may designate by not less than
five business days' notice given to the other in accordance with the terms of
this Section, additional or substituted parties to whom notices should be sent
hereunder.

     12.  Amendments.  This Agreement may not be modified or terminated orally
          ----------
or in any manner other than by an agreement in writing signed by all the parties
hereto or their respective successors in interest.  In the event of any
inconsistency of any terms of this Agreement with any terms of the LLC Agreement
or the Contribution Agreement, the terms of this Agreement shall be paramount.

     13.  Governing Law; Construction.  This Agreement (a) shall be governed by
          ---------------------------
and construed in accordance with the laws of the State of New York, without
giving effect to principles of conflicts of law and (b) shall be given a fair
and reasonable construction in accordance with the intentions of the parties
hereto and without regard to, or aid of, any rules of construction requiring
construction against any party drafting this Agreement.  Each party hereto
acknowledges that it has participated in the drafting of this Agreement, and any
applicable rule of construction to the effect that ambiguities are to be
resolved against the drafting party shall not be applied in connection with the
construction or interpretation hereof.  Each party has been represented by
independent counsel in connection with this Agreement.  For purposes of
construction of this Agreement, provisions which are deleted or crossed out and
initialed by the parties shall be treated as if never included herein.

     14.  Partial Invalidity.  If any provision of this Agreement is held to be
          ------------------
invalid or unenforceable as against any person or under certain circumstances,
the remainder of this Agreement and the applicability of such provision to other
persons or circumstances shall not be affected thereby.  Each provision of this
Agreement shall be valid and enforceable to the fullest extent permitted by law.

     15.  Counterparts.  This Agreement may be executed in any number of
          ------------
counterparts, each of which shall constitute an original, but all of which,
taken together, shall constitute but one and the same instrument.  This
Agreement may be executed by facsimile, which shall be deemed an original for
all purposes.  In the event this Agreement is executed by the exchange of
facsimile copies, the parties agree to exchange ink-signed counterparts promptly
after the execution and delivery of this Agreement.

                                       8
<PAGE>

     16.  No Third Party Beneficiaries.  The warranties, representations,
          ----------------------------
agreements and undertakings contained herein shall not be deemed to have been
made for the benefit of any person or entity other than the parties hereto.

     17.  Waivers.  No failure or delay of either party in the exercise of any
          -------
right given to such party hereunder or the waiver by any party of any condition
hereunder for its benefit (unless the time specified herein for exercise of such
right, or satisfaction of such condition, has expired) shall constitute a waiver
of any other or further right nor shall any single or partial exercise of any
right preclude other or further exercise thereof or any other right.  The waiver
of any breach hereunder shall not be deemed to be waiver of any other or any
subsequent breach hereof.

     18.  Assignment.  Neither NYSTRS nor the Carr Entities may assign this
          ----------
Agreement or any of their rights hereunder, except to a permitted assignee of
its membership interest in the LLC, and any purported unpermitted assignment
shall be null and void.

     19.  Binding Effect.  This Agreement is binding upon, and shall inure to
          --------------
the benefit of, the parties and each of their respective successors and
permitted assigns, if any.

     20.  Entire Agreement.  This is the entire agreement among the parties
          ----------------
amending and supplementing the Contribution Agreement and the LLC Agreement with
respect to Building 1, and there are no other terms, obligations, covenants,
representations, statements or conditions, oral or otherwise, of any kind
whatsoever.  Any agreement hereafter made shall be ineffective to change,
modify, discharge or effect an abandonment of this Agreement in whole or in part
unless such agreement is in writing and signed by the party against whom
enforcement of the change, modification, discharge or abandonment is sought.

     21.  Further Assurances.  Both prior to and after the Closing Date and the
          ------------------
Building 1 Closing Date, NYSTRS and the Carr Entities shall execute and deliver
each to the other such documents and instruments and take such further actions
as may be reasonably necessary or required to consummate the transactions
contemplated by this Agreement.

     22.  Paragraph Headings.  The headings of the various paragraphs of this
          ------------------
Agreement have been inserted only for the purpose of convenience and are not
part of this Agreement and shall not be deemed in any manner to modify, expand,
explain or restrict any of the provisions of this Agreement.

     23.  Survival.  The provisions of this Agreement shall survive the Building
          --------
1 Closing indefinitely, except that the representations and warranties described
in Section 5 shall survive the Building 1 Closing for a period of fourteen (14)
months.  If the Building 1 Closing does not occur by the Outside Closing Date,
as extended as permitted hereby, then the provisions of this Agreement shall
terminate and shall be of no further force or effect, except for the provisions
of the last sentence of Section 1 and of Sections 10 and 25, which shall survive
indefinitely.

                                       9
<PAGE>

     24.  Closing.  Notwithstanding that the Contribution Agreement, the LLC
          -------
Agreement and this Agreement are dated as of August 15, 2000, the parties hereto
understand and agree that this Agreement is being executed, and the Closing of
the transaction contemplated by the Contribution Agreement is occurring, on
August 17, 2000.

     25.  No Building 1 Closing.  In the event that the Building 1 Closing does
          ---------------------
not occur, then if at any time during the existence of the LLC (so long as a
Carr Entity or an affiliate thereof is a member of the LLC) Parkway Corp.
desires to market for sale Building 1, then Parkway Corp. shall notify the LLC
thereof in writing (the "First Offer Notice").  Any First Offer Notice shall set
forth Parkway Corp.'s proposals as to the sale price ("First Offer Price"), the
closing date, and such other material terms and conditions that it will
initially offer to the market.  Within thirty (30) days after Parkway Corp.'s
delivery of any First Offer Notice, the LLC shall notify Parkway Corp., in
writing, as to whether the LLC accepts the First Offer Price and agrees to
purchase Building 1 (the "First Offer Election Notice").  If the LLC fails to
deliver the First Offer Election Notice to Parkway Corp. within such thirty (30)
day period, then the LLC shall be conclusively deemed not to have exercised its
rights hereunder with respect to the First Offer Property, and all of the LLC's
rights and all of Parkway Corp.'s obligations set forth in this Section 25 with
respect to Building 1 shall automatically terminate and be of no further force
or effect, subject to the next sentence.  If the LLC does not deliver the First
Offer Election Notice and Parkway Corp. thereafter intends to market Building 1
at a price which is less than ninety-five percent (95%) of the First Offer
Price, then Parkway Corp. shall deliver to the LLC a renewed First Offer Notice
specifying the revised First Offer Price, and the provisions above with respect
to the response of the LLC thereto shall be applicable.  If the LLC delivers the
First Offer Election Notice and agrees to purchase Building 1, at the election
of the Carr Members, the transaction may be structured as a contribution of
Building I to the LLC so long as NYSTRS suffers no economic detriment.
Notwithstanding any other term of the LLC Agreement, and subject to the
preceding sentence, the representative of NYSTRS on the LLC Management Committee
shall have the right to make all decisions on behalf of the LLC with regard to
the First Offer Election Notice and the response to the First Offer Notice,
subject to the approval of the Carr Members' representative on the LLC
Management Committee, such approval not to be unreasonably withheld, delayed or
conditioned.

                      [Signatures Begin on the Next Page]

                                       10
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have duly executed this Agreement on
the day and year first above written.

                              The Carr Entities:

                              CARRAMERICA REALTY CORPORATION,
                               a Maryland corporation

                              By: /s/Karen B. Dorigan
                                 -----------------------------
                                 Karen B. Dorigan
                                 Managing Director/Capital Markets and
                                 Investments

                              CARRAMERICA REALTY, L.P., a Delaware limited
                               partnership

                              By:  CARRAMERICA REALTY GP HOLDINGS, INC., a
                                   Delaware corporation, its general partner

                                   By: /s/Karen B. Dorigan
                                      ------------------------
                                      Karen B. Dorigan
                                      Executive Vice President

                              CARRAMERICA DEVELOPMENT, INC.,
                               a Delaware corporation

                              By: /s/James S. Williams
                                 -----------------------------
                                 James S. Williams
                                 President
<PAGE>

                         CARRAMERICA DEVELOPMENT & CONSTRUCTION, L.P., a
                         Delaware limited partnership

                         By:  CDC TEXAS HOLDINGS, INC., a Delaware corporation,
                              its general partner

                              By: /s/James S. Williams
                                 -----------------------------
                                 James S. Williams
                                 President

                         CARR PARKWAY NORTH I CORPORATION, a Delaware
                         corporation

                         By: /s/Karen B. Dorigan
                            -----------------------
                            Karen B. Dorigan
                            Executive Vice President
<PAGE>

                         NYSTRS:

                         NEW YORK STATE TEACHERS' RETIREMENT SYSTEM, a public
                         pension system created and existing pursuant to Article
                         11 of the Education Law of the State of New York and
                         having powers and privileges of a corporation pursuant
                         to Section 502 thereof

                         By: /s/George Philip
                            ---------------------------
                            George Philip
                            Executive Director

                         By: /s/John W. Virtanen
                            ---------------------------
                            John W. Virtanen
                            Associate Real Estate Officer<PAGE>

                                                                     EXHIBIT 4.1

--------------------------------------------------------------------------------

                        ______________________________
                                _______________

                            XM Satellite Radio Inc.

                       14% SENIOR SECURED NOTES DUE 2010

                                _______________

                                   INDENTURE

                          Dated as of March 15, 2000

                                _______________

                                _______________

                    United States Trust Company of New York

                                    Trustee

                                _______________

--------------------------------------------------------------------------------
<PAGE>

                            CROSS-REFERENCE TABLE*

Trust Indenture Act Section                                Indenture Section
310(a)(1)..........................................                  7.10
     (a)(2)........................................                  7.10
     (a)(3)........................................                   N.A.
     (a)(4)........................................                   N.A.
     (a)(5)........................................                  7.10
     (b)...........................................                  7.10
     (c)...........................................                   N.A.
311(a).............................................                  7.11
     (b)...........................................                  7.11
     (c)...........................................                   N.A.
312(a).............................................                  2.05
     (b)...........................................                 13.03
     (c)...........................................                 13.03
313(a).............................................                  7.06
     (b)(1)........................................                 10.03
     (b)(2)........................................                  7.07
     (c)...........................................            7.06;13.02
     (d)...........................................                  7.06
314(a).............................................            4.03;13.02
     (b)...........................................                 10.02
     (c)(1)........................................                 13.04
     (c)(2)........................................                 13.04
     (c)(3)........................................                   N.A.
     (d)...........................................   10.03, 10.04, 10.05
     (e)...........................................                 13.05
     (f)...........................................                   N.A.
 315(a)............................................                  7.01
     (b)...........................................            7.05,13.02
     (c)...........................................                  7.01
     (d)...........................................                  7.01
     (e)...........................................                  6.11
316(a) (last sentence).............................                  2.09
     (a)(1)(A).....................................                  6.05
     (a)(1)(B).....................................                  6.04
     (a)(2)........................................                   N.A.
     (b)...........................................                  6.07
     (c)...........................................                  2.12
317(a)(1)..........................................                  6.08
     (a)(2)........................................                  6.09
     (b)...........................................                  2.04
318(a).............................................                 13.01
     (b)...........................................                   N.A.
     (c)...........................................                 13.01

N.A. means not applicable.
*  This Cross Reference Table is not part of this Indenture.
<PAGE>

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                                  Page
<S>                                                                                               <C>

                                        ARTICLE 1.
                              DEFINITIONS AND INCORPORATION
                                       BY REFERENCE

Section 1.01.  Definitions...............................................................            1
Section 1.02.  Other Definitions.........................................................           19
Section 1.03.  Incorporation by Reference of Trust Indenture Act.........................           20
Section 1.04.  Rules of Construction.....................................................           20

                                        ARTICLE 2.
                                        THE NOTES

Section 2.01.  Form and Dating...........................................................           21
Section 2.02.  Execution and Authentication..............................................           21
Section 2.03.  Registrar and Paying Agent................................................           22
Section 2.04.  Paying Agent to Hold Money in Trust.......................................           22
Section 2.05.  Holder Lists..............................................................           22
Section 2.06.  Transfer and Exchange.....................................................           22
Section 2.07.  Replacement Notes.........................................................           33
Section 2.08.  Outstanding Notes.........................................................           33
Section 2.09.  Treasury Notes............................................................           34
Section 2.10.  Temporary Notes...........................................................           34
Section 2.11.  Cancellation..............................................................           34
Section 2.12.  Defaulted Interest........................................................           34

                                       ARTICLE 3.
                                REDEMPTION AND PREPAYMENT

Section 3.01.  Notices to Trustee........................................................           35
Section 3.02.  Selection of Notes to Be Redeemed.........................................           35
Section 3.03.  Notice of Redemption......................................................           35
Section 3.04.  Effect of Notice of Redemption............................................           36
Section 3.05.  Deposit of Redemption Price...............................................           36
Section 3.06.  Notes Redeemed in Part....................................................           36
Section 3.07.  Optional Redemption.......................................................           36
Section 3.08.  Mandatory Redemption......................................................           37
Section 3.09.  Offer to Purchase by Application of Excess Proceeds.......................           37

                                       ARTICLE 4.
                                       COVENANTS

Section 4.01.  Payment of Notes..........................................................           39
Section 4.02.  Maintenance of Office or Agency...........................................           39
Section 4.03.  Reports...................................................................           39
Section 4.04.  Compliance Certificate....................................................           40
Section 4.05.  Taxes.....................................................................           41
Section 4.06.  Stay, Extension and Usury Laws............................................           41
Section 4.07.  Restricted Payments.......................................................           41
Section 4.08.  Dividend and Other Payment Restrictions Affecting Restricted
               Subsidiaries..............................................................           43
</TABLE>

                                       i
<PAGE>

<TABLE>
<S>                                                                                                 <C>
Section 4.09.  Incurrence of Indebtedness and Issuance of Preferred Stock................           44
Section 4.10.  Asset Sales...............................................................           46
Section 4.11.  Transactions with Affiliates..............................................           48
Section 4.12.  Liens.....................................................................           48
Section 4.13.  Corporate Existence.......................................................           49
Section 4.14.  Offer to Repurchase Upon Change of Control................................           49
Section 4.15.  Limitation on Sale and Leaseback Transactions.............................           50
Section 4.16.  Limitation on Issuances and Sales of Capital Stock of Wholly Owned
               Subsidiaries..............................................................           50
Section 4.17.  Payments for Consent......................................................           50
Section 4.18.  Insurance.................................................................           51

                                        ARTICLE 5.
                                        SUCCESSORS

Section 5.01.  Merger, Consolidation, or Sale of Assets..................................           52
Section 5.02.  Successor Corporation Substituted.........................................           52

                                        ARTICLE 6.
                                  DEFAULTS AND REMEDIES

Section 6.01.  Events of Default.........................................................           53
Section 6.02.  Acceleration..............................................................           54
Section 6.03.  Other Remedies............................................................           55
Section 6.04.  Waiver of Past Defaults...................................................           55
Section 6.05.  Control by Majority.......................................................           55
Section 6.06.  Limitation on Suits.......................................................           56
Section 6.07.  Rights of Holders of Notes to Receive Payment.............................           56
Section 6.08.  Collection Suit by Trustee................................................           56
Section 6.09.  Trustee May File Proofs of Claim..........................................           56
Section 6.10.  Priorities................................................................           57
Section 6.11.  Undertaking for Costs.....................................................           57

                                        ARTICLE 7.
                                         TRUSTEE

Section 7.01.  Duties of Trustee.........................................................           57
Section 7.02.  Rights of Trustee.........................................................           58
Section 7.03.  Individual Rights of Trustee..............................................           59
Section 7.04.  Trustee's Disclaimer......................................................           59
Section 7.05.  Notice of Defaults........................................................           59
Section 7.06.  Reports by Trustee to Holders of the Notes................................           59
Section 7.07.  Compensation and Indemnity.................................................           60
Section 7.08.  Replacement of Trustee....................................................           60
Section 7.09.  Successor Trustee by Merger, etc..........................................           61
Section 7.10.  Eligibility; Disqualification.............................................           61
Section 7.11.  Preferential Collection of Claims Against Company.........................           62

                                        ARTICLE 8.
                         LEGAL DEFEASANCE AND COVENANT DEFEASANCE

Section 8.01.  Option to Effect Legal Defeasance or Covenant Defeasance..................           62
Section 8.02.  Legal Defeasance and Discharge............................................           62
Section 8.03.  Covenant Defeasance.......................................................           62
Section 8.04.  Conditions to Legal or Covenant Defeasance................................           63
</TABLE>

                                      ii
<PAGE>

<TABLE>
<S>                                                                                            <C>
Section 8.05.  Deposited Money and Government Securities to be Held in Trust;
               Other Miscellaneous Provisions.......................................           64
Section 8.06.  Repayment to Company.................................................           64
Section 8.07.  Reinstatement........................................................           65

                                     ARTICLE 9.
                          AMENDMENT, SUPPLEMENT AND WAIVER

Section 9.01.  Without Consent of Holders of Notes..................................           65
Section 9.02.  With Consent of Holders of Notes.....................................           66
Section 9.03.  Compliance with Trust Indenture Act..................................           67
Section 9.04.  Revocation and Effect of Consents....................................           67
Section 9.05.  Notation on or Exchange of Notes.....................................           67
Section 9.06.  Trustee to Sign Amendments, etc......................................           67

                                     ARTICLE 10.
                                 SECURITY AGREEMENT

Section 10.01. Security Agreement ..................................................           68
Section 10.02. Recording and Opinions...............................................           68
Section 10.03. Release of Collateral................................................           69
Section 10.04. Certificates of the Company..........................................           69
Section 10.05. Certificates of the Trustee..........................................           69
Section 10.06. Authorization of Actions to Be Taken by the Trustee Under the
               Security Agreement...................................................           69
Section 10.07. Authorization of Receipt of Funds by the Trustee Under the Pledge
               Agreement............................................................           70
Section 10.08. Termination of Security Interest.....................................           70

                                     ARTICLE 11.
                                  PLEDGE AGREEMENT

Section 11.01. Pledge Agreement ....................................................           70
Section 11.02. Recording and Opinions...............................................           71
Section 11.03. Release of Cash Collateral and the Pledge Account....................           71
Section 11.04. Certificates of the Company..........................................           72
Section 11.05. Certificates of the Trustee..........................................           72
Section 11.06. Authorization of Actions to Be Taken by the Trustee Under the
               Pledge Agreement.....................................................           72
Section 11.07. Authorization of Receipt of Funds by the Trustee Under the Pledge
               Agreement............................................................           72
Section 11.08. Termination of Security Interest.....................................           72

                                     ARTICLE 12.
                             SATISFACTION AND DISCHARGE

Section 12.01. Satisfaction and Discharge...........................................           73
Section 12.02. Application of Trust Money...........................................           74

                                     ARTICLE 13.
                                    MISCELLANEOUS

Section 13.01. Trust Indenture Act Controls.........................................           74
Section 13.02. Notices..............................................................           74
Section 13.03. Communication by Holders of Notes with Other Holders of Notes........           75
Section 13.04. Certificate and Opinion as to Conditions Precedent...................           75
</TABLE>

                                      iii
<PAGE>

<TABLE>
<S>                                                                                            <C>
Section 13.05. Statements Required in Certificate or Opinion.........................          76
Section 13.06. Rules by Trustee and Agents...........................................          76
Section 13.07. No Personal Liability of Directors, Officers, Employees and
               Stockholders..........................................................          76
Section 13.08. Governing Law.........................................................          76
Section 13.09. No Adverse Interpretation of Other Agreements.........................          77
Section 13.10. Successors............................................................          77
Section 13.11. Severability..........................................................          77
Section 13.12. Counterpart Originals.................................................          77
Section 13.13. Table of Contents, Headings, etc......................................          77
</TABLE>

                                   EXHIBITS

Exhibit A      FORM OF NOTE
Exhibit B      FORM OF CERTIFICATE OF TRANSFER
Exhibit C      FORM OF CERTIFICATE OF EXCHANGE
Exhibit D      FORM OF CERTIFICATE OF ACQUIRING INSTITUTIONAL ACCREDITED
               INVESTOR
Exhibit E      FORM OF SECURITY AGREEMENT
Exhibit F      FORM OF PLEDGE AGREEMENT

                                      iv
<PAGE>

                                                                       EXHIBIT F

     INDENTURE dated as of March 15, 2000 between XM Satellite Radio Inc., a
Delaware corporation (the "Company"), and United States Trust Company of New
York, as trustee (the "Trustee").

     The Company and the Trustee agree as follows for the benefit of each other
and for the equal and ratable benefit of the Holders of the Company's 14% Senior
Secured Notes due 2010 (the "Notes"):

                                  ARTICLE 1.
                         DEFINITIONS AND INCORPORATION
                                 BY REFERENCE

Section 1.01.  Definitions.

     "144A Global Note" means a global note substantially in the form of Exhibit
A hereto bearing the Global Note Legend and the Private Placement Legend and
deposited with or on behalf of, and registered in the name of, the Depositary or
its nominee that will be issued in a denomination equal to the outstanding
principal amount of the Notes sold in reliance on Rule 144A.

     "Acquired Debt" means, with respect to any specified Person (x)
Indebtedness of any other Person existing at the time such other Person is
merged with or into or became a Subsidiary of such specified Person or (y)
Indebtedness secured by a Lien encumbering any asset acquired by such specified
Person, provided that, in each case, such Indebtedness or Lien, as applicable,
is not incurred in connection with, or in contemplation of, such other Person
merging with or into, or becoming a Subsidiary of, such specified Person.

     "Additional Notes" means additional Notes (other than the Initial Notes)
issued under this Indenture in accordance with Sections 2.02 and 4.09 hereof, as
part of the same series as the Initial Notes.

     "Adjusted Consolidated Operating Cash Flow" means Consolidated Operating
Cash Flow for the latest four fiscal quarters for which consolidated financial
statements of Company are available, taken as a whole. For purposes of
calculating Consolidated Operating Cash Flow for any four fiscal quarter period
for purposes of this definition, (1) all Restricted Subsidiaries of the Company
on the date of the transaction giving rise to the need to calculate Adjusted
Consolidated Operating Cash Flow (the "Transaction Date") shall be deemed to
have been Restricted Subsidiaries at all times during such four fiscal quarter
period and (2) any Unrestricted Subsidiary on the Transaction Date shall be
deemed to have been an Unrestricted Subsidiary at all times during such four
fiscal quarter period.

     In addition, for purposes of calculating Adjusted Consolidated Operating
Cash Flow:

     (1)  acquisitions that have been made by the specified Person or any of its
Restricted Subsidiaries, including through mergers or consolidations and
including any related financing transactions, during the four-quarter reference
period or subsequent to such reference period and on or prior to the calculation
date shall be given pro forma effect as if they had occurred on the first day of
the four-quarter reference period and Adjusted Consolidated Operating Cash Flow
for such reference period shall be calculated on a pro forma basis but without
giving effect to clause (3) of the proviso set forth in the definition of
Consolidated Net Income; and

     (2)  the Consolidated Operating Cash Flow attributable to discontinued
operations, as determined in accordance with GAAP, and operations or businesses
disposed of prior to the calculation date, shall be excluded.

                                      F-1
<PAGE>

     "Affiliate" of any specified Person means any other Person directly or
indirectly controlling or controlled by or under direct or indirect common
control with such specified Person. For purposes of this definition, "control,"
as used with respect to any Person, shall mean the possession, directly or
indirectly, of the power to direct or cause the direction of the management or
policies of such Person, whether through the ownership of voting securities, by
agreement or otherwise; provided that beneficial ownership of 10% or more of the
Voting Stock of a Person shall be deemed to be control. For purposes of this
definition, the terms "controlling," "controlled by" and "under common control
with" shall have correlative meanings.

     "Agent" means any Registrar, Paying Agent or co-registrar.

     "Applicable Procedures" means, with respect to any transfer or exchange of
or for beneficial interests in any Global Note, the rules and procedures of the
Depositary, Euroclear and Cedel that apply to such transfer or exchange.

     "Asset Sale" means:

     (1)  the sale, lease, conveyance or other disposition of any assets;
provided that the sale, conveyance or other disposition of all or substantially
all of the assets of the Company and its Restricted Subsidiaries taken as a
whole will be governed by the provisions of Sections 4.14 and 5.01 of this
Indenture and not by the provisions of Section 4.10 hereof; and

     (2)  the issuance of Equity Interests in any of the Company's Restricted
Subsidiaries or the sale of Equity Interests in any of its Subsidiaries.

     Notwithstanding the preceding, the following items shall not be deemed to
be Asset Sales:

     (1)  any single transaction or series of related transactions that involves
assets having a fair market value or that involve net proceeds of less than $1.0
million;

     (2)  a transfer of assets between or among the Company and its Wholly Owned
Restricted Subsidiaries,

     (3)  an issuance of Equity Interests by a Wholly Owned Restricted
Subsidiary to the Company or to another Wholly Owned Restricted Subsidiary;

     (4)  the sale or lease of equipment, inventory, accounts receivable or
other assets in the ordinary course of business;

     (5)  the sale or other disposition of cash or Cash Equivalents;

     (6)  a Restricted Payment or Permitted Investment that is permitted by
Section 4.07 hereof and

     (7)  any issuance or sale of Equity Interests of an Unrestricted
Subsidiary.

     "Attributable Debt" in respect of a sale and leaseback transaction means,
at the time of determination, the present value of the obligation of the lessee
for net rental payments during the remaining term of the lease included in such
sale and leaseback transaction including any period for which such lease has
been extended or may, at the option of the lessor, be extended. Such present
value

                                       2
<PAGE>

shall be calculated using a discount rate equal to the rate of interest implicit
in such transaction, determined in accordance with GAAP.

     "Bankruptcy Law" means Title 11, U.S. Code or any similar federal or state
law for the relief of debtors.

     "Beneficial Owner" has the meaning assigned to such term in Rule 13d-3 and
Rule 13d-5 under the Exchange Act, except that in calculating the beneficial
ownership of any particular "person" (as that term is used in Section 13(d)(3)
of the Exchange Act), such "person" shall be deemed to have beneficial ownership
of all securities that such "person" has the right to acquire by conversion or
exercise of other securities, whether such right is currently exercisable or is
exercisable only upon the occurrence of a subsequent condition. The terms
"Beneficially Owns" and "Beneficially Owned" shall have a corresponding meaning.

     "Board of Directors" means:

     (1)  with respect to a corporation, the board of directors of the
corporation;

     (2)  with respect to a partnership, the Board of Directors of the general
partner of the partnership; and

     (3)  with respect to any other Person, the board or committee of such
Person serving a similar function.

     "Bond Property" means (1) the Collateral or (2) any license owned by a
Wholly Owned Restricted Subsidiary of the Company that is required in order to
operate an XM Radio Business.

     "Broker-Dealer" has the meaning set forth in the Registration Rights
Agreement.

     "Business Day" means any day other than a Legal Holiday.

     "Capital Lease Obligation" means, at the time any determination thereof is
to be made, the amount of the liability in respect of a capital lease that would
at that time be required to be capitalized on a balance sheet in accordance with
GAAP.

     "Capital Stock" means:

     (1)  in the case of a corporation, corporate stock;

     (2)  in the case of an association or business entity, any and all shares,
interests, participations, rights or other equivalents (however designated) of
corporate stock;

     (3)  in the case of a partnership or limited liability company, partnership
or membership interests (whether general or limited); and

     (4)  any other interest or participation that confers on a Person the right
to receive a share of the profits and losses of, or distributions of assets of,
the issuing Person.

     "Cash Collateral" means any assets of the Company defined as Cash
Collateral in the Pledge Agreement.

                                       3
<PAGE>

     "Cash Equivalents" means:

     (1)  United States dollars;

     (2)  securities issued or directly and fully guaranteed or insured by the
United States government or any agency or instrumentality thereof (provided that
the full faith and credit of the United States is pledged in support thereof)
having maturities of not more than six months from the date of acquisition;

     (3)  certificates of deposit and eurodollar time deposits with maturities
of six months or less from the date of acquisition, bankers' acceptances with
maturities not exceeding six months and overnight bank deposits, in each case,
with any domestic commercial bank having capital and surplus in excess of $500.0
million;

     (4)  repurchase obligations with a term of not more than seven days for
underlying securities of the types described in clauses (2) and (3) above
entered into with any financial institution meeting the qualifications specified
in clause (3) above;

     (5)  commercial paper having one of the two highest ratings obtainable from
Moody's Investors Service, Inc. or Standard & Poor's Rating Services and in each
case maturing within six months after the date of acquisition; and

     (6)  money market funds at least 95% of the assets of which constitute Cash
Equivalents of the kinds described in clauses (1) through (5) of this
definition.

     "Change of Control" means the occurrence of any of the following:

     (1)  the direct or indirect sale, transfer, conveyance or other disposition
(other than by way of merger or consolidation), in one or a series of related
transactions, of all or substantially all of the properties or assets of the
Company and its Restricted Subsidiaries taken as a whole to any "person" (as
that term is used in Section 13(d)(3) of the Exchange Act) other than a
Principal or a Related Party of a Principal;

     (2)  the adoption of a plan relating to the liquidation or dissolution of
the Company;

     (3)  the consummation of any transaction (including, without limitation,
any merger or consolidation) the result of which is that any "person" (as
defined above), other than the Principals and their Related Parties, becomes the
Beneficial Owner, directly or indirectly, of more than 50% of the Voting Stock
of Holdings or the Company, measured by voting power rather than number of
shares;

     (4)  the first day on which a majority of the members of the Board of
Directors of the Company or Holdings are not Continuing Directors; or

     (5)  Holdings or the Company consolidates with, or merges with or into, any
Person, or any Person consolidates with, or merges with or into, Holdings or the
Company, in any such event pursuant to a transaction in which any of the
outstanding Voting Stock of Holdings or the Company, as the case may be, or such
other Person is converted into or exchanged for cash, securities or other
property, other than any such transaction where the Voting Stock of Holdings or
the Company, as the case may be, outstanding immediately prior to such
transaction is converted into or exchanged for Voting Stock (other than
Disqualified Stock) of the surviving or transferee Person constituting a
majority of the outstanding

                                       4
<PAGE>

shares of such Voting Stock of such surviving or transferee Person (immediately
after giving effect to such issuance); or

     (6)  the first day on which the Company ceases to be a Wholly Owned
Restricted Subsidiary of Holdings.

     "Collateral" has the meaning assigned to it in the Security Agreement.

     "Collateral Agent" means U.S. Trust Company of New York.

     "Collateral Securities Intermediary" means United States Trust Company of
New York.

     "Commercial Operations Commencement Date" means the first date on which the
Company begins providing the XM Radio Service to third party subscribers that
have paid for such service.

     "Company" means XM Satellite Radio Inc. and any and all successors thereto.

     "Consolidated Net Income" means, with respect to any specified Person for
any period, the aggregate of the Net Income of such Person and its Restricted
Subsidiaries for such period, on a consolidated basis, determined in accordance
with GAAP; provided that:

     (1)  the Net Income (but not loss) of any Person that is not a Restricted
Subsidiary or that is accounted for by the equity method of accounting shall be
included only to the extent of the amount of dividends or distributions paid in
cash to the specified Person or a Wholly Owned Restricted Subsidiary thereof;

     (2)  the Net Income of any Restricted Subsidiary shall be excluded to the
extent that the declaration or payment of dividends or similar distributions by
that Restricted Subsidiary of that Net Income is not at the date of
determination permitted without any prior governmental approval (that has not
been obtained) or, directly or indirectly, by operation of the terms of its
charter or any agreement, instrument, judgment, decree, order, statute, rule or
governmental regulation applicable to that Restricted Subsidiary or its
stockholders;

     (3)  the Net Income of any Person acquired in a pooling of interests
transaction for any period prior to the date of such acquisition shall be
excluded; and

     (4)  the cumulative effect of a change in accounting principles shall be
excluded.

     "Consolidated Net Worth" means, with respect to any specified Person as of
any date, the sum of:

     (1)  the consolidated equity of the common stockholders of such Person and
its consolidated Restricted Subsidiaries as of such date; plus

     (2)  the respective amounts reported on such Person's balance sheet as of
such date with respect to any series of preferred stock (other than Disqualified
Stock) that by its terms is not entitled to the payment of dividends unless such
dividends may be declared and paid only out of net earnings in respect of the
year of such declaration and payment, but only to the extent of any cash
received by such Person upon issuance of such preferred stock.

                                       5
<PAGE>

     "Consolidated Operating Cash Flow" means, with respect to any specified
Person for any period, the Consolidated Net Income of such Person for such
period plus:

     (1)  an amount equal to any extraordinary loss plus any net loss realized
by such Person or any of its Restricted Subsidiaries in connection with an Asset
Sale, to the extent such losses were deducted in computing such Consolidated Net
Income; plus

     (2)  provision for taxes based on income or profits of such Person and its
Restricted Subsidiaries for such period, to the extent that such provision for
taxes was deducted in computing such Consolidated Net Income; plus

     (3)  consolidated interest expense of such Person and its Restricted
Subsidiaries for such period, whether paid or accrued and whether or not
capitalized (including, without limitation, amortization of debt issuance costs
and original issue discount, non-cash interest payments, the interest component
of any deferred payment obligations, the interest component of all payments
associated with Capital Lease Obligations and Attributable Debt, commissions,
discounts and other fees and charges incurred in respect of letter of credit or
bankers' acceptance financings, and net of the effect of all payments made or
received pursuant to Hedging Obligations), to the extent that any such expense
was deducted in computing such Consolidated Net Income; plus

     (4)  depreciation, amortization (including amortization of goodwill and
other intangibles but excluding amortization of prepaid cash expenses that were
paid in a prior period) and other non-cash expenses (excluding any such non-cash
expense to the extent that it represents an accrual of or reserve for cash
expenses in any future period or amortization of a prepaid cash expense that was
paid in a prior period) of such Person and its Restricted Subsidiaries for such
period to the extent that such depreciation, amortization and other non-cash
expenses were deducted in computing such Consolidated Net Income; minus

     (5)  non-cash items increasing such Consolidated Net Income for such
period, other than the accrual of revenue in the ordinary course of business, in
each case, on a consolidated basis and determined in accordance with GAAP.

     Notwithstanding the preceding, the provision for taxes based on the income
or profits of, and the depreciation and amortization and other non-cash expenses
of, a Restricted Subsidiary of the Company shall be added to Consolidated Net
Income to compute Consolidated Operating Cash Flow of the Company only to the
extent that a corresponding amount would be permitted at the date of
determination to be dividended to the Company by such Restricted Subsidiary
without prior governmental approval (that has not been obtained), and without
direct or indirect restriction pursuant to the terms of its charter and all
agreements, instruments, judgments, decrees, orders, statutes, rules and
governmental regulations applicable to that Restricted Subsidiary or its
stockholders.

     "Continuing Directors" means, as of any date of determination, any member
of the Board of Directors of the Company who:

     (1)  was a member of such Board of Directors on the date hereof; or

     (2)  was nominated for election or elected to such Board of Directors with
the approval of a majority of the Continuing Directors who were members of such
Board at the time of such nomination or election.

                                       6
<PAGE>

     "Core XM Radio Assets" means XM Radio Assets reasonably necessary to
operate the XM Radio Business.

     "Corporate Trust Office of the Trustee" shall be at the address of the
Trustee specified in Section 11.02 hereof or such other address as to which the
Trustee may give notice to the Company.

     "Cumulative Available Cash Flow" means, as at any date of determination,
the positive cumulative Consolidated Operating Cash Flow realized during the
period commencing on the beginning of the first fiscal quarter following the
date hereof and ending on the last day of the most recent fiscal quarter
immediately preceding the date of determination for which consolidated financial
information of the Company is available or, if such cumulative Consolidated
Operating Cash Flow for such period is negative, the negative amount by which
cumulative Consolidated Operating Cash Flow is less than zero.

     "Custodian" means the Trustee, as custodian with respect to the Notes in
global form, or any successor entity thereto.

     "Default" means any event that is, or with the passage of time or the
giving of notice or both would be, an Event of Default.

     "Definitive Note" means a certificated Note registered in the name of the
Holder thereof and issued in accordance with Section 2.06 hereof, substantially
in the form of Exhibit A hereto except that such Note shall not bear the Global
Note Legend and shall not have the "Schedule of Exchanges of Interests in the
Global Note" attached thereto.

     "Depositary" means, with respect to the Notes issuable or issued in whole
or in part in global form, the Person specified in Section 2.03 hereof as the
Depositary with respect to the Notes, and any and all successors thereto
appointed as depositary hereunder and having become such pursuant to the
applicable provision of this Indenture.

     "Disqualified Stock" means any Capital Stock that, by its terms (or by the
terms of any security into which it is convertible, or for which it is
exchangeable, in each case at the option of the holder thereof), or upon the
happening of any event, matures or is mandatorily redeemable, pursuant to a
sinking fund obligation or otherwise, or redeemable at the option of the holder
thereof, in whole or in part, on or prior to the date that is 91 days after the
date on which the Notes mature. Notwithstanding the preceding sentence, any
Capital Stock that would constitute Disqualified Stock solely because the
holders thereof have the right to require the Company to repurchase such Capital
Stock upon the occurrence of a change of control or an asset sale shall not
constitute Disqualified Stock if the terms of such Capital Stock provide that
the Company may not repurchase or redeem any such Capital Stock pursuant to such
provisions unless such repurchase or redemption complies with the Section 4.07
of this Indenture.

     "Domestic Subsidiary" means any Restricted Subsidiary that was formed under
the laws of the United States or any state thereof or the District of Columbia.

     "Equity Interests" means Capital Stock and all warrants, options or other
rights to acquire Capital Stock (but excluding any debt security that is
convertible into, or exchangeable for, Capital Stock).

     "Exchange Act" means the Securities Exchange Act of 1934, as amended.

     "Exchange Notes" means the Notes issued in the Exchange Offer pursuant to
Section 2.06(f) hereof.

                                       7
<PAGE>

     "Exchange Offer" has the meaning set forth in the Registration Rights
Agreement.

     "Exchange Offer Registration Statement" has the meaning set forth in the
Registration Rights Agreement.

     "Existing Indebtedness" means Indebtedness of the Company and its
Restricted Subsidiaries in existence on the date hereof , until such amounts are
repaid.

     "FCC License Subsidiary" means XM Radio Inc., a wholly owned subsidiary of
the Company that owns all of the Company's FCC licenses to provide satellite
digital radio service in the United States.

     "GAAP" means generally accepted accounting principles set forth in the
opinions and pronouncements of the Accounting Principles Board of the American
Institute of Certified Public Accountants and statements and pronouncements of
the Financial Accounting Standards Board or in such other statements by such
other entity as have been approved by a significant segment of the accounting
profession, which are in effect from time to time.

     "Global Notes" means, individually and collectively, each of the Restricted
Global Notes and the Unrestricted Global Notes, substantially in the form of
Exhibit A hereto issued in accordance with Section 2.01, 2.06(b)(iv),
2.06(d)(ii) or 2.06(f) hereof.

     "Global Note Legend" means the legend set forth in Section 2.06(g)(ii),
which is required to be placed on all Global Notes issued under this Indenture.

     "Government Securities" means direct obligations of, or obligations
guaranteed by, the United States of America, and the payment for which the
United States pledges its full faith and credit.

     "Guarantee" means a guarantee other than by endorsement of negotiable
instruments for collection in the ordinary course of business, direct or
indirect, in any manner including, without limitation, by way of a pledge of
assets or through letters of credit or reimbursement agreements in respect
thereof, of all or any part of any Indebtedness.

     "Hedging Obligations" means, with respect to any specified Person, the
obligations of such Person under:

     (1)  interest rate swap agreements, interest rate cap agreements and
interest rate collar agreements; and

     (2)  other agreements or arrangements designed to protect such Person
against fluctuations in interest rates or currency values.

     "Holder" means a Person in whose name a Note is registered.

     "Holdings" means XM Satellite Radio Holdings Inc.

     "Hughes Repeater Contract" means the Contract for the Design, Development
and Purchase of Terrestrial Repeater Equipment by and between the Company and
Hughes Electronics Corporation, dated February 14, 2000 as amended from time to
time provided that such amendments, taken as a whole, shall not be materially
adverse to the Company.

                                       8
<PAGE>

     "Hughes Repeater Escrow Agreement" means the agreement between the Company
and Hughes Electronics Corporation, dated as of March 2, 2000, providing for the
escrow of funds payable under the Hughes Repeater Contract.

     "Hughes Satellite Agreement" means the Satellite Purchase Agreement between
the Company and Hughes Space and Communications Inc., dated July 21, 1999, as in
effect on the date hereof and as it may be amended from time to time in any
respect other than with respect to the terms or scope of the security interest
granted by the Company thereunder.

     "Indebtedness" means, with respect to any specified Person, any
indebtedness of such Person, whether or not contingent, in respect of:

     (1)  borrowed money;

     (2)  evidenced by bonds, notes, debentures or similar instruments or
letters of credit (or reimbursement agreements in respect thereof);

     (3)  banker's acceptances;

     (4)  representing Capital Lease Obligations;

     (5)  the balance deferred and unpaid of the purchase price of any property,
except any such balance that constitutes an accrued expense or trade payable; or

     (6)  representing any Hedging Obligations,

     if and to the extent any of the preceding items (other than letters of
credit and Hedging Obligations) would appear as a liability upon a balance sheet
of the specified Person prepared in accordance with GAAP. In addition, the term
"Indebtedness" shall include (a) all Indebtedness of others secured by a Lien on
any asset of the specified Person (whether or not such Indebtedness is assumed
by the specified Person), (b) to the extent not otherwise included, the
Guarantee by the specified Person of any indebtedness of any other Person and
(c) all Attributable Debt of such Person.

     The amount of any Indebtedness outstanding as of any date shall be:

     (1)  the accreted value thereof, in the case of any Indebtedness issued
with original issue discount; and

     (2)  the principal amount thereof, together with any interest thereon that
is more than 30 days past due, in the case of any other Indebtedness.

     "Indenture" means this Indenture, as amended or supplemented from time to
time.

     "Indirect Participant" means a Person who holds a beneficial interest in a
Global Note through a Participant.

     "Initial Notes" means the first $325,000,000.00 aggregate principal amount
of Notes issued under this Indenture on the date hereof.

     "Institutional Accredited Investor" means an institution that is an
"accredited investor" as defined in Rule 501(a)(1), (2), (3) or (7) under the
Securities Act, who are not also QIBs.

                                       9
<PAGE>

     "Investments" means, with respect to any Person, all direct or indirect
investments by such Person in other Persons (including Affiliates) in the form
of loans (including Guarantees or other obligations), advances or capital
contributions (excluding commission, travel and similar advances to officers,
directors and employees made in the ordinary course of business), purchases or
other acquisitions for consideration of Indebtedness, Equity Interests or other
securities, together with all items that are or would be classified as
investments on a balance sheet prepared in accordance with GAAP. If the Company
or any Restricted Subsidiary of the Company sells or otherwise disposes of any
Equity Interests of any direct or indirect Restricted Subsidiary of the Company
such that, after giving effect to any such sale or disposition, such Person is
no longer a Restricted Subsidiary of the Company, the Company shall be deemed to
have made an Investment on the date of any such sale or disposition equal to the
fair market value of the Equity Interests of such Restricted Subsidiary not sold
or disposed of in an amount determined as provided in the final paragraph of
Section 4.07 hereof.  The acquisition by the Company or any Restricted
Subsidiary of the Company of a Person that holds an Investment in a third Person
shall be deemed to be an Investment by the Company or such Restricted Subsidiary
in such third Person in an amount equal to the fair market value of the
Investment held by the acquired Person in such third Person determined as
provided in the final paragraph of Section 4.07 hereof.

     "Legal Holiday" means a Saturday, a Sunday or a day on which banking
institutions in the City of New York or at a place of payment are authorized by
law, regulation or executive order to remain closed.  If a payment date is a
Legal Holiday at a place of payment, payment may be made at that place on the
next succeeding day that is not a Legal Holiday, and no interest shall accrue on
such payment for the intervening period.

     "Letter of Transmittal" means the letter of transmittal to be prepared by
the Company and sent to all Holders of the Notes for use by such Holders in
connection with the Exchange Offer.

     "Lien" means, with respect to any asset, any mortgage, lien, pledge,
charge, security interest or encumbrance of any kind in respect of such asset,
whether or not filed, recorded or otherwise perfected under applicable law,
including any conditional sale or other title retention agreement, any lease in
the nature thereof, any option or other agreement to sell or give a security
interest in and any filing of or agreement to give any financing statement under
the Uniform Commercial Code (or equivalent statutes) of any jurisdiction.

     "Liquidated Damages" means all liquidated damages then owing pursuant to
Section 5 of the Registration Rights Agreement.

     "Net Income" means, with respect to any specified Person, the net income
(loss) of such Person and its Restricted Subsidiaries, determined in accordance
with GAAP and before any reduction in respect of preferred stock dividends,
excluding, however:

     (1)  any gain or loss, together with any related provision for taxes on
such gain or loss, realized in connection with: (a) any Asset Sale; or (b) the
disposition of any securities by such Person or any of its Restricted
Subsidiaries or the extinguishment of any Indebtedness of such Person or any of
its Restricted Subsidiaries; and

     (2)  any extraordinary gain or loss, together with any related provision
for taxes on such extraordinary gain or loss.

     "Net Proceeds" means the aggregate cash proceeds received by the Company or
any of its Restricted Subsidiaries in respect of any Asset Sale (including,
without limitation, any cash received upon the sale or other disposition of any
non-cash consideration received in any Asset Sale), net of the direct

                                       10
<PAGE>

costs relating to such Asset Sale, including, without limitation, legal,
accounting and investment banking fees, and sales commissions, and any
relocation expenses incurred as a result thereof, taxes paid or payable as a
result thereof, in each case, after taking into account any available tax
credits or deductions and any tax sharing arrangements, and amounts required to
be applied to the repayment of Indebtedness secured by a Lien on the asset or
assets that were the subject of such Asset Sale and any reserve for adjustment
in respect of the sale price of such asset or assets established in accordance
with GAAP.

     "Non-Recourse Debt" means Indebtedness:

     (1)  as to which neither the Company nor any of its Restricted Subsidiaries
(a) provides credit support of any kind (including any undertaking, agreement or
instrument that would constitute Indebtedness) or (b) is directly or indirectly
liable as a guarantor or otherwise;

     (2)  no default with respect to which (including any rights that the
holders thereof may have to take enforcement action against an Unrestricted
Subsidiary) would permit upon notice, lapse of time or both any holder of any
other Indebtedness of the Company or any of its Restricted Subsidiaries to
declare a default on such other Indebtedness or cause the payment thereof to be
accelerated or payable prior to its stated maturity; and

     (3)  as to which the definitive documentation therefor specifies that the
lenders thereunder will not have any recourse to the stock or assets of the
Company or any of its Restricted Subsidiaries.

     "Non-U.S. Person" means a Person who is not a U.S. Person.

     "Notes" means any of the securities, as defined in the first paragraph of
the recitals hereof, that are authenticated and delivered under this Indenture.
For all purposes of this Indenture, the term "Notes" shall include the Notes
initially issued on the date hereof, any Exchange Notes to be issued and
exchanged for any Notes pursuant to the Registration Rights Agreement and this
Indenture and any other Notes issued after the date hereof under this Indenture.
For purposes of this Indenture, all Notes shall vote together as one series of
Notes under this Indenture.

     "Obligations" means any principal, interest, penalties, fees,
indemnifications, reimbursements, damages and other liabilities payable under
the documentation governing any Indebtedness.

     "Officer" means, with respect to any Person, the Chairman of the Board, the
Chief Executive Officer, the President, the Chief Operating Officer, the Chief
Financial Officer, the Treasurer, any Assistant Treasurer, the Controller, the
Secretary or any Vice-President of such Person.

     "Officers' Certificate" means a certificate signed on behalf of the Company
by two Officers of the Company, one of whom must be the principal executive
officer, the principal financial officer, the treasurer or the principal
accounting officer of the Company, that meets the requirements of Section 12.05
hereof.

     "Opinion of Counsel" means an opinion from legal counsel who is reasonably
acceptable to the Trustee, that meets the requirements of Section 13.05 hereof.
The counsel may be an employee of or counsel to the Company, any Subsidiary of
the Company or the Trustee.

     "Pari Passu Indebtedness" means Indebtedness of the Company that is pari
passu in right of payment to the Notes.

                                       11
<PAGE>

     "Participant" means, with respect to the Depositary, Euroclear or Cedel, a
Person who has an account with the Depositary, Euroclear or Cedel, respectively
(and, with respect to DTC, shall include Euroclear and Cedel).

     "Permitted Business" means any of the lines of business conducted by the
Company and its Restricted Subsidiaries on the date hereof and any business
similar, ancillary or related thereto or that constitutes a reasonable extension
or expansion thereof, including in connection with the Company's existing and
future technology, trademarks and patents.

     "Permitted Investments" means:

     (1)  any Investment in the Company or in a Wholly Owned Restricted
Subsidiary of the Company;

     (2)  any Investment in Cash Equivalents;

     (3)  any Investment by the Company or any Restricted Subsidiary of the
Company in a Person, if as a result of such Investment:

     (a)  such Person becomes a Wholly Owned Restricted Subsidiary of the
Company; or

     (b)  such Person is merged, consolidated or amalgamated with or into, or
transfers or conveys substantially all of its assets to, or is liquidated into,
the Company or a Wholly Owned Restricted Subsidiary of the Company;

     (4)  any Investment made as a result of the receipt of non-cash
consideration from an Asset Sale that was made pursuant to and in compliance
with Section 4.10;

     (5)  any acquisition of assets solely in exchange for the issuance of
Equity Interests (other than Disqualified Stock) of the Company;

     (6)  Hedging Obligations;

     (7)  Investments in existence on the date hereof and modifications thereof;

     (8)  Investments in securities of trade creditors or customers received in
compromise of obligations of such Person incurred in the ordinary course of
business, including under any plan of reorganization or similar arrangement upon
the bankruptcy or insolvency of such Person;

     (9)  loans and advances to officers, directors and employees of the Company
or any of its Restricted Subsidiaries in the ordinary course of business not to
exceed $2.0 million at any time outstanding;

     (10) Investments indirectly acquired by the Company or any of its
Restricted Subsidiaries through a direct Investment in another Person made in
compliance with this Indenture, provided that such Investments existed prior to
and were not made in contemplation of such acquisition;

     (11) Investments in a joint venture with Sirius Satellite Radio, Inc., or
an affiliate thereof, the proceeds of which investments are used solely to
develop interoperable radio technology capable of receiving and processing radio
system signals broadcast by both the Company and Sirius Satellite Radio Inc.,
for the licensing of other satellite radio technology from the Company and
Sirius Satellite Radio, Inc.

                                       12
<PAGE>

in connection therewith and for activities reasonably ancillary thereto in
accordance with the Joint Development Agreement between the Company and Sirius
Satellite Radio, Inc., as in effect on the date hereof or as it may be amended
in a manner not materially adverse to the Company; and

     (12) other Investments in any Person having an aggregate fair market value
(measured on the date each such Investment was made and without giving effect to
subsequent changes in value), when taken together with all other Investments
made pursuant to this clause (12) since the date hereof that are at the time
outstanding not to exceed $10.0 million.

     "Permitted Liens" means:

     (1)  Liens on the Bond Property or any other assets of the Company or its
Restricted Subsidiaries securing Pari Passu Indebtedness incurred pursuant to
clause (1) of Section 4.09 hereof or Permitted Refinancing Indebtedness in
respect thereof; provided, that the Notes shall be equally and ratably secured
by such Bond Property or other assets;

     (2)  Liens in favor of the Company;

     (3)  Liens on property, or on shares of stock or Indebtedness, of a Person
existing at the time such Person is merged with or into or consolidated with the
Company or any Restricted Subsidiary of the Company; provided that such Liens
were in existence prior to the contemplation of such merger or consolidation and
do not extend to any assets other than those of the Person merged into or
consolidated with the Company or the Restricted Subsidiary;

     (4)  Liens on property (other than Bond Property) existing at the time of
acquisition thereof by the Company or any Restricted Subsidiary of the Company,
provided that such Liens were not incurred in contemplation of such acquisition;

     (5)  Liens to secure the performance of bids, tenders, leases, statutory
obligations, surety or appeal bonds, performance bonds or other obligations of a
like nature incurred in the ordinary course of business;

     (6)  Liens to secure Indebtedness (including Capital Lease Obligations)
permitted by clause (6) of the second paragraph of Section 4.09 hereof covering
only the assets acquired with such Indebtedness (other than Bond Property);

     (7)  Liens existing on the date hereof including Liens arising hereunder in
favor of the Trustee and including Liens under the Hughes Repeater Escrow
Agreement;

     (8)  Liens for taxes, assessments or governmental charges or claims that
are not yet delinquent or that are being contested in good faith by appropriate
proceedings promptly instituted and diligently concluded, provided that any
reserve or other appropriate provision as shall be required in conformity with
GAAP shall have been made therefor;

     (9)  Liens securing the Notes;

     (10) Liens which do not attach to the Bond Property incidental to the
conduct of the Company's or a Restricted Subsidiary's business or the ownership
of its property and assets not securing Indebtedness, and which do not in the
aggregate materially detract from the value of the assets or property of the
Company and its Restricted Subsidiaries taken as a whole, or materially impair
the use hereof in the operation of its business;

                                       13
<PAGE>

     (11)  Liens incurred or deposits made in the ordinary course of business in
connection with workers' compensation, unemployment insurance and other types of
social security;

     (12)  judgment Liens which do not attach to the Bond Property not giving
rise to an Event of Default;

     (13)  easements, rights-of-way, zoning restrictions and other similar
charges or encumbrances in respect of real property not interfering in any
material respect with the ordinary conduct of the business of the Company or any
of its Restricted Subsidiaries;

     (14)  any interest or title of a lessor under any Capitalized Lease
Obligation;

     (15)  leases or subleases granted to others that do not materially
interfere with the ordinary course of business of the Company and its Restricted
Subsidiaries;

     (16)  Liens arising from filing Uniform Commercial Code financing
statements regarding leases;

     (17)  Liens in favor of customs and revenue authorities arising as a mater
of law to secure payment of customer duties in connection with the importation
of goods;

     (18)  carriers', warehousemen's, mechanics', landlords', materialmen's,
repairmen's or other similar Liens arising in the ordinary course of business
that are not delinquent or remain payable without penalty;

     (19)  Liens which do not attach to the Bond Property securing Hedging
Obligations which Hedging Obligations relate to Indebtedness that is otherwise
permitted under this Indenture;

     (20)  Liens encumbering property or other assets under construction in the
ordinary course of business arising from progress or partial payments by a
customer of the Company or its Restricted Subsidiaries relating to such property
or other assets;

     (21)  Liens arising out of conditional sale, title retention, consignment
or similar arrangements for the sale of goods entered into by the Company or any
of its Restricted Subsidiaries in the ordinary course of business;

     (22)  Liens on the Company's interests in satellites and its terrestrial
repeater network subject to purchase under the Hughes Satellite Agreement and
the Hughes Repeater Contract, respectively;

     (23)  Liens incurred in the ordinary course of business of the Company or
any Restricted Subsidiary with respect to obligations that do not exceed $10.0
million at any one time outstanding; and

     (24)  Liens on Qualified Receivables securing Indebtedness permitted by
clause (xii) of the second paragraph of Section 4.09 hereof.

     "Permitted Refinancing Indebtedness" means any Indebtedness of the Company
or any of its Restricted Subsidiaries issued in exchange for, or the net
proceeds of which are used to extend, refinance, renew, replace, defease or
refund other Indebtedness of the Company or any of its Restricted Subsidiaries
(other than intercompany Indebtedness); provided that:

                                       14
<PAGE>

     (1)  the principal amount (or accreted value, if applicable) of such
Permitted Refinancing Indebtedness does not exceed the principal amount (or
accreted value, if applicable) of the Indebtedness so extended, refinanced,
renewed, replaced, defeased or refunded (plus all accrued interest thereon and
the amount of all expenses, consent fees and premiums incurred in connection
therewith);

     (2)  (A) if such Permitted Refinancing Indebtedness has a Weighted Average
Life to Maturity shorter than that of the Notes or a final maturity date earlier
than the final maturity date of the Notes, such Permitted Refinancing
Indebtedness shall have a Weighted Average Life to Maturity no shorter than the
remaining Weighted Average Life to Maturity of the debt so extended, refinanced,
renewed, replaced, defeased or refunded and a final Stated Maturity no earlier
than the final maturity date of the debt so extended, refinanced, renewed,
replaced, defeased or refunded or (B) in all other cases, such Permitted
Refinancing Indebtedness shall have a final maturity date later than the final
maturity date of, and shall have a Weighted Average Life to Maturity equal to or
greater than the Weighted Average Life to Maturity of, the Notes;

     (3)  if the Indebtedness being extended, refinanced, renewed, replaced,
defeased or refunded is subordinated in right of payment to the Notes, such
Permitted Refinancing Indebtedness is subordinated in right of payment to, the
Notes on terms at least as favorable to the Holders of Notes as those contained
in the documentation governing the Indebtedness being extended, refinanced,
renewed, replaced, defeased or refunded; and

     (4)  such Indebtedness is incurred either by the Company or by the
Restricted Subsidiary who is the obligor on the Indebtedness being extended,
refinanced, renewed, replaced, defeased or refunded.

     "Person" means any individual, corporation, partnership, joint venture,
association, joint-stock company, trust, unincorporated organization, limited
liability company or government or other entity.

     "Pledge Agreement" means the agreement, dated March 15, 2000, between the
Company and the Trustee, governing the pledge of the Pledge Account.

     "Principals" means American Mobile Satellite Corporation, General Motors
Corporation, DIRECTV Enterprises, Inc. and Clear Channel Investments, Inc.

     "Private Placement Legend" means the legend set forth in Section 2.06(g)(i)
to be placed on all Notes issued under this Indenture except where otherwise
permitted by the provisions of this Indenture.

     "QIB" means a "qualified institutional buyer" as defined in Rule 144A.

     "Qualified Receivables" means the aggregate amount of accounts receivables
of the Company determined in accordance with GAAP that are not more than 90 days
past due.

     "Registration Rights Agreement" means the Registration Rights Agreement,
dated as of March 15, 2000, by and among the Company and the other parties named
on the signature pages thereof, as such agreement may be amended, modified or
supplemented from time to time and, with respect to any Additional Notes, one or
more registration rights agreements between the Company and the other parties
thereto, as such agreement(s) may be amended, modified or supplemented from time
to time, relating to rights given by the Company to the purchasers of Additional
Notes to register such Additional Notes under the Securities Act."

                                       15
<PAGE>

     "Related Party" means:

     (1) any controlling stockholder, 80% (or more) owned Subsidiary, or
immediate family member (in the case of an individual) of any Principal; or

     (2)  any trust, corporation, partnership or other entity, the
beneficiaries, stockholders, partners, owners or Persons beneficially holding an
80% or more controlling interest of which consist of any one or more Principals
and/or such other Persons referred to in the immediately preceding clause (1).

     "Responsible Officer," when used with respect to the Trustee, means any
officer within the Corporate Trust Administration of the Trustee (or any
successor group of the Trustee) or any other officer of the Trustee customarily
performing functions similar to those performed by any of the above designated
officers and also means, with respect to a particular corporate trust matter,
any other officer to whom such matter is referred because of his knowledge of
and familiarity with the particular subject.

     "Restricted Definitive Note" means a Definitive Note bearing the Private
Placement Legend.

     "Restricted Global Note" means a Global Note bearing the Private Placement
Legend.

     "Restricted Investment" means any Investment other than a Permitted
Investment.

     "Restricted Subsidiary" of a Person means any Subsidiary of the referent
Person that is not an Unrestricted Subsidiary.

     "Rule 144" means Rule 144 promulgated under the Securities Act.

     "Rule 144A" means Rule 144A promulgated under the Securities Act.

     "Rule 903" means Rule 903 promulgated under the Securities Act.

     "Rule 904" means Rule 904 promulgated the Securities Act.

     "SEC" means the Securities and Exchange Commission.

     "Securities Act" means the Securities Act of 1933, as amended.

     "Security Agreement" means the agreement, dated March 15, 2000, between the
Company, the FCC License Subsidiary, the Trustee and the Collateral Agent,
defining the terms of the security interests that secure the notes.

     "Separation Date" means the earliest of (i) the commencement of the
Exchange Offer, (ii) the effectiveness of any shelf registration statement with
respect to the Notes and (iii) such date as Bear, Stearns & Co. Inc. and
Donaldson, Lufkin & Jenrette Securities Corporation shall determine.

     "Shelf Registration Statement" means the Shelf Registration Statement as
defined in the Registration Rights Agreement.

     "Significant Subsidiary" means any Subsidiary that would be a "significant
subsidiary" as defined in Article 1, Rule 1-02 of Regulation S-X, promulgated
pursuant to the Securities Act, as such Regulation is in effect on the date
hereof.

                                       16
<PAGE>

     "Stated Maturity" means, with respect to any installment of interest or
principal on any series of Indebtedness, the date on which such payment of
interest or principal was scheduled to be paid in the original documentation
governing such Indebtedness, and shall not include any contingent obligations to
repay, redeem or repurchase any such interest or principal prior to the date
originally scheduled for the payment thereof.

     "Subscriber" means a subscriber in good standing to the XM Radio Service
that has paid subscription fees for at least one month of such service and whose
subscription payments are not delinquent.

     "Subsidiary" means, with respect to any specified Person:

     (1)  any corporation, association or other business entity of which more
than 50% of the total voting power of shares of Capital Stock entitled (without
regard to the occurrence of any contingency) to vote in the election of
directors, managers or trustees thereof is at the time owned or controlled,
directly or indirectly, by such Person or one or more of the other Subsidiaries
of that Person (or a combination thereof); and

     (2)  any partnership (a) the sole general partner or the managing general
partner of which is such Person or a Subsidiary of such Person or (b) the only
general partners of which are such Person or one or more Subsidiaries of such
Person (or any combination thereof).

     "Tax Sharing Agreement" means the tax sharing agreement dated March 15,
2000 between Holdings, the Company and XM Radio Inc., as in effect on the date
hereof.

     "TIA" means the Trust Indenture Act of 1939 (15 U.S.C. (S)(S) 77aaa-77bbbb)
as in effect on the date on which this Indenture is qualified under the TIA.

     "Total Consolidated Indebtedness" means, at any date of determination, an
amount equal to the aggregate amount of all Indebtedness of the Company and the
Restricted Subsidiaries, determined on a consolidated basis in accordance with
GAAP, outstanding as of the date of determination.

     "Total Incremental Equity" means, at any date of determination, the sum of,
without duplication: (1) the aggregate cash proceeds received by the Company
after the Issue Date from the issuance or sale of Capital Stock of the Company
(other than Disqualified Stock but including Capital Stock issued upon the
conversion of convertible Indebtedness or from the exercise of options, warrants
or rights to purchase Capital Stock of the Company other than Disqualified
Stock) to any Person other than a Restricted Subsidiary; plus (2) an amount
equal to the sum of (a) the net reduction in Investments in any Person (other
than Permitted Investments) resulting from the payment in cash of dividends,
repayments of loans or advances or other transfers of assets, in each case to
the Company or any Restricted Subsidiary after the Issue Date from such Person
and (b) the portion (proportionate to the Company's equity interest in such
Restricted Subsidiary) of the fair market value of the net assets of any
Unrestricted Subsidiary at the time such Unrestricted Subsidiary is designated a
Restricted Subsidiary; provided, however, that in the case of (a) or (b) above,
the foregoing sum shall not exceed the amount of Investments previously made
(and treated as a Restricted Payment) by the Company or any Restricted
Subsidiary in such Person or Unrestricted Subsidiary and that constitutes a
Restricted Payment that has been deducted from Total Incremental Equity pursuant
to clause (3) below; minus (3) the aggregate amount of all Restricted Payments
declared or made on or after the Issue Date (including the aggregate amount paid
pursuant to clauses (1), (2), (3), (4), (5), (6) and (8) of the second paragraph
of Section 4.09.

                                       17
<PAGE>

     "Trustee" means the party named as such above until a successor replaces it
in accordance with the applicable provisions of this Indenture and thereafter
means the successor serving hereunder.

     "Unrestricted Global Note" means a permanent global Note substantially in
the form of Exhibit A attached hereto that bears the Global Note Legend and that
has the "Schedule of Exchanges of Interests in the Global Note" attached
thereto, and that is deposited with or on behalf of and registered in the name
of the Depositary, representing a series of Notes that do not bear the Private
Placement Legend.

     "Unrestricted Definitive Note" means one or more Definitive Notes that do
not bear and are not required to bear the Private Placement Legend.

     "Unrestricted Subsidiary" means any Subsidiary of the Company (other than
the FCC License Subsidiary) that is designated by the Board of Directors as an
Unrestricted Subsidiary pursuant to a Board Resolution, but only to the extent
that such Subsidiary:

     (1)  has no Indebtedness other than Non-Recourse Debt;

     (2)  is not party to any agreement, contract, arrangement or understanding
with the Company or any Restricted Subsidiary of the Company unless the terms of
any such agreement, contract, arrangement or understanding are no less favorable
to the Company or such Restricted Subsidiary than those that might be obtained
at the time from Persons who are not Affiliates of the Company;

     (3)  is a Person with respect to which neither the Company nor any of its
Restricted Subsidiaries has any direct or indirect obligation (a) to subscribe
for additional Equity Interests or (b) to maintain or preserve such Person's
financial condition or to cause such Person to achieve any specified levels of
operating results; and

     (4)  has not guaranteed or otherwise directly or indirectly provided credit
support for any Indebtedness of the Company or any of its Restricted
Subsidiaries.

     Any designation of a Subsidiary of the Company as an Unrestricted
Subsidiary shall be evidenced to the Trustee by filing with the Trustee a
certified copy of the Board Resolution giving effect to such designation and an
Officers' Certificate certifying that such designation complied with the
preceding conditions and was permitted by Section 4.07 hereof. If, at any time,
any Unrestricted Subsidiary would fail to meet the preceding requirements as an
Unrestricted Subsidiary, it shall thereafter cease to be an Unrestricted
Subsidiary for purposes of this Indenture and any Indebtedness of such
Subsidiary shall be deemed to be incurred by a Restricted Subsidiary of the
Company as of such date and, if such Indebtedness is not permitted to be
incurred as of such date under Section 4.09 hereof, the Company shall be in
default of such covenant. The Board of Directors of the Company may at any time
designate any Unrestricted Subsidiary to be a Restricted Subsidiary; provided
that such designation shall be deemed to be an incurrence of Indebtedness by a
Restricted Subsidiary of the Company of any outstanding Indebtedness of such
Unrestricted Subsidiary and such designation shall only be permitted if (1) such
Indebtedness is permitted under Section 4.09, calculated on a pro forma basis as
if such designation had occurred at the beginning of the four-quarter reference
period; and (2) no Default or Event of Default would be in existence following
such designation.

     "U.S. Person" means a U.S. person as defined in Rule 902(o) under the
Securities Act.

     "Voting Stock" of any Person as of any date means the Capital Stock of such
Person that is at the time entitled to vote in the election of the Board of
Directors of such Person.

                                       18
<PAGE>

     "Weighted Average Life to Maturity" means, when applied to any Indebtedness
or Disqualified Stock at any date, the number of years obtained by dividing:

     (1)  the sum of the products obtained by multiplying (a) the amount of each
then remaining installment, sinking fund, serial maturity or other required
payments of principal (or liquidation preference, as applicable), including
payment at final maturity, in respect thereof, by (b) the number of years
(calculated to the nearest one-twelfth) that will elapse between such date and
the making of such payment; by

     (2)  the then outstanding principal amount (or liquidation preference) of
such Indebtedness (or Disqualified Stock, as applicable).

     "Wholly Owned Restricted Subsidiary" of any specified Person means a
Restricted Subsidiary of such Person all of the outstanding Capital Stock or
other ownership interests of which (other than directors' qualifying shares)
shall at the time be owned by such Person or by one or more Wholly Owned
Restricted Subsidiaries of such Person and one or more Wholly Owned Restricted
Subsidiaries of such Person.

     "XM Radio Assets" means all assets, rights, services and properties,
whether tangible or intangible, used or intended for use in connection with an
XM Radio Business, including satellites, terrestrial repeating stations, FCC
licenses, uplink facilities, musical libraries and other recorded programming,
furniture, fixtures and equipment and telemetry, tracking, monitoring and
control equipment.

     "XM Radio Business" means the business of transmitting digital radio
programming throughout the United States by satellite and terrestrial repeating
stations to be received by subscribers, including any business in which the
Company was engaged on the date hereof, and any business reasonably related
thereto.

     "XM Radio Service" means digital radio programming transmitted by
satellites and terrestrial repeating stations to vehicle, home and portable
radios in the United States.

Section 1.02.  Other Definitions.

                                                              Defined in
     Term                                                      Section
     ----                                                      -------

     "Affiliate Transaction"..............................       4.11
     "Asset Sale Offer"...................................       3.09
     "Authentication Order"...............................       2.02
     "Bankruptcy Law".....................................       4.01
     "Change of Control Offer"............................       4.14
     "Change of Control Payment"..........................       4.14
     "Change of Control Payment Date".....................       4.14
     "Covenant Defeasance"................................       8.03
     "Event of Default"...................................       6.01
     "Excess Proceeds"....................................       4.10
     "incur"..............................................       4.09
     "Legal Defeasance"...................................       8.02
     "Offer Amount".......................................       3.09
     "Offer Period".......................................       3.09
     "Paying Agent".......................................       2.03

                                       19
<PAGE>

                                                              Defined in
     Term                                                      Section
     ----                                                      -------

     "Permitted Debt".....................................       4.09
     "Purchase Date"......................................       3.09
     "Registrar"..........................................       2.03
     "Restricted Payments"................................       4.07
     "Unit Legend"........................................       2.06

Section 1.03.  Incorporation by Reference of Trust Indenture Act.

     Whenever this Indenture refers to a provision of the TIA, the provision is
incorporated by reference in and made a part of this Indenture.

     The following TIA terms used in this Indenture have the following meanings:

     "indenture securities" means the Notes;

     "indenture security Holder" means a Holder of a Note;

     "indenture to be qualified" means this Indenture;

     "indenture trustee" or "institutional trustee" means the Trustee; and

     "obligor" on the Notes means the Company and any successor obligor upon the
Notes.

     All other terms used in this Indenture that are defined by the TIA, defined
by TIA reference to another statute or defined by SEC rule under the TIA have
the meanings so assigned to them.

Section 1.04.  Rules of Construction.

     Unless the context otherwise requires:

     (a)  a term has the meaning assigned to it;

     (b)  an accounting term not otherwise defined has the meaning assigned to
it in accordance with GAAP;

     (c)  "or" is not exclusive;

     (d)  words in the singular include the plural, and in the plural include
the singular;

     (e)  provisions apply to successive events and transactions; and

     (f)  references to sections of or rules under the Securities Act shall be
deemed to include substitute, replacement of successor sections or rules adopted
by the SEC from time to time.

                                       20
<PAGE>

                                   ARTICLE 2.
                                   THE NOTES

Section 2.01.  Form and Dating.

     (a)  General. The Notes and the Trustee's certificate of authentication
shall be substantially in the form of Exhibit A hereto. The Notes may have
notations, legends or endorsements required by law, stock exchange rule or
usage. Each Note shall be dated the date of its authentication. The Notes shall
be in denominations of $1,000 and integral multiples thereof except that Notes
used to pay Liquidated Damages may be in other denominations.

     The terms and provisions contained in the Notes shall constitute, and are
hereby expressly made, a part of this Indenture and the Company and the Trustee,
by their execution and delivery of this Indenture, expressly agree to such terms
and provisions and to be bound thereby. However, to the extent any provision of
any Note conflicts with the express provisions of this Indenture, the provisions
of this Indenture shall govern and be controlling.

     (b)  Global Notes. Notes issued in global form shall be substantially in
the form of Exhibit A attached hereto (including the Global Note Legend thereon
and the "Schedule of Exchanges of Interests in the Global Note" attached
thereto). Notes issued in definitive form shall be substantially in the form of
Exhibit A attached hereto (but without the Global Note Legend thereon and
without the "Schedule of Exchanges of Interests in the Global Note" attached
thereto). Each Global Note shall represent such of the outstanding Notes as
shall be specified therein and each shall provide that it shall represent the
aggregate principal amount of outstanding Notes from time to time endorsed
thereon and that the aggregate principal amount of outstanding Notes represented
thereby may from time to time be reduced or increased, as appropriate, to
reflect exchanges and redemptions. Any endorsement of a Global Note to reflect
the amount of any increase or decrease in the aggregate principal amount of
outstanding Notes represented thereby shall be made by the Trustee or the
Custodian, at the direction of the Trustee, in accordance with instructions
given by the Holder thereof as required by Section 2.06 hereof.

Section 2.02.  Execution and Authentication.

     Two Officers shall sign the Notes for the Company by manual or facsimile
signature. The Company's seal shall be reproduced on the Notes and may be in
facsimile form.

     If an Officer whose signature is on a Note no longer holds that office at
the time a Note is authenticated, the Note shall nevertheless be valid.

     A Note shall not be valid until authenticated by the manual signature of
the Trustee.  The signature shall be conclusive evidence that the Note has been
authenticated under this Indenture.

     The Trustee shall, upon a written order of the Company signed by two
Officers (an "Authentication Order"), authenticate Notes for original issue up
to the aggregate principal amount stated in paragraph 4 of the Notes. The
aggregate principal amount of Notes outstanding at any time may not exceed such
amount except as provided in Section 2.07 hereof.

     The Trustee may appoint an authenticating agent acceptable to the Company
to authenticate Notes. An authenticating agent may authenticate Notes whenever
the Trustee may do so. Each reference in this Indenture to authentication by the
Trustee includes authentication by such agent. An authenticating agent has the
same rights as an Agent to deal with Holders or an Affiliate of the Company.

                                       21
<PAGE>

Section 2.03. Registrar and Paying Agent.

     The Company shall maintain an office or agency where Notes may be presented
for registration of transfer or for exchange ("Registrar") and an office or
agency where Notes may be presented for payment ("Paying Agent"). The Registrar
shall keep a register of the Notes and of their transfer and exchange. The
Company may appoint one or more co-registrars and one or more additional paying
agents. The term "Registrar" includes any co-registrar and the term "Paying
Agent" includes any additional paying agent. The Company may change any Paying
Agent or Registrar without notice to any Holder. The Company shall notify the
Trustee in writing of the name and address of any Agent not a party to this
Indenture. If the Company fails to appoint or maintain another entity as
Registrar or Paying Agent, the Trustee shall act as such. The Company or any of
its Subsidiaries may act as Paying Agent or Registrar.

     The Company initially appoints The Depository Trust Company ("DTC") to act
as Depositary with respect to the Global Notes.

     The Company initially appoints the Trustee to act as the Registrar and
Paying Agent and to act as Custodian with respect to the Global Notes.

Section 2.04. Paying Agent to Hold Money in Trust.

     The Company shall require each Paying Agent other than the Trustee to agree
in writing that the Paying Agent will hold in trust for the benefit of Holders
or the Trustee all money held by the Paying Agent for the payment of principal,
premium or Liquidated Damages, if any, or interest on the Notes, and will notify
the Trustee of any default by the Company in making any such payment. While any
such default continues, the Trustee may require a Paying Agent to pay all money
held by it to the Trustee. The Company at any time may require a Paying Agent to
pay all money held by it to the Trustee. Upon payment over to the Trustee, the
Paying Agent (if other than the Company or a Subsidiary) shall have no further
liability for the money. If the Company or a Subsidiary acts as Paying Agent, it
shall segregate and hold in a separate trust fund for the benefit of the Holders
all money held by it as Paying Agent. Upon any bankruptcy or reorganization
proceedings relating to the Company, the Trustee shall serve as Paying Agent for
the Notes.

Section 2.05.  Holder Lists.

     The Trustee shall preserve in as current a form as is reasonably
practicable the most recent list available to it of the names and addresses of
all Holders and shall otherwise comply with TIA (S) 312(a). If the Trustee is
not the Registrar, the Company shall furnish to the Trustee at least seven
Business Days before each interest payment date and at such other times as the
Trustee may request in writing, a list in such form and as of such date as the
Trustee may reasonably require of the names and addresses of the Holders of
Notes and the Company shall otherwise comply with TIA (S) 312(a).

Section 2.06.  Transfer and Exchange.

     (a)       Transfer and Exchange of Global Notes.  A Global Note may not be
transferred as a whole except by the Depositary to a nominee of the Depositary,
by a nominee of the Depositary to the Depositary or to another nominee of the
Depositary, or by the Depositary or any such nominee to a successor Depositary
or a nominee of such successor Depositary. All Global Notes will be exchanged by
the Company for Definitive Notes if (i) the Company delivers to the Trustee
notice from the Depositary that it is unwilling or unable to continue to act as
Depositary or that it is no longer a clearing agency registered under the
Exchange Act and, in either case, a successor Depositary is not appointed by the

                                       22
<PAGE>

Company within 120 days after the date of such notice from the Depositary or
(ii) the Company in its sole discretion determines that the Global Notes (in
whole but not in part) should be exchanged for Definitive Notes and delivers a
written notice to such effect to the Trustee Upon the occurrence of either of
the preceding events in (i) or (ii) above, Definitive Notes shall be issued in
such names as the Depositary shall instruct the Trustee. Global Notes also may
be exchanged or replaced, in whole or in part, as provided in Sections 2.07 and
2.10 hereof. Every Note authenticated and delivered in exchange for, or in lieu
of, a Global Note or any portion thereof, pursuant to this Section 2.06 or
Section 2.07 or 2.10 hereof, shall be authenticated and delivered in the form
of, and shall be, a Global Note. A Global Note may not be exchanged for another
Note other than as provided in this Section 2.06(a), however, beneficial
interests in a Global Note may be transferred and exchanged as provided in
Section 2.06(b), (c) or (f) hereof.

     (b)  Transfer and Exchange of Beneficial Interests in the Global Notes. The
transfer and exchange of beneficial interests in the Global Notes shall be
effected through the Depositary, in accordance with the provisions of this
Indenture and the Applicable Procedures. Beneficial interests in the Restricted
Global Notes shall be subject to restrictions on transfer comparable to those
set forth herein to the extent required by the Securities Act. Transfers of
beneficial interests in the Global Notes also shall require compliance with
either subparagraph (i) or (ii) below, as applicable, as well as one or more of
the other following subparagraphs, as applicable:

          (i)  Transfer of Beneficial Interests in the Same Global Note.
     Beneficial interests in any Restricted Global Note may be transferred to
     Persons who take delivery thereof in the form of a beneficial interest in
     the same Restricted Global Note in accordance with the transfer
     restrictions set forth in the Private Placement Legend. Beneficial
     interests in any Unrestricted Global Note may be transferred to Persons who
     take delivery thereof in the form of a beneficial interest in an
     Unrestricted Global Note. No written orders or instructions shall be
     required to be delivered to the Registrar to effect the transfers described
     in this Section 2.06(b)(i).

          (ii)  All Other Transfers and Exchanges of Beneficial Interests in
     Global Notes. In connection with all transfers and exchanges of beneficial
     interests that are not subject to Section 2.06(b)(i) above, the transferor
     of such beneficial interest must deliver to the Registrar either (A) (1) a
     written order from a Participant or an Indirect Participant given to the
     Depositary in accordance with the Applicable Procedures directing the
     Depositary to credit or cause to be credited a beneficial interest in
     another Global Note in an amount equal to the beneficial interest to be
     transferred or exchanged and (2) instructions given in accordance with the
     Applicable Procedures containing information regarding the Participant
     account to be credited with such increase or (B) (1) a written order from a
     Participant or an Indirect Participant given to the Depositary in
     accordance with the Applicable Procedures directing the Depositary to cause
     to be issued a Definitive Note in an amount equal to the beneficial
     interest to be transferred or exchanged and (2) instructions given by the
     Depositary to the Registrar containing information regarding the Person in
     whose name such Definitive Note shall be registered to effect the transfer
     or exchange referred to in (1) above. Upon consummation of an Exchange
     Offer by the Company in accordance with Section 2.06(f) hereof, the
     requirements of this Section 2.06(b)(ii) shall be deemed to have been
     satisfied upon receipt by the Registrar of the instructions contained in
     the Letter of Transmittal delivered by the Holder of such beneficial
     interests in the Restricted Global Notes. Upon satisfaction of all of the
     requirements for transfer or exchange of beneficial interests in Global
     Notes contained in this Indenture and the Notes or otherwise applicable
     under the Securities Act, the Trustee shall adjust the principal amount of
     the relevant Global Note(s) pursuant to Section 2.06(h) hereof.

          (iii) Transfer of Beneficial Interests to Another Restricted Global
     Note. A beneficial interest in any Restricted Global Note may be
     transferred to a Person who takes delivery thereof

                                       23
<PAGE>

     in the form of a beneficial interest in another Restricted Global Note if
     the transfer complies with the requirements of Section 2.06(b)(ii) above
     and the Registrar receives the following:

               (A)  if the transferee will take delivery in the form of a
          beneficial interest in the 144A Global Note, then the transferor must
          deliver a certificate in the form of Exhibit B hereto, including the
          certifications in item (1) thereof.

          (iv) Transfer and Exchange of Beneficial Interests in a Restricted
     Global Note for Beneficial Interests in the Unrestricted Global Note. A
     beneficial interest in any Restricted Global Note may be exchanged by any
     holder thereof for a beneficial interest in an Unrestricted Global Note or
     transferred to a Person who takes delivery thereof in the form of a
     beneficial interest in an Unrestricted Global Note if the exchange or
     transfer complies with the requirements of Section 2.06(b)(ii) above and:

               (A) such exchange or transfer is effected pursuant to the
          Exchange Offer in accordance with the Registration Rights Agreement
          and the holder of the beneficial interest to be transferred, in the
          case of an exchange, or the transferee, in the case of a transfer,
          certifies in the applicable Letter of Transmittal that it is not (1) a
          broker-dealer, (2) a Person participating in the distribution of the
          Exchange Notes or (3) a Person who is an affiliate (as defined in Rule
          144) of the Company;

               (B)  such transfer is effected pursuant to the Shelf Registration
          Statement in accordance with the Registration Rights Agreement;

               (C)  such transfer is effected by a Broker-Dealer pursuant to the
          Exchange Offer Registration Statement in accordance with the
          Registration Rights Agreement; or

               (D)  the Registrar receives the following:

                    (1)  if the holder of such beneficial interest in a
               Restricted Global Note proposes to exchange such beneficial
               interest for a beneficial interest in an Unrestricted Global
               Note, a certificate from such holder in the form of Exhibit C
               hereto, including the certifications in item (1)(a) thereof; or

                    (2)  if the holder of such beneficial interest in a
               Restricted Global Note proposes to transfer such beneficial
               interest to a Person who shall take delivery thereof in the form
               of a beneficial interest in an Unrestricted Global Note, a
               certificate from such holder in the form of Exhibit B hereto,
               including the certifications in item (4) thereof;

          and, in each such case set forth in this subparagraph (D), if the
          Registrar so requests or if the Applicable Procedures so require, an
          Opinion of Counsel in form reasonably acceptable to the Registrar to
          the effect that such exchange or transfer is in compliance with the
          Securities Act and that the restrictions on transfer contained herein
          and in the Private Placement Legend are no longer required in order to
          maintain compliance with the Securities Act.

     If any such transfer is effected pursuant to subparagraph (B) or (D) above
at a time when an Unrestricted Global Note has not yet been issued, the Company
shall issue and, upon receipt of an Authentication Order in accordance with
Section 2.02 hereof, the Trustee shall authenticate one or more

                                       24
<PAGE>

Unrestricted Global Notes in an aggregate principal amount equal to the
aggregate principal amount of beneficial interests transferred pursuant to
subparagraph (B) or (D) above.

     Beneficial interests in an Unrestricted Global Note cannot be exchanged
for, or transferred to Persons who take delivery thereof in the form of, a
beneficial interest in a Restricted Global Note.

     (c)  Transfer or Exchange of Beneficial Interests for Definitive Notes.

          (i)  Beneficial Interests in Restricted Global Notes to Restricted
     Definitive Notes. If any holder of a beneficial interest in a Restricted
     Global Note proposes to exchange such beneficial interest for a Restricted
     Definitive Note or to transfer such beneficial interest to a Person who
     takes delivery thereof in the form of a Restricted Definitive Note, then,
     upon receipt by the Registrar of the following documentation:

               (A)  if the holder of such beneficial interest in a Restricted
          Global Note proposes to exchange such beneficial interest for a
          Restricted Definitive Note, a certificate from such holder in the form
          of Exhibit C hereto, including the certifications in item (2)(a)
          thereof;

               (B)  if such beneficial interest is being transferred to a QIB in
          accordance with Rule 144A under the Securities Act, a certificate to
          the effect set forth in Exhibit B hereto, including the certifications
          in item (1) thereof;

               (C)  if such beneficial interest is being transferred to a Non-
          U.S. Person in an offshore transaction in accordance with Rule 903 or
          Rule 904 under the Securities Act, a certificate to the effect set
          forth in Exhibit B hereto, including the certifications in item (2)
          thereof;

               (D)  if such beneficial interest is being transferred pursuant to
          an exemption from the registration requirements of the Securities Act
          in accordance with Rule 144 under the Securities Act, a certificate to
          the effect set forth in Exhibit B hereto, including the certifications
          in item (3)(a) thereof;

               (E)  if such beneficial interest is being transferred to an
          Institutional Accredited Investor in reliance on an exemption from the
          registration requirements of the Securities Act other than those
          listed in subparagraphs (B) through (D) above, a certificate to the
          effect set forth in Exhibit B hereto, including the certifications,
          certificates and Opinion of Counsel required by item (3) thereof, if
          applicable;

               (F)  if such beneficial interest is being transferred to the
          Company or any of its Subsidiaries, a certificate to the effect set
          forth in Exhibit B hereto, including the certifications in item (3)(b)
          thereof; or

               (G)  if such beneficial interest is being transferred pursuant to
          an effective registration statement under the Securities Act, a
          certificate to the effect set forth in Exhibit B hereto, including the
          certifications in item (3)(c) thereof,

the Trustee shall cause the aggregate principal amount of the applicable Global
Note to be reduced accordingly pursuant to Section 2.06(h) hereof, and the
Company shall execute and the Trustee shall authenticate and deliver to the
Person designated in the instructions a Definitive Note in the appropriate
principal amount. Any Definitive Note issued in exchange for a

                                       25
<PAGE>

beneficial interest in a Restricted Global Note pursuant to this Section 2.06(c)
shall be registered in such name or names and in such authorized denomination or
denominations as the holder of such beneficial interest shall instruct the
Registrar through instructions from the Depositary and the Participant or
Indirect Participant. The Trustee shall deliver such Definitive Notes to the
Persons in whose names such Notes are so registered. Any Definitive Note issued
in exchange for a beneficial interest in a Restricted Global Note pursuant to
this Section 2.06(c)(i) shall bear the Private Placement Legend and shall be
subject to all restrictions on transfer contained therein.

     (ii)   Beneficial Interests in Restricted Global Notes to Unrestricted
Definitive Notes. A holder of a beneficial interest in a Restricted Global Note
may exchange such beneficial interest for an Unrestricted Definitive Note or may
transfer such beneficial interest to a Person who takes delivery thereof in the
form of an Unrestricted Definitive Note only if:

            (A)   such exchange or transfer is effected pursuant to the Exchange
     Offer in accordance with the Registration Rights Agreement and the holder
     of such beneficial interest, in the case of an exchange, or the transferee,
     in the case of a transfer, certifies in the applicable Letter of
     Transmittal that it is not (1) a broker-dealer, (2) a Person participating
     in the distribution of the Exchange Notes or (3) a Person who is an
     affiliate (as defined in Rule 144) of the Company;

            (B)   such transfer is effected pursuant to the Shelf Registration
     Statement in accordance with the Registration Rights Agreement;

            (C)   such transfer is effected by a Broker-Dealer pursuant to the
     Exchange Offer Registration Statement in accordance with the Registration
     Rights Agreement; or

            (D)   the Registrar receives the following:

                  (1)   if the holder of such beneficial interest in a
            Restricted Global Note proposes to exchange such beneficial interest
            for a Definitive Note that does not bear the Private Placement
            Legend, a certificate from such holder in the form of Exhibit C
            hereto, including the certifications in item (1)(b) thereof; or

                  (2)   if the holder of such beneficial interest in a
            Restricted Global Note proposes to transfer such beneficial interest
            to a Person who shall take delivery thereof in the form of a
            Definitive Note that does not bear the Private Placement Legend, a
            certificate from such holder in the form of Exhibit B hereto,
            including the certifications in item (4) thereof;

     and, in each such case set forth in this subparagraph (D), if the Registrar
     so requests or if the Applicable Procedures so require, an Opinion of
     Counsel in form reasonably acceptable to the Registrar to the effect that
     such exchange or transfer is in compliance with the Securities Act and that
     the restrictions on transfer contained herein and in the Private Placement
     Legend are no longer required in order to maintain compliance with the
     Securities Act.

          (iii)   Beneficial Interests in Unrestricted Global Notes to
Unrestricted Definitive Notes. If any holder of a beneficial interest in an
Unrestricted Global Note proposes to exchange such beneficial interest for a
Definitive Note or to transfer such beneficial interest to a Person who takes
delivery thereof in the form of a Definitive Note, then, upon satisfaction of
the conditions set forth in Section 2.06(b)(ii) hereof, the Trustee shall cause
the aggregate principal

                                       26
<PAGE>

amount of the applicable Global Note to be reduced accordingly pursuant to
Section 2.06(h) hereof, and the Company shall execute and the Trustee shall
authenticate and deliver to the Person designated in the instructions a
Definitive Note in the appropriate principal amount. Any Definitive Note issued
in exchange for a beneficial interest pursuant to this Section 2.06(c)(iii)
shall be registered in such name or names and in such authorized denomination or
denominations as the holder of such beneficial interest shall instruct the
Registrar through instructions from the Depositary and the Participant or
Indirect Participant. The Trustee shall deliver such Definitive Notes to the
Persons in whose names such Notes are so registered. Any Definitive Note issued
in exchange for a beneficial interest pursuant to this Section 2.06(c)(iii)
shall not bear the Private Placement Legend.

(d)  Transfer and Exchange of Definitive Notes for Beneficial Interests.

     (i)  Restricted Definitive Notes to Beneficial Interests in Restricted
Global Notes. If any Holder of a Restricted Definitive Note proposes to exchange
such Note for a beneficial interest in a Restricted Global Note or to transfer
such Restricted Definitive Notes to a Person who takes delivery thereof in the
form of a beneficial interest in a Restricted Global Note, then, upon receipt by
the Registrar of the following documentation:

          (A)  if the Holder of such Restricted Definitive Note proposes to
     exchange such Note for a beneficial interest in a Restricted Global Note, a
     certificate from such Holder in the form of Exhibit C hereto, including the
     certifications in item (2)(b) thereof;

          (B)  if such Restricted Definitive Note is being transferred to a QIB
     in accordance with Rule 144A under the Securities Act, a certificate to the
     effect set forth in Exhibit B hereto, including the certifications in item
     (1) thereof;

          (C)  if such Restricted Definitive Note is being transferred to a Non-
     U.S. Person in an offshore transaction in accordance with Rule 903 or Rule
     904 under the Securities Act, a certificate to the effect set forth in
     Exhibit B hereto, including the certifications in item (2) thereof;

          (D)  if such Restricted Definitive Note is being transferred pursuant
     to an exemption from the registration requirements of the Securities Act in
     accordance with Rule 144 under the Securities Act, a certificate to the
     effect set forth in Exhibit B hereto, including the certifications in item
     (3)(a) thereof;

          (E)  if such Restricted Definitive Note is being transferred to an
     Institutional Accredited Investor in reliance on an exemption from the
     registration requirements of the Securities Act other than those listed in
     subparagraphs (B) through (D) above, a certificate to the effect set forth
     in Exhibit B hereto, including the certifications, certificates and Opinion
     of Counsel required by item (3) thereof, if applicable;

          (F)  if such Restricted Definitive Note is being transferred to the
     Company or any of its Subsidiaries, a certificate to the effect set forth
     in Exhibit B hereto, including the certifications in item (3)(b) thereof;
     or

          (G)  if such Restricted Definitive Note is being transferred pursuant
     to an effective registration statement under the Securities Act, a
     certificate to the effect set forth in Exhibit B hereto, including the
     certifications in item (3)(c) thereof,

                                       27
<PAGE>

the Trustee shall cancel the Restricted Definitive Note, increase or cause to be
increased the aggregate principal amount of, in the case of clause (A) above,
the appropriate Restricted Global Note, in the case of clause (B) above, and the
144A Global Note, in the case of clause (C) above.

     (ii)   Restricted Definitive Notes to Beneficial Interests in Unrestricted
Global Notes. A Holder of a Restricted Definitive Note may exchange such Note
for a beneficial interest in an Unrestricted Global Note or transfer such
Restricted Definitive Note to a Person who takes delivery thereof in the form of
a beneficial interest in an Unrestricted Global Note only if:

            (A)   such exchange or transfer is effected pursuant to the Exchange
     Offer in accordance with the Registration Rights Agreement and the Holder,
     in the case of an exchange, or the transferee, in the case of a transfer,
     certifies in the applicable Letter of Transmittal that it is not (1) a
     broker-dealer, (2) a Person participating in the distribution of the
     Exchange Notes or (3) a Person who is an affiliate (as defined in Rule 144)
     of the Company;

            (B)   such transfer is effected pursuant to the Shelf Registration
     Statement in accordance with the Registration Rights Agreement;

            (C)   such transfer is effected by a Broker-Dealer pursuant to the
     Exchange Offer Registration Statement in accordance with the Registration
     Rights Agreement; or

            (D)   the Registrar receives the following:

                  (1)  if the Holder of such Definitive Notes proposes to
            exchange such Notes for a beneficial interest in the Unrestricted
            Global Note, a certificate from such Holder in the form of Exhibit C
            hereto, including the certifications in item (1)(c) thereof; or

                  (2)  if the Holder of such Definitive Notes proposes to
            transfer such Notes to a Person who shall take delivery thereof in
            the form of a beneficial interest in the Unrestricted Global Note, a
            certificate from such Holder in the form of Exhibit B hereto,
            including the certifications in item (4) thereof;

     and, in each such case set forth in this subparagraph (D), if the Registrar
     so requests or if the Applicable Procedures so require, an Opinion of
     Counsel in form reasonably acceptable to the Registrar to the effect that
     such exchange or transfer is in compliance with the Securities Act and that
     the restrictions on transfer contained herein and in the Private Placement
     Legend are no longer required in order to maintain compliance with the
     Securities Act.

     Upon satisfaction of the conditions of any of the subparagraphs in
this Section 2.06(d)(ii), the Trustee shall cancel the Definitive Notes and
increase or cause to be increased the aggregate principal amount of the
Unrestricted Global Note.

     (iii)  Unrestricted Definitive Notes to Beneficial Interests in
Unrestricted Global Notes. A Holder of an Unrestricted Definitive Note may
exchange such Note for a beneficial interest in an Unrestricted Global Note or
transfer such Definitive Notes to a Person who takes delivery thereof in the
form of a beneficial interest in an Unrestricted Global Note at any time. Upon
receipt of a request for such an exchange or transfer, the Trustee shall cancel
the applicable

                                       28
<PAGE>

     Unrestricted Definitive Note and increase or cause to be increased the
     aggregate principal amount of one of the Unrestricted Global Notes.

          If any such exchange or transfer from a Definitive Note to a
     beneficial interest is effected pursuant to subparagraphs (ii)(B), (ii)(D)
     or (iii) above at a time when an Unrestricted Global Note has not yet been
     issued, the Company shall issue and, upon receipt of an Authentication
     Order in accordance with Section 2.02 hereof, the Trustee shall
     authenticate one or more Unrestricted Global Notes in an aggregate
     principal amount equal to the principal amount of Definitive Notes so
     transferred.

     (e)  Transfer and Exchange of Definitive Notes for Definitive Notes. Upon
request by a Holder of Definitive Notes and such Holder's compliance with the
provisions of this Section 2.06(e), the Registrar shall register the transfer or
exchange of Definitive Notes. Prior to such registration of transfer or
exchange, the requesting Holder shall present or surrender to the Registrar the
Definitive Notes duly endorsed or accompanied by a written instruction of
transfer in form satisfactory to the Registrar duly executed by such Holder or
by its attorney, duly authorized in writing. In addition, the requesting Holder
shall provide any additional certifications, documents and information, as
applicable, required pursuant to the following provisions of this Section
2.06(e).

          (i)   Restricted Definitive Notes to Restricted Definitive Notes. Any
     Restricted Definitive Note may be transferred to and registered in the name
     of Persons who take delivery thereof in the form of a Restricted Definitive
     Note if the Registrar receives the following:

                (A)  if the transfer will be made pursuant to Rule 144A under
          the Securities Act, then the transferor must deliver a certificate in
          the form of Exhibit B hereto, including the certifications in item (1)
          thereof;

                (B)  if the transfer will be made pursuant to Rule 903 or Rule
          904, then the transferor must deliver a certificate in the form of
          Exhibit B hereto, including the certifications in item (2) thereof;
          and

                (C)  if the transfer will be made pursuant to any other
          exemption from the registration requirements of the Securities Act,
          then the transferor must deliver a certificate in the form of Exhibit
          B hereto, including the certifications, certificates and Opinion of
          Counsel required by item (3) thereof, if applicable.

          (ii)  Restricted Definitive Notes to Unrestricted Definitive Notes.
     Any Restricted Definitive Note may be exchanged by the Holder thereof for
     an Unrestricted Definitive Note or transferred to a Person or Persons who
     take delivery thereof in the form of an Unrestricted Definitive Note if:

                (A)   such exchange or transfer is effected pursuant to the
     Exchange Offer in accordance with the Registration Rights Agreement and the
     Holder, in the case of an exchange, or the transferee, in the case of a
     transfer, certifies in the applicable Letter of Transmittal that it is not
     (1) a broker-dealer, (2) a Person participating in the distribution of the
     Exchange Notes or (3) a Person who is an affiliate (as defined in Rule 144)
     of the Company;

                (B)   any such transfer is effected pursuant to the Shelf
     Registration Statement in accordance with the Registration Rights
     Agreement;

                                       29
<PAGE>

               (C)   any such transfer is effected by a Broker-Dealer pursuant
     to the Exchange Offer Registration Statement in accordance with the
     Registration Rights Agreement; or

               (D)   the Registrar receives the following:

                     (1) if the Holder of such Restricted Definitive Notes
               proposes to exchange such Notes for an Unrestricted Definitive
               Note, a certificate from such Holder in the form of Exhibit C
               hereto, including the certifications in item (1)(d) thereof; or

                     (2) if the Holder of such Restricted Definitive Notes
               proposes to transfer such Notes to a Person who shall take
               delivery thereof in the form of an Unrestricted Definitive Note,
               a certificate from such Holder in the form of Exhibit B hereto,
               including the certifications in item (4) thereof;

          and, in each such case set forth in this subparagraph (D), if the
          Registrar so requests, an Opinion of Counsel in form reasonably
          acceptable to the Company to the effect that such exchange or transfer
          is in compliance with the Securities Act and that the restrictions on
          transfer contained herein and in the Private Placement Legend are no
          longer required in order to maintain compliance with the Securities
          Act.

          (iii)  Unrestricted Definitive Notes to Unrestricted Definitive Notes.
     A Holder of Unrestricted Definitive Notes may transfer such Notes to a
     Person who takes delivery thereof in the form of an Unrestricted Definitive
     Note. Upon receipt of a request to register such a transfer, the Registrar
     shall register the Unrestricted Definitive Notes pursuant to the
     instructions from the Holder thereof.

     (f)  Exchange Offer. Upon the occurrence of the Exchange Offer in
accordance with the Registration Rights Agreement, the Company shall issue and,
upon receipt of an Authentication Order in accordance with Section 2.02, the
Trustee shall authenticate (i) one or more Unrestricted Global Notes in an
aggregate principal amount equal to the principal amount of the beneficial
interests in the Restricted Global Notes tendered for acceptance by Persons that
certify in the applicable Letters of Transmittal that (x) they are not broker-
dealers, (y) they are not participating in a distribution of the Exchange Notes
and (z) they are not affiliates (as defined in Rule 144) of the Company, and
accepted for exchange in the Exchange Offer and (ii) Definitive Notes in an
aggregate principal amount equal to the principal amount of the Restricted
Definitive Notes accepted for exchange in the Exchange Offer. Concurrently with
the issuance of such Notes, the Trustee shall cause the aggregate principal
amount of the applicable Restricted Global Notes to be reduced accordingly, and
the Company shall execute and the Trustee shall authenticate and deliver to the
Persons designated by the Holders of Definitive Notes so accepted Definitive
Notes in the appropriate principal amount.

     (g)  Legends.  The following legends shall appear on the face of all Global
Notes and Definitive Notes issued under this Indenture unless specifically
stated otherwise in the applicable provisions of this Indenture.

          (i)  Private Placement Legend.

               (A)  Except as permitted by subparagraph (B) below, each Global
          Note and each Definitive Note (and all Notes issued in exchange
          therefor or substitution thereof) shall bear the legend in
          substantially the following form

                                       30
<PAGE>

  "THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
  AMENDED (THE ''SECURITIES ACT''), AND, ACCORDINGLY, MAY NOT BE OFFERED OR SOLD
  WITHIN THE UNITED STATES OR TO, OR FOR THE ACCOUNT OR BENEFIT OF, U.S. PERSONS
  EXCEPT AS SET FORTH BELOW. BY ITS ACQUISITION HEREOF, THE HOLDER (1)
  REPRESENTS THAT IT IS A ''QUALIFIED INSTITUTIONAL BUYER'' (AS DEFINED IN RULE
  144A UNDER THE SECURITIES ACT), (2) AGREES THAT IT WILL NOT WITHIN TWO YEARS
  AFTER THE ORIGINAL ISSUANCE OF THIS SECURITY RESELL OR OTHERWISE TRANSFER THIS
  SECURITY EXCEPT (A) TO THE COMPANY OR ANY SUBSIDIARY THEREOF, (B) INSIDE THE
  UNITED STATES TO A QUALIFIED INSTITUTIONAL BUYER IN COMPLIANCE WITH RULE 144A
  UNDER THE SECURITIES ACT, (C) INSIDE THE UNITED STATES TO AN ACCREDITED
  INVESTOR (AS DEFINED IN RULE 501(a)(1),(2), (3) or (7) UNDER THE SECURITIES
  ACT) THAT, PRIOR TO SUCH TRANSFER, FURNISHES (OR HAS FURNISHED ON ITS BEHALF
  BY A U.S. BROKER-DEALER) TO THE TRUSTEE A SIGNED LETTER CONTAINING CERTAIN
  REPRESENTATIONS AND AGREEMENTS RELATING TO THE RESTRICTIONS ON TRANSFER OF
  THIS SECURITY (THE FORM OF WHICH LETTER CAN BE OBTAINED FROM THE TRUSTEE FOR
  THIS SECURITY), (D) OUTSIDE THE UNITED STATES IN AN OFFSHORE TRANSACTION IN
  COMPLIANCE WITH RULE 904 OF REGULATION S UNDER THE SECURITIES ACT, (E)
  PURSUANT TO THE EXEMPTION FROM REGISTRATION PROVIDED BY RULE 144 UNDER THE
  SECURITIES ACT (IF AVAILABLE), OR (F) PURSUANT TO AN EFFECTIVE REGISTRATION
  STATEMENT UNDER THE SECURITIES ACT AND (3) AGREES THAT IT WILL GIVE TO EACH
  PERSON TO WHOM THIS SECURITY IS TRANSFERRED A NOTICE SUBSTANTIALLY TO THE
  EFFECT OF THIS LEGEND. IN CONNECTION WITH ANY TRANSFER OF THIS SECURITY WITHIN
  ONE YEAR AFTER THE ORIGINAL ISSUANCE OF THIS SECURITY, IF THE PROPOSED
  TRANSFEREE IS AN ACCREDITED INVESTOR, THE HOLDER MUST, PRIOR TO SUCH TRANSFER,
  FURNISH TO THE TRUSTEE AND THE COMPANY SUCH CERTIFICATIONS, LEGAL OPINIONS OR
  OTHER INFORMATION AS EITHER OF THEM MAY REASONABLY REQUIRE TO CONFIRM THAT
  SUCH TRANSFER IS BEING MADE PURSUANT TO AN EXEMPTION FROM, OR IN A TRANSACTION
  NOT SUBJECT TO, THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT. AS USED
  HEREIN, THE TERMS ''OFFSHORE TRANSACTION,'' ''UNITED STATES'' AND ''U.S.
  PERSON'' HAVE THE MEANING GIVEN TO THEM BY REGULATION S UNDER THE SECURITIES
  ACT."

               (B) Notwithstanding the foregoing, any Global Note or Definitive
     Note issued pursuant to subparagraphs (b)(iv), (c)(iii), (c)(iv), (d)(ii),
     (d)(iii), (e)(ii), (e)(iii) or (f) to this Section 2.06 (and all Notes
     issued in exchange therefor or substitution thereof) shall not bear the
     Private Placement Legend.

     (ii) Global Note Legend. Each Global Note shall bear a legend in
substantially the following form:

"THIS GLOBAL NOTE IS HELD BY THE DEPOSITARY (AS DEFINED IN THE INDENTURE
GOVERNING THIS NOTE) OR ITS NOMINEE IN CUSTODY FOR THE BENEFIT OF THE BENEFICIAL
OWNERS HEREOF, AND IS NOT TRANSFERABLE TO ANY PERSON UNDER ANY CIRCUMSTANCES
EXCEPT THAT (I) THE TRUSTEE MAY MAKE SUCH NOTATIONS HEREON AS MAY BE REQUIRED
PURSUANT TO SECTION 2.07 OF THE INDENTURE, (II) THIS GLOBAL NOTE MAY BE
EXCHANGED IN WHOLE BUT NOT IN PART PURSUANT TO SECTION 2.06(a) OF THE INDENTURE,
(III) THIS GLOBAL NOTE MAY BE DELIVERED TO THE TRUSTEE FOR CANCELLATION PURSUANT
TO SECTION 2.11 OF THE INDENTURE AND

                                       31
<PAGE>

(IV) THIS GLOBAL NOTE MAY BE TRANSFERRED TO A SUCCESSOR DEPOSITARY WITH THE
PRIOR WRITTEN CONSENT OF THE COMPANY."

          (iii) Unit Legend. Each Note issued prior to the Separation Date shall
bear the following legend (the "Unit Legend") on the face thereof:

"THE NOTES EVIDENCED BY THIS CERTIFICATE ARE INITIALLY ISSUED AS PART OF AN
ISSUANCE OF UNITS, EACH OF WHICH CONSIST OF $1,000 PRINCIPAL AMOUNT OF THE NOTES
AND ONE WARRANT (THE "WARRANTS") INITIALLY ENTITLING THE HOLDER THEREOF TO
PURCHASE 8.024815 SHARES, PAR VALUE $___ PER SHARE, OF XM SATELLITE RADIO
HOLDINGS INC. PRIOR TO THE CLOSE OF BUSINESS UPON THE EARLIEST TO OCCUR OF (i)
THE COMMENCEMENT OF AN EXCHANGE OFFER OR THE EFFECTIVENESS OF A SHELF
REGISTRATION STATEMENT RELATING TO THE NOTES, (ii) SEPTEMBER 11, 2000 OR (iii)
SUCH DATE AS BEAR, STEARNS & CO. INC. AND DONALDSON, LUFKIN & JENRETTE
SECURITIES CORPORATION SHALL DETERMINE, THE NOTES EVIDENCED BY THIS CERTIFICATE
MAY NOT BE TRANSFERRED OR EXCHANGED SEPARATELY FROM, BUT MAY BE TRANSFERRED OR
EXCHANGED ONLY TOGETHER WITH, THE WARRANTS."

     (h) Cancellation and/or Adjustment of Global Notes. At such time as all
beneficial interests in a particular Global Note have been exchanged for
Definitive Notes or a particular Global Note has been redeemed, repurchased or
canceled in whole and not in part, each such Global Note shall be returned to or
retained and canceled by the Trustee in accordance with Section 2.11 hereof. At
any time prior to such cancellation, if any beneficial interest in a Global Note
is exchanged for or transferred to a Person who will take delivery thereof in
the form of a beneficial interest in another Global Note or for Definitive
Notes, the principal amount of Notes represented by such Global Note shall be
reduced accordingly and an endorsement shall be made on such Global Note by the
Trustee or by the Depositary at the direction of the Trustee to reflect such
reduction; and if the beneficial interest is being exchanged for or transferred
to a Person who will take delivery thereof in the form of a beneficial interest
in another Global Note, such other Global Note shall be increased accordingly
and an endorsement shall be made on such Global Note by the Trustee or by the
Depositary at the direction of the Trustee to reflect such increase.

     (i)   General Provisions Relating to Transfers and Exchanges.

           (i)  To permit registrations of transfers and exchanges, the Company
     shall execute and the Trustee shall authenticate Global Notes and
     Definitive Notes upon the Company's order or at the Registrar's request.

          (ii)  No service charge shall be made to a holder of a beneficial
     interest in a Global Note or to a Holder of a Definitive Note for any
     registration of transfer or exchange, but the Company may require payment
     of a sum sufficient to cover any transfer tax or similar governmental
     charge payable in connection therewith (other than any such transfer taxes
     or similar governmental charge payable upon exchange or transfer pursuant
     to Sections 2.10, 3.06, 3.09, 4.10, 4.14 and 9.05 hereof).

          (iii) The Registrar shall not be required to register the transfer of
     or exchange any Note selected for redemption in whole or in part, except
     the unredeemed portion of any Note being redeemed in part.

          (iv) All Global Notes and Definitive Notes issued upon any
     registration of transfer or exchange of Global Notes or Definitive Notes
     shall be the valid obligations of the Company,

                                       32
<PAGE>

     evidencing the same debt, and entitled to the same benefits under this
     Indenture, as the Global Notes or Definitive Notes surrendered upon such
     registration of transfer or exchange.

          (v)    The Company shall not be required (A) to issue, to register the
     transfer of or to exchange any Notes during a period beginning at the
     opening of business 15 days before the day of any selection of Notes for
     redemption under Section 3.02 hereof and ending at the close of business on
     the day of selection, (B) to register the transfer of or to exchange any
     Note so selected for redemption in whole or in part, except the unredeemed
     portion of any Note being redeemed in part or (C) to register the transfer
     of or to exchange a Note between a record date and the next succeeding
     Interest Payment Date.

          (vi)   Prior to due presentment for the registration of a transfer of
     any Note, the Trustee, any Agent and the Company may deem and treat the
     Person in whose name any Note is registered as the absolute owner of such
     Note for the purpose of receiving payment of principal of and interest on
     such Notes and for all other purposes, and none of the Trustee, any Agent
     or the Company shall be affected by notice to the contrary.

          (vii)  The Trustee shall authenticate Global Notes and Definitive
     Notes in accordance with the provisions of Section 2.02 hereof.

          (viii)  All certifications, certificates and Opinions of Counsel
     required to be submitted to the Registrar pursuant to this Section 2.06 to
     effect a registration of transfer or exchange may be submitted by
     facsimile.

Section 2.07.  Replacement Notes.

     If any mutilated Note is surrendered to the Trustee or the Company and the
Trustee receives evidence to its satisfaction of the destruction, loss or theft
of any Note, the Company shall issue and the Trustee, upon receipt of an
Authentication Order, shall authenticate a replacement Note if the Trustee's
requirements are met. If required by the Trustee or the Company, an indemnity
bond must be supplied by the Holder that is sufficient in the judgment of the
Trustee and the Company to protect the Company, the Trustee, any Agent and any
authenticating agent from any loss that any of them may suffer if a Note is
replaced. The Company may charge for its expenses in replacing a Note.

     Every replacement Note is an additional obligation of the Company and shall
be entitled to all of the benefits of this Indenture equally and proportionately
with all other Notes duly issued hereunder.

Section 2.08.  Outstanding Notes.

     The Notes outstanding at any time are all the Notes authenticated by the
Trustee except for those canceled by it, those delivered to it for cancellation,
those reductions in the interest in a Global Note effected by the Trustee in
accordance with the provisions hereof, and those described in this Section as
not outstanding. Except as set forth in Section 2.09 hereof, a Note does not
cease to be outstanding because the Company or an Affiliate of the Company holds
the Note; however, Notes held by the Company or a Subsidiary of the Company
shall not be deemed to be outstanding for purposes of Section 3.07(b) hereof.

     If a Note is replaced pursuant to Section 2.07 hereof, it ceases to be
outstanding unless the Trustee receives proof satisfactory to it that the
replaced Note is held by a bona fide purchaser.

                                       33
<PAGE>

     If the principal amount of any Note is considered paid under Section 4.01
hereof, it ceases to be outstanding and interest on it ceases to accrue.

     If the Paying Agent (other than the Company, a Subsidiary or an Affiliate
of any thereof) holds, on a redemption date or maturity date, money sufficient
to pay Notes payable on that date, then on and after that date such Notes shall
be deemed to be no longer outstanding and shall cease to accrue interest.

Section 2.09.  Treasury Notes.

     In determining whether the Holders of the required principal amount of
Notes have concurred in any direction, waiver or consent, Notes owned by the
Company, or by any Person directly or indirectly controlling or controlled by or
under direct or indirect common control with the Company, shall be considered as
though not outstanding, except that for the purposes of determining whether the
Trustee shall be protected in relying on any such direction, waiver or consent,
only Notes that the Trustee knows are so owned shall be so disregarded.

Section 2.10.  Temporary Notes.

     Until certificates representing Notes are ready for delivery, the Company
may prepare and the Trustee, upon receipt of an Authentication Order, shall
authenticate temporary Notes. Temporary Notes shall be substantially in the form
of certificated Notes but may have variations that the Company considers
appropriate for temporary Notes and as shall be reasonably acceptable to the
Trustee. Without unreasonable delay, the Company shall prepare and the Trustee
shall authenticate definitive Notes in exchange for temporary Notes.

     Holders of temporary Notes shall be entitled to all of the benefits of this
Indenture.

Section 2.11.  Cancellation.

     The Company at any time may deliver Notes to the Trustee for cancellation.
The Registrar and Paying Agent shall forward to the Trustee any Notes
surrendered to them for registration of transfer, exchange or payment. The
Trustee and no one else shall cancel all Notes surrendered for registration of
transfer, exchange, payment, replacement or cancellation and shall destroy
canceled Notes (subject to the record retention requirement of the Exchange
Act). Certification of the destruction of all canceled Notes shall be delivered
to the Company. The Company may not issue new Notes to replace Notes that it has
paid or that have been delivered to the Trustee for cancellation.

Section 2.12.  Defaulted Interest.

     If the Company defaults in a payment of interest on the Notes, it shall pay
the defaulted interest in any lawful manner plus, to the extent lawful, interest
payable on the defaulted interest, to the Persons who are Holders on a
subsequent special record date, in each case at the rate provided in the Notes
and in Section 4.01 hereof. The Company shall notify the Trustee in writing of
the amount of defaulted interest proposed to be paid on each Note and the date
of the proposed payment. The Company shall fix or cause to be fixed each such
special record date and payment date, provided that no such special record date
shall be less than 10 days prior to the related payment date for such defaulted
interest. At least 15 days before the special record date, the Company (or, upon
the written request of the Company, the Trustee in the name and at the expense
of the Company) shall mail or cause to be mailed to Holders a notice that states
the special record date, the related payment date and the amount of such
interest to be paid.

                                       34
<PAGE>

                                  ARTICLE 3.
                           REDEMPTION AND PREPAYMENT

Section 3.01.  Notices to Trustee.

     If the Company elects to redeem Notes pursuant to the optional redemption
provisions of Section 3.07 hereof, it shall furnish to the Trustee, at least 30
days but not more than 60 days before a redemption date, an Officers'
Certificate setting forth (i) the clause of this Indenture pursuant to which the
redemption shall occur, (ii) the redemption date, (iii) the principal amount of
Notes to be redeemed and (iv) the redemption price.

Section 3.02.  Selection of Notes to Be Redeemed.

     If less than all of the Notes are to be redeemed or purchased in an offer
to purchase at any time, the Trustee shall select the Notes to be redeemed or
purchased among the Holders of the Notes in compliance with the requirements of
the principal national securities exchange, if any, on which the Notes are
listed or, if the Notes are not so listed, on a pro rata basis, by lot or in
accordance with any other method the Trustee considers fair and appropriate. In
the event of partial redemption by lot, the particular Notes to be redeemed
shall be selected, unless otherwise provided herein, not less than 30 nor more
than 60 days prior to the redemption date by the Trustee from the outstanding
Notes not previously called for redemption.

     The Trustee shall promptly notify the Company in writing of the Notes
selected for redemption and, in the case of any Note selected for partial
redemption, the principal amount thereof to be redeemed. Notes and portions of
Notes selected shall be in amounts of $1,000 or whole multiples of $1,000;
except that if all of the Notes of a Holder are to be redeemed, the entire
outstanding amount of Notes held by such Holder, even if not a multiple of
$1,000, shall be redeemed. Except as provided in the preceding sentence,
provisions of this Indenture that apply to Notes called for redemption also
apply to portions of Notes called for redemption.

Section 3.03.  Notice of Redemption.

     Subject to the provisions of Section 3.09 hereof, at least 30 days but not
more than 60 days before a redemption date, the Company shall mail or cause to
be mailed, by first class mail, a notice of redemption to each Holder whose
Notes are to be redeemed at its registered address.

     The notice shall identify the Notes to be redeemed and shall state:

     (a)  the redemption date;

     (b)  the redemption price;

     (c)  if any Note is being redeemed in part, the portion of the principal
amount of such Note to be redeemed and that, after the redemption date upon
surrender of such Note, a new Note or Notes in principal amount equal to the
unredeemed portion shall be issued upon cancellation of the original Note;

     (d)  the name and address of the Paying Agent;

     (e)  that Notes called for redemption must be surrendered to the Paying
Agent to collect the redemption price;

                                       35
<PAGE>

          (f)  that, unless the Company defaults in making such redemption
payment, interest on Notes called for redemption ceases to accrue on and after
the redemption date ;

          (g)  the paragraph of the Notes and/or Section of this Indenture
pursuant to which the Notes called for redemption are being redeemed; and

          (h)  that no representation is made as to the correctness or accuracy
of the CUSIP number, if any, listed in such notice or printed on the Notes.

          At the Company's request, the Trustee shall give the notice of
redemption in the Company's name and at its expense; provided, however, that the
Company shall have delivered to the Trustee, at least 45 days prior to the
redemption date, an Officers' Certificate requesting that the Trustee give such
notice and setting forth the information to be stated in such notice as provided
in the preceding paragraph.

Section 3.04.  Effect of Notice of Redemption.

          Once notice of redemption is mailed in accordance with Section 3.03
hereof, Notes called for redemption become irrevocably due and payable on the
redemption date at the redemption price. A notice of redemption may not be
conditional.

Section 3.05.  Deposit of Redemption Price.

          One Business Day prior to the redemption date, the Company shall
deposit with the Trustee or with the Paying Agent money sufficient to pay the
redemption price of and accrued interest on all Notes to be redeemed on that
date. The Trustee or the Paying Agent shall promptly return to the Company any
money deposited with the Trustee or the Paying Agent by the Company in excess of
the amounts necessary to pay the redemption price of, and accrued interest on,
all Notes to be redeemed.

          If the Company complies with the provisions of the preceding
paragraph, on and after the redemption date, interest shall cease to accrue on
the Notes or the portions of Notes called for redemption. If a Note is redeemed
on or after an interest record date but on or prior to the related interest
payment date, then any accrued and unpaid interest shall be paid to the Person
in whose name such Note was registered at the close of business on such record
date. If any Note called for redemption shall not be so paid upon surrender for
redemption because of the failure of the Company to comply with the preceding
paragraph, interest shall be paid on the unpaid principal, from the redemption
date until such principal is paid, and to the extent lawful on any interest not
paid on such unpaid principal, in each case at the rate provided in the Notes
and in Section 4.01 hereof.

Section 3.06.  Notes Redeemed in Part.

          Upon surrender of a Note that is redeemed in part, the Company shall
issue and, upon the Company's written request, the Trustee shall authenticate
for the Holder at the expense of the Company a new Note equal in principal
amount to the unredeemed portion of the Note surrendered.

Section 3.07.  Optional Redemption.

          (a) Except as set forth in clause (b) of this Section 3.07, the
Company shall not have the option to redeem the Notes pursuant to this Section
3.07 prior to March 15, 2005. Thereafter, the Company shall have the option to
redeem all or a part of the Notes upon not less than 30 nor more than 60 days'
notice, at the redemption prices (expressed as percentages of principal amount)
set forth below plus

                                       36
<PAGE>

accrued and unpaid interest and Liquidated Damages, if any, thereon to the
applicable redemption date, if redeemed during the twelve-month period beginning
on March 15, of the years indicated below:

     Year                                                      Percentage
     ----                                                      ----------
     2005..................................................      107.000%
     2006..................................................      104.667%
     2007..................................................      102.333%
     2008 and thereafter...................................      100.000%

     (b)       At any time prior to March 15, 2003, the Company may on any one
or more occasions redeem up to 35% of the aggregate principal amount of Notes
issued under this Indenture at a redemption price of 114% of the principal
amount thereof, plus accrued and unpaid interest and Liquidated Damages, if any,
to the redemption date, with the net cash proceeds of one or more equity
offerings by the Company or parent corporation of the Company, the net proceeds
of which are contributed to the common equity of the Company (other than an
offering of Disqualified Stock); provided that at least 65% of the aggregate
principal amount of the Notes issued under this Indenture remains outstanding
immediately after the occurrence of such redemption (excluding Notes held by the
Company and its subsidiaries) and that such redemption occurs within 90 days of
the date of the closing of such equity offering.

     (c)       Any redemption pursuant to this Section 3.07 shall be made
pursuant to the provisions of Section 3.01 through 3.06 hereof.

Section 3.08.  Mandatory Redemption.

     The Company shall not be required to make mandatory redemption payments
with respect to the Notes.

Section 3.09.  Offer to Purchase by Application of Excess Proceeds.

     In the event that, pursuant to Section 4.10 hereof, the Company shall be
required to commence an offer to all Holders to purchase Notes (an "Asset Sale
Offer"), it shall follow the procedures specified below.

     The Asset Sale Offer shall remain open for a period of 20 Business Days
following its commencement and no longer, except to the extent that a longer
period is required by applicable law (the "Offer Period"). No later than five
Business Days after the termination of the Offer Period (the "Purchase Date"),
the Company shall purchase the principal amount of Notes required to be
purchased pursuant to Section 4.10 hereof (the "Offer Amount") or, if less than
the Offer Amount has been tendered, all Notes tendered in response to the Asset
Sale Offer. Payment for any Notes so purchased shall be made in the same manner
as interest payments are made.

     If the Purchase Date is on or after an interest record date and on or
before the related interest payment date, any accrued and unpaid interest shall
be paid to the Person in whose name a Note is registered at the close of
business on such record date, and no additional interest shall be payable to
Holders who tender Notes pursuant to the Asset Sale Offer.

     Upon the commencement of an Asset Sale Offer, the Company shall send, by
first class mail, a notice to the Trustee and each of the Holders, with a copy
to the Trustee. The notice shall contain all instructions and materials
necessary to enable such Holders to tender Notes pursuant to the Asset Sale
Offer. The Asset Sale Offer shall be made to all Holders. The notice, which
shall govern the terms of the Asset Sale Offer, shall state:

                                       37
<PAGE>

     (a)  that the Asset Sale Offer is being made pursuant to this Section 3.09
and Section 4.10 hereof and the length of time the Asset Sale Offer shall remain
open;

     (b)  the Offer Amount, the purchase price and the Purchase Date;

     (c)  that any Note not tendered or accepted for payment shall continue to
accrete or accrue interest;

     (d)  that, unless the Company defaults in making such payment, any Note
accepted for payment pursuant to the Asset Sale Offer shall cease to accrete or
accrue interest after the Purchase Date;

     (e)  that Holders electing to have a Note purchased pursuant to an Asset
Sale Offer may elect to have Notes purchased in integral multiples of $1,000
only;
     (f)  that Holders electing to have a Note purchased pursuant to any Asset
Sale Offer shall be required to surrender the Note, with the form entitled
"Option of Holder to Elect Purchase" on the reverse of the Note completed, or
transfer by book-entry transfer, to the Company, a depositary, if appointed by
the Company, or a Paying Agent at the address specified in the notice at least
three days before the Purchase Date;

     (g)  that Holders shall be entitled to withdraw their election if the
Company, the depositary or the Paying Agent, as the case may be, receives, not
later than the expiration of the Offer Period, a telegram, telex, facsimile
transmission or letter setting forth the name of the Holder, the principal
amount of the Note the Holder delivered for purchase and a statement that such
Holder is withdrawing his election to have such Note purchased;

     (h)  that, if the aggregate principal amount of Notes surrendered by
Holders exceeds the Offer Amount, the Company shall select the Notes to be
purchased on a pro rata basis (with such adjustments as may be deemed
appropriate by the Company so that only Notes in denominations of $1,000, or
integral multiples thereof, shall be purchased); and

     (i) that Holders whose Notes were purchased only in part shall be issued
new Notes equal in principal amount to the unpurchased portion of the Notes
surrendered (or transferred by book-entry transfer).

     On or before the Purchase Date, the Company shall, to the extent lawful,
accept for payment, on a pro rata basis to the extent necessary, the Offer
Amount of Notes or portions thereof tendered pursuant to the Asset Sale Offer,
or if less than the Offer Amount has been tendered, all Notes tendered, and
shall deliver to the Trustee an Officers' Certificate stating that such Notes or
portions thereof were accepted for payment by the Company in accordance with the
terms of this Section 3.09. The Company, the Depositary or the Paying Agent, as
the case may be, shall promptly (but in any case not later than five days after
the Purchase Date) mail or deliver to each tendering Holder an amount equal to
the purchase price of the Notes tendered by such Holder and accepted by the
Company for purchase, and the Company shall promptly issue a new Note, and the
Trustee, upon written request from the Company shall authenticate and mail or
deliver such new Note to such Holder, in a principal amount equal to any
unpurchased portion of the Note surrendered. Any Note not so accepted shall be
promptly mailed or delivered by the Company to the Holder thereof. The Company
shall publicly announce the results of the Asset Sale Offer on the Purchase
Date.

     Other than as specifically provided in this Section 3.09, any purchase
pursuant to this Section 3.09 shall be made pursuant to the provisions of
Sections 3.01 through 3.06 hereof.

                                       38
<PAGE>

                                   ARTICLE 4.
                                   COVENANTS

Section 4.01.  Payment of Notes.

     The Company shall pay or cause to be paid the principal of, premium, if
any, and interest on the Notes on the dates and in the manner provided in the
Notes. Principal, premium, if any, and interest shall be considered paid on the
date due if the Paying Agent, if other than the Company or a Subsidiary thereof,
holds as of 10:00 a.m. Eastern Time on the due date money deposited by the
Company in immediately available funds and designated for and sufficient to pay
all principal, premium, if any, and interest then due. The Company shall pay all
Liquidated Damages, if any, in the same manner on the dates and in the amounts
set forth in the Registration Rights Agreement.

     The Company shall pay interest (including post-petition interest in any
proceeding under any Bankruptcy Law) on overdue principal at the rate equal to
1% per annum in excess of the then applicable interest rate on the Notes to the
extent lawful; it shall pay interest (including post-petition interest in any
proceeding under any Bankruptcy Law) on overdue installments of interest and
Liquidated Damages (without regard to any applicable grace period) at the same
rate to the extent lawful.

Section 4.02.  Maintenance of Office or Agency.

     The Company shall maintain in the Borough of Manhattan, the City of New
York, an office or agency (which may be an office of the Trustee or an affiliate
of the Trustee, Registrar or co-registrar) where Notes may be surrendered for
registration of transfer or for exchange and where notices and demands to or
upon the Company in respect of the Notes and this Indenture may be served. The
Company shall give prompt written notice to the Trustee of the location, and any
change in the location, of such office or agency. If at any time the Company
shall fail to maintain any such required office or agency or shall fail to
furnish the Trustee with the address thereof, such presentations, surrenders,
notices and demands may be made or served at the Corporate Trust Office of the
Trustee.

     The Company may also from time to time designate one or more other offices
or agencies where the Notes may be presented or surrendered for any or all such
purposes and may from time to time rescind such designations; provided, however,
that no such designation or rescission shall in any manner relieve the Company
of its obligation to maintain an office or agency in the Borough of Manhattan,
the City of New York for such purposes. The Company shall give prompt written
notice to the Trustee of any such designation or rescission and of any change in
the location of any such other office or agency.

     The Company hereby designates the Corporate Trust Office of the Trustee as
one such office or agency of the Company in accordance with Section 2.03.

Section 4.03.  Reports.

     (a)       Whether or not required by the rules and regulations of the SEC,
so long as any Notes are outstanding, the Company shall furnish to the Holders
of Notes, within 15 days following the time periods specified in the SEC's rules
and regulations: (i) all quarterly and annual financial information that would
be required to be contained in a filing with the SEC on Forms 10-Q and 10-K if
the Company were required to file such forms, including a "Management's
Discussion and Analysis of Financial Condition and Results of Operations" and,
with respect to the annual information only, a report thereon by the Company's
certified independent accountants and (ii) all current reports that would be
required to be filed with the SEC on Form 8-K if the Company were required to
file such reports. In addition, following consummation of the Exchange Offer,
whether or not required by the rules and regulations of

                                       39
<PAGE>

the SEC, the Company shall file a copy of all such information and reports
referred to in clauses (i) and (ii) above with the SEC for public availability
within the time periods specified in the SEC's rules and regulations (unless the
SEC will not accept such a filing) and make such information available to
securities analysts and prospective investors upon request. The Company shall at
all times comply with TIA (S) 314(a).

     (b)       For so long as any Notes remain outstanding, the Company shall
furnish to the Holders and to securities analysts and prospective investors,
upon their request, the information required to be delivered pursuant to Rule
144A(d)(4) under the Securities Act.

     (c)       If any of the Company's Unrestricted Subsidiaries constitute
Significant Subsidiaries, then the quarterly and annual financial information
required by the preceding paragraphs shall include a reasonably detailed
presentation, either on the face of the financial statements or in the footnotes
thereto, and in Management's Discussion and Analysis of Financial Condition and
Results of Operations, of the financial condition and results of operations of
the Company and its Restricted Subsidiaries separate from the financial
condition and results of operations of the Unrestricted Subsidiaries of the
Company.

Section 4.04.  Compliance Certificate.

     (a)       The Company shall deliver to the Trustee, within 90 days after
the end of each fiscal year, an Officers' Certificate stating that a review of
the activities of the Company and its Subsidiaries during the preceding fiscal
year has been made under the supervision of the signing Officers with a view to
determining whether the Company has kept, observed, performed and fulfilled its
obligations under this Indenture and the Pledge Agreement, and further stating,
as to each such Officer signing such certificate, that to the best of his or her
knowledge the Company has kept, observed, performed and fulfilled each and every
covenant contained in this Indenture and the Pledge Agreement and is not in
default in the performance or observance of any of the terms, provisions and
conditions of this Indenture or the Pledge Agreement (or, if a Default or Event
of Default shall have occurred, describing all such Defaults or Events of
Default of which he or she may have knowledge and what action the Company is
taking or proposes to take with respect thereto) and that to the best of his or
her knowledge no event has occurred and remains in existence by reason of which
payments on account of the principal of or interest, if any, on the Notes is
prohibited or if such event has occurred, a description of the event and what
action the Company is taking or proposes to take with respect thereto.

     (b)       So long as not contrary to the then current recommendations of
the American Institute of Certified Public Accountants, the year-end financial
statements delivered pursuant to Section 4.03(a) above shall be accompanied by a
written statement of the Company's independent public accountants (who shall be
a firm of established national reputation) that in making the examination
necessary for certification of such financial statements, nothing has come to
their attention that would lead them to believe that the Company has violated
any provisions of Article 4 or Article 5 hereof or, if any such violation has
occurred, specifying the nature and period of existence thereof, it being
understood that such accountants shall not be liable directly or indirectly to
any Person for any failure to obtain knowledge of any such violation.

     (c)       The Company shall, so long as any of the Notes are outstanding,
deliver to the Trustee, forthwith upon any Officer becoming aware of any Default
or Event of Default, an Officers' Certificate specifying such Default or Event
of Default and what action the Company is taking or proposes to take with
respect thereto.

                                       40
<PAGE>

Section 4.05.  Taxes.

     The Company shall pay, and shall cause each of its Subsidiaries to pay,
prior to delinquency, all material taxes, assessments, and governmental levies
except such as are contested in good faith and by appropriate proceedings or
where the failure to effect such payment is not adverse in any material respect
to the Holders of the Notes.

Section 4.06.  Stay, Extension and Usury Laws.

     The Company covenants (to the extent that it may lawfully do so) that it
shall not at any time insist upon, plead, or in any manner whatsoever claim or
take the benefit or advantage of, any stay, extension or usury law wherever
enacted, now or at any time hereafter in force, that may affect the covenants or
the performance of this Indenture; and the Company (to the extent that it may
lawfully do so) hereby expressly waives all benefit or advantage of any such
law, and covenants that it shall not, by resort to any such law, hinder, delay
or impede the execution of any power herein granted to the Trustee, but shall
suffer and permit the execution of every such power as though no such law has
been enacted.

Section 4.07.  Restricted Payments.

     The Company shall not, and shall not permit any of its Subsidiaries to,
directly or indirectly: (i) declare or pay any dividend or make any other
payment or distribution on account of the Company's Equity Interests (including,
without limitation, any payment in connection with any merger or consolidation
involving the Company) or to the direct or indirect holders of the Company's
Equity Interests in their capacity as such (other than dividends or
distributions payable in Equity Interests (other than Disqualified Stock) of the
Company and cash in lieu of fractional interests not to exceed 1% of the Equity
Interests distributed or paid); (ii) purchase, redeem or otherwise acquire or
retire for value (including without limitation, in connection with any merger or
consolidation involving the Company) any Equity Interests of the Company (other
than any such Equity Interests owned by the Company or any of its Restricted
Subsidiaries) or any Affiliate of the Company (other than any of its Restricted
Subsidiaries); (iii) make any payment on or with respect to, or purchase,
redeem, defease or otherwise acquire or retire for value any Indebtedness that
is subordinated to the Notes except a payment of interest or principal at Stated
Maturity thereof; or (iv) make any Restricted Investment (all such payments and
other actions set forth in clauses (i) through (iv) above being collectively
referred to as "Restricted Payments"), unless, at the time of and after giving
effect to such Restricted Payment:

               (a)  no Default or Event of Default shall have occurred and be
continuing or would occur as a consequence thereof; and

               (b)  the Company would, at the time of such Restricted Payment
and after giving pro forma effect thereto as if such Restricted Payment had been
made at the beginning of the applicable four-quarter period, have been permitted
to incur at least $1.00 of additional Indebtedness pursuant to the Total
Consolidated Indebtedness to Adjusted Cash Flow ratio test set forth in Section
4.09(i); and

               (c) such Restricted Payment, together with the aggregate amount
of all other Restricted Payments made by the Company and its Restricted
Subsidiaries after the date hereof (excluding Restricted Payments permitted by
clauses (2), (3) and (4) of the next succeeding paragraph), is less than the
sum, without duplication of (a) the difference between (i) the Cumulative
Available Cash Flow determined at the time of such Restricted Payment and (ii)
150% of the cumulative Consolidated Interest Expense of the Company determined
for the period commencing on the beginning of the first fiscal quarter
commencing after the date hereof and

                                       41
<PAGE>

     ending on the last day of the latest fiscal quarter for which consolidated
     financial statements of the Company are available preceding the date of
     such Restricted Payment, plus (b) 100% of the aggregate net cash proceeds
     received by the Company since the date hereof as a contribution to its
     common equity capital or from the issue or sale of Equity Interests of the
     Company (other than Disqualified Stock) or from the issue or sale of
     convertible or exchangeable Disqualified Stock or convertible or
     exchangeable debt securities of the Company that have been converted into
     or exchanged for such Equity Interests (other than Equity Interests (or
     Disqualified Stock or debt securities) sold to a Subsidiary of the
     Company), plus (c) to the extent that any Unrestricted Subsidiary is
     redesignated as a Restricted Subsidiary after the date hereof, the lesser
     of (i) the fair market value of the Company's Investment in such Subsidiary
     as of the date of such redesignation and (ii) such fair market value
     immediately prior to the time such Subsidiary was designated as an
     Unrestricted Subsidiary; plus (d) to the extent that any Restricted
     Investment that was made after the date hereof is sold for cash or
     otherwise liquidated or repaid for cash, the lesser of (i) the cash return
     of capital with respect to such Restricted Investment (less the cost of
     disposition, if any) and (ii) the initial amount of such Restricted
     Investment, minus (e) the aggregate principal amount of Indebtedness then
     outstanding which was incurred pursuant to clause (1)(b) of the definition
     of "Permitted Debt" in Section 4.09 hereof.

     So long as no Default has occurred and is continuing or would be caused
thereby, the foregoing provisions shall not prohibit, (1) the payment of any
dividend or other distribution within 60 days after the date of declaration
thereof, if at said date of declaration such payment would have complied with
the provisions of this Indenture, and such payment will be deemed to have been
paid on the date of declaration for purposes of the calculation in the foregoing
paragraph; (2) the redemption, repurchase, retirement, defeasance or other
acquisition of any subordinated Indebtedness of the Company or of any Equity
Interests of the Company in exchange for, or out of the net cash proceeds of the
substantially concurrent sale (other than to a Restricted Subsidiary of the
Company) of, Equity Interests of the Company (other than Disqualified Stock) and
cash payments in lieu of fractional interests not to exceed 1% of the Equity
Interests so redeemed, repurchased, retired, defeased or otherwise acquired;
provided that the amount of any such net cash proceeds that are utilized for any
such redemption, repurchase, retirement, defeasance or other acquisition shall
be excluded from clause (b) of the preceding paragraph; (3) the purchase,
redemption, defeasance or other acquisition or retirement for value of
subordinated Indebtedness of the Company in exchange for, or out of the net cash
proceeds of a substantially concurrent Incurrence (other than to a Restricted
Subsidiary of the Company) of Permitted Refinancing Indebtedness; (4) the
payment of any dividend by a Restricted Subsidiary of the Company to the holders
of its common Equity Interests on a pro rata basis; (5) the repurchase,
redemption or other acquisition or retirement for value of any Equity Interests
of the Company or any Restricted Subsidiary of the Company held by any member of
the Company's (or any of its Restricted Subsidiaries') management pursuant to
any management equity subscription agreement or stock option agreement in effect
as of the date hereof; provided that the aggregate price paid for all such
repurchased, redeemed, acquired or retired Equity Interests shall not exceed
$250,000 in any twelve-month period; (6) the purchase of any subordinated
Indebtedness at a purchase price not greater than 100% of the principal amount
or accreted value thereof, as the case may be, together with accrued interest,
if any, following an Asset Sale in accordance with provisions similar to those
contained in Section 4.10; provided, however, that prior to making any such
purchase the Company has made the Excess Proceeds Offer as provided in such
covenant with respect to the Notes and has purchased all Notes validly tendered
for payment in connection with such Excess Proceeds Offer; (7) making payments
to dissenting shareholders pursuant to applicable law in connection with a
consolidation or merger of the Company made in compliance with the provisions of
this Indenture; (8) Restricted Investments in an amount equal to 100% of Total
Incremental Equity since the date hereof determined as of the date any such
Restricted Investment is made, less the aggregate principal amount of
Indebtedness then outstanding which was incurred pursuant to clause (1)(b) of
the definition of "Permitted

                                       42
<PAGE>

Debt" set forth under Section 4.09 hereof;' (9) the purchase of (a) any
subordinated Indebtedness of the Company at a purchase price not greater than
101% of the principal amount or accreted value thereof, as the case may be,
together with accrued interest, if any, in the event of a Change of Control in
accordance with provisions similar to those of Section 4.14 or (b) any Preferred
Stock of the Company at a purchase price not greater than 101% of the
liquidation preference thereof, together with accrued dividends, if any, in the
event of a Change of Control in accordance with provisions similar to those of
Section 4.14; provided, however, that, in each case, prior to such purchase the
Company has made the Change of Control Offer as provided in this Indenture with
respect to the Notes and has purchased all Notes validly tendered for payment in
connection with such Change of Control Offer; (10) the payment of dividends to
Holdings the proceeds of which are used to satisfy ordinary course
administrative expenses of Holdings, but in no event to exceed $1.0 million in
any given fiscal year; and (11) the payment of any dividend required pursuant to
the Tax Sharing Agreement between the Company and Holdings, as such is in effect
on the date hereof.

     The amount of all Restricted Payments (other than cash) shall be the fair
market value on the date of the Restricted Payment of the asset(s) or securities
proposed to be transferred or issued to or by the Company or such Restricted
Subsidiary, as the case may be, pursuant to the Restricted Payment. The fair
market value of any assets or securities that are required to be valued by this
covenant shall be determined by the Board of Directors whose good faith
resolution with respect thereto shall be conclusive and shall be delivered to
the Trustee. The Board of Directors' determination must be based upon an opinion
or appraisal issued by an accounting, appraisal or investment banking firm of
national standing if the fair market value exceeds $20.0 million. Not later than
the date of making any Restricted Payment, the Company shall deliver to the
Trustee an Officers' Certificate stating that such Restricted Payment is
permitted and setting forth the basis upon which the calculations required by
this Section 4.07 were computed, together with a copy of any fairness opinion or
appraisal required by this Indenture.

Section 4.08.  Dividend and Other Payment Restrictions Affecting Restricted
Subsidiaries.

     The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, directly or indirectly, create or permit to exist or become
effective any consensual encumbrance or restriction on the ability of any
Restricted Subsidiary to (a) pay dividends or make any other distributions on
its Capital Stock to the Company or any of its Restricted Subsidiaries or with
respect to any other interest or participation in, or measured by, its profits
or pay any indebtedness owed to the Company or any of its Restricted
Subsidiaries, (b) make loans or advances to the Company or any of its Restricted
Subsidiaries, or (c) transfer any of its properties or assets to the Company or
any of its Restricted Subsidiaries, or (d) guarantee any Indebtedness of the
Company or any of its Restricted Subsidiaries.

     However, the preceding restrictions will not apply to encumbrances or
restrictions existing under or by reason of:

     (1)  Existing Indebtedness as in effect on the date hereof and any
amendments, modifications, restatements, renewals, increases, supplements,
refundings, replacements or refinancings thereof, provided that such amendments,
modifications, restatements, renewals, increases, supplements, refundings,
replacement or refinancings are no more restrictive, taken as a whole, with
respect to such dividend and other payment restrictions than those contained in
such Existing Indebtedness, as in effect on the date hereof;

     (2)  this Indenture and the Notes;

     (3)  applicable law;

                                       43
<PAGE>

     (4)  any instrument governing Indebtedness or Capital Stock of a Person
acquired by the Company or any of its Restricted Subsidiaries as in effect at
the time of such acquisition (except to the extent such Indebtedness was
incurred in connection with or in contemplation of such acquisition), which
encumbrance or restriction is not applicable to any Person, or the properties or
assets of any Person, other than the Person, or the property or assets of the
Person, so acquired, provided that, in the case of Indebtedness, such
Indebtedness was permitted by the terms of this Indenture to be incurred;

     (5)  customary non-assignment provisions in leases or contracts or real
property mortgages or related documents entered into in the ordinary course of
business and consistent with past practices;

     (6)  purchase money obligations, Capital Lease Obligations or mortgage
financings that impose restrictions on the property so acquired of the nature
described in clause (c) of the preceding paragraph;

     (7)  any agreement for the sale or other disposition of a Restricted
Subsidiary that restricts distributions by that Subsidiary pending its sale or
other disposition;

     (8)  Permitted Refinancing Indebtedness, provided that the restrictions
contained in the agreements governing such Permitted Refinancing Indebtedness
are no more restrictive, taken as a whole, than those contained in the
agreements governing the Indebtedness being refinanced;

     (9)  Liens securing Indebtedness that limit the right of the debtor to
dispose of the assets subject to such Lien;

     (10) provisions with respect to the disposition or distribution of assets
or property in joint venture agreements, asset sale agreements, stock sale
agreements and other similar agreements entered into in the ordinary course of
business; and

     (11) restrictions on cash or other deposits or net worth imposed by
customers under contracts entered into in the ordinary course of business.

Section 4.09.  Incurrence of Indebtedness and Issuance of Preferred Stock.

     The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, directly or indirectly, create, incur, issue, assume, guarantee
or otherwise become directly or indirectly liable, contingently or otherwise,
with respect to (collectively, "incur") any Indebtedness (including Acquired
Debt) and the Company shall not issue any Disqualified Stock; provided, however,
that the Company may incur Indebtedness or issue Disqualified Stock and a
Restricted Subsidiary may incur Acquired Debt if the ratio of Total Consolidated
Indebtedness to Adjusted Consolidated Operating Cash Flow for the Company's most
recently ended four full fiscal quarters for which internal financial statements
are available immediately preceding the date on which such additional
Indebtedness is incurred or such Disqualified Stock is issued would have been at
less than or equal to 6.0 to 1.0, determined on a pro forma basis (including a
pro forma application of the net proceeds therefrom), as if the additional
Indebtedness had been incurred, or the Disqualified Stock had been issued, as
the case may be, at the beginning of such four-quarter period.

     The Company shall not incur any Indebtedness (including Permitted Debt)
that is contractually subordinated in right of payment to any other Indebtedness
of the Company unless such Indebtedness is also contractually subordinated to
the Notes on substantially identical terms; provided, however, that no
Indebtedness of the Company shall be deemed to be contractually subordinated in
right of payment to any other Indebtedness of the Company solely by virtue of
being unsecured.

                                       44
<PAGE>

     The provisions of the first paragraph of this Section 4.09 shall not apply
to the incurrence of any of the following items of Indebtedness (collectively,
"Permitted Debt"):

          (i)    the incurrence by the Company of Pari Passu Indebtedness in an
     aggregate principal amount (including the aggregate principal amount of all
     Permitted Refinancing Indebtedness incurred to refund, refinance or replace
     any Indebtedness incurred pursuant to this clause (i)), which does not
     exceed: (a) $500.0 million plus the amount equal to 125% of Total
     Incremental Equity as of the date of such incurrence;

          (ii)   unsecured subordinated Indebtedness or Disqualified Stock of
     the Company incurred to finance the construction, expansion, development or
     acquisition of music libraries and other recorded music programming,
     furniture, fixtures and equipment (including satellites, ground stations
     and related equipment) if such subordinated Indebtedness or Disqualified
     Stock, as applicable, has a Weighted Average Life to Maturity longer than
     the Weighted Average Life to Maturity of the Notes and has a final Stated
     Maturity of principal later than the Stated Maturity of principal of the
     Notes;

          (iii)  unsecured subordinated Indebtedness or Disqualified Stock of
     the Company incurred after the Commercial Operations Commencement Date in
     an aggregate principal amount (or liquidation preference, as applicable)
     (including the aggregate principal amount (or liquidation preference, as
     applicable) of all Permitted Refinancing Indebtedness incurred to refund,
     refinance or replace any Indebtedness or Disqualified Stock, as applicable,
     incurred pursuant to this clause (iii)) at any time outstanding not to
     exceed the product of (a) $100.0 and (b) the number of Subscribers at such
     time if such subordinated Indebtedness or Disqualified Stock, a applicable,
     has a Weighted Average Life to Maturity longer than the Weighted Average
     Life to Maturity of the Notes and has a final Stated Maturity of principal
     later than the Stated Maturity of principal of the Notes;

          (iv)   the incurrence by the Company and its Restricted Subsidiaries
     of the Existing Indebtedness;

          (v)    the incurrence by the Company of Indebtedness represented by
     the Notes to be issued on the date hereof and the Exchange Notes to be
     issued pursuant to the Registration Rights Agreement;

          (vi)   the incurrence by the Company or any of its Restricted
     Subsidiaries of Indebtedness represented by Capital Lease Obligations,
     mortgage financings or purchase money obligations, in each case, incurred
     for the purpose of financing all or any part of the purchase price or cost
     of construction or improvement of property, plant or equipment used in the
     business of the Company or such Subsidiary, in an aggregate principal
     amount, including all Permitted Refinancing Indebtedness incurred to
     refund, refinance or replace any Indebtedness incurred pursuant to this
     clause (vi), not to exceed $30.0 million at any time outstanding;

          (vii)  the incurrence by the Company or any of its Restricted
     Subsidiaries of Permitted Refinancing Indebtedness in exchange for, or the
     net proceeds of which are used to refund, refinance or replace Indebtedness
     (other than intercompany Indebtedness) that was permitted by this Indenture
     to be incurred under the first paragraph of this covenant or clauses (i),
     (ii), (iii), (iv), (v), (vi), (vii), or (xii) of this paragraph;

          (viii) the incurrence by the Company or any of its Restricted
     Subsidiaries of intercompany Indebtedness between or among the Company and
     any of its Restricted

                                       45
<PAGE>

     Subsidiaries; provided, however, that: (a) if the Company is the obligor on
     such Indebtedness, such Indebtedness must be expressly subordinated to the
     prior payment in full in cash of all Obligations with respect to the Notes;
     and (b) (i) any subsequent issuance or transfer of Equity Interests that
     results in any such Indebtedness being held by a Person other than the
     Company or a Restricted Subsidiary thereof and (ii) any sale or other
     transfer of any such Indebtedness to a Person that is not either the
     Company or a Restricted Subsidiary thereof; shall be deemed, in each case,
     to constitute an incurrence of such Indebtedness by the Company or such
     Restricted Subsidiary, as the case may be, that was not permitted by this
     clause (viii);

          (ix)   the incurrence by the Company of Hedging Obligations that are
     incurred for the purpose of fixing or hedging (x) interest rate risk with
     respect to any floating rate Indebtedness that is permitted by the terms of
     this Indenture to be outstanding or (y) fluctuation in currency values;

          (x)    the accrual of interest, the accretion or amortization of
     original issue discount, the payment of interest on any Indebtedness in the
     form of additional Indebtedness with the same terms, and the payment of
     dividends on Disqualified Stock in the form of additional shares of the
     same class of Disqualified Stock will not be deemed to be an incurrence of
     Indebtedness or an issuance of Disqualified Stock for purposes of this
     covenant;

          (xi)   the incurrence by the Company of additional Indebtedness
     (including Acquired Debt) or Disqualified Stock in an aggregate principal
     amount (or liquidation preference or accreted value, as applicable) at any
     time outstanding, including all Permitted Refinancing Indebtedness incurred
     to refund, refinance or replace any Indebtedness or Disqualified Stock
     incurred pursuant to this clause (xi), not to exceed $30.0 million; and

          (xii)  Indebtedness the proceeds of which are utilized solely to
     finance working capital in an aggregate principal amount not to exceed the
     lesser of (a) $50.0 million and (b) 80% of Qualified Receivables.

     For purposes of determining compliance with this Section 4.09, in the event
that an item of Indebtedness meets the criteria of more than one of the
categories of Permitted Debt described in clauses (i) through (xii) above or is
entitled to be incurred pursuant to the first paragraph of this Section 4.09,
the Company shall, in its sole discretion, classify such item of Indebtedness in
any manner that complies with this Section 4.09 and such item of Indebtedness
shall be treated as having been incurred pursuant to only one of such clauses or
pursuant to the first paragraph of this Section 4.09.

Section 4.10.  Asset Sales.

     The Company shall not, and shall not permit any of its Restricted
Subsidiaries to consummate an Asset Sale unless (x) the Company (or the
Restricted Subsidiary, as the case may be) receives consideration at the time of
such Asset Sale at least equal to the fair market value of the assets or Equity
Interests sold or otherwise disposed of; (y) such fair market value shall be
determined by the Company's Board of Directors (whose good faith determination
shall be conclusive) and evidenced by a resolution of the Board of Directors set
forth in an Officers' Certificate delivered to the Trustee; and (z) at least 75%
of the consideration received therefor by the Company or such Restricted
Subsidiary is in the form of cash or Cash Equivalents; provided, however, that
the amount of (A) any liabilities (as shown on the Company's or such Restricted
Subsidiary's most recent balance sheet or in the notes thereto), of the Company
or any Restricted Subsidiary (other than contingent liabilities and liabilities
that are by their terms subordinated to the Notes or any guarantee thereof) that
are assumed by the transferee of any such assets pursuant to a customary
novation agreement that releases the Company or such Restricted

                                       46
<PAGE>

Subsidiary from further liability and (B) any securities, notes or other
obligations received by the Company or any such Restricted Subsidiary from such
transferee that are converted by the Company or such Restricted Subsidiary into
cash (to the extent of the cash received in that conversion) within 30 days of
receipt thereof, shall be deemed to be cash for purposes of this provision.

     A transfer of assets by the Company to a Wholly Owned Restricted Subsidiary
or by a Wholly Owned Restricted Subsidiary to the Company or to another Wholly
Owned Restricted Subsidiary, and an issuance of Equity Interests by a Wholly
Owned Restricted Subsidiary to the Company or to another Wholly Owned Restricted
Subsidiary, shall not be deemed to be an Asset Sale.  Any Restricted Payment
that is permitted by Section 4.07 hereof will not be deemed to be an Asset Sale.

     Within 360 days after the receipt of any Net Proceeds from an Asset Sale,
the Company may (a) apply the Net Proceeds from such Asset Sale, at its option,
(i) to acquire all or substantially all of the assets of, or a majority of the
Voting Stock of, another Permitted Business, or Voting Stock of a Restricted
Subsidiary engaged in a Permitted Business (other then any such Voting Stock
owned or held by a Restricted Subsidiary), (ii) to make a capital expenditure,
or (3) to acquire other assets that are used or useful in a Permitted Business
that have an expected useful life of one year or longer; (b) enter into a
legally binding agreement to apply such Net Proceeds as described in the
preceding clause (a) within six months after such agreement is entered into and
apply such Net Proceeds in accordance with the terms of such agreement or the
provisions of clause (a) above; provided that if such agreement terminates the
Company shall have until the earlier of (i) 90 days after the date of such
termination and (ii) six months after the date of the Asset Sale resulting in
such Net Proceeds to effect such an application; or (c) to permanently repay
(and reduce the commitments with respect to) Pari Passu Indebtedness.  Pending
the final application of any such Net Proceeds, the Company may temporarily
reduce revolving credit borrowings or otherwise invest such Net Proceeds in any
manner that is not prohibited by this Indenture. Any Net Proceeds from such
Asset Sale that are not finally applied or invested as provided in the first
sentence of this paragraph will be deemed to constitute "Excess Proceeds."
Within five days of each date on which the aggregate amount of Excess Proceeds
exceeds $10 million, the Company shall commence an Asset Sale Offer pursuant to
Section 3.09 hereof to all Holders of Notes and all holders of Indebtedness that
is pari passu with the Notes containing provisions similar to those set forth in
this Indenture with respect to offers to purchase or redeem with the proceeds of
sales of assets to purchase the maximum principal amount of Notes and such other
pari passu Indebtedness that may be purchased out of the Excess Proceeds at an
offer price in cash in an amount equal to 100% of the principal amount thereof
plus accrued and unpaid interest and Liquidated Damages, thereon, if any, to the
date fixed for the closing of such offer, in accordance with the procedures set
forth in Section 3.09 hereof.  To the extent that the aggregate amount of Notes
tendered pursuant to an Asset Sale Offer is less than the Excess Proceeds, the
Company may use such difference for any purpose not otherwise prohibited by this
Indenture.  If the aggregate principal amount of Notes and such other pari passu
Indebtedness tendered into such Asset Sale Offer exceeds the amount of Excess
Proceeds, the Trustee shall select the Notes and such other pari passu
Indebtedness to be purchased on a pro rata basis based on the principal amount
of Notes and such other pari passu Indebtedness tendered.  Upon completion of
each Asset Sale Offer, the amount of Excess Proceeds shall be deemed to be reset
at zero.

     The Company shall comply with the requirements of Rule 14e-1 under the
Exchange Act and any other securities laws and regulations thereunder to the
extent such laws and regulations are applicable in connection with each
repurchase of Notes pursuant to an Asset Sale Offer. To the extent that the
provisions of any securities laws or regulations conflict with the Asset Sales
provisions of this Indenture, the Company shall comply with the applicable
securities laws and regulations and shall not be deemed to have breached its
obligations under the Asset Sale provisions of this Indenture by virtue of such
conflict.

                                       47
<PAGE>

Section 4.11.  Transactions with Affiliates.

     The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, make any payment to, or sell, lease, transfer or otherwise
dispose of any of its properties or assets to, or purchase any property or
assets from, or enter into or make or amend any transaction, contract,
agreement, understanding, loan, advance or guarantee with, or for the benefit
of, any Affiliate (each, an ''Affiliate Transaction''), unless:  (a) such
Affiliate Transaction is on terms that are no less favorable to the Company or
the relevant Restricted Subsidiary than those that would have been obtained in a
comparable transaction by the Company or such Restricted Subsidiary with an
unrelated Person; and (b) the Company delivers to the Trustee (i) with respect
to any Affiliate Transaction or series of related Affiliate Transactions
involving aggregate consideration in excess of $5.0 million, a resolution of the
Board of Directors set forth in an Officers' Certificate certifying that such
Affiliate Transaction complies with this covenant and that such Affiliate
Transaction has been approved by a majority of the members of the Board of
Directors who are disinterested with respect to such Affiliate Transaction and
(ii) with respect to any Affiliate Transaction or series of related Affiliate
Transactions involving aggregate consideration in excess of $20.0 million, an
opinion as to the fairness to the Company or such Restricted Subsidiary of such
Affiliate Transaction from a financial point of view issued by an accounting,
appraisal or investment banking firm of national standing; provided however that
the following items shall not be deemed to be Affiliate Transactions and,
therefore, will not be subject to the provisions of this paragraph:

     (1)  any transaction by the Company or any Restricted Subsidiary with an
Affiliate directly related to the purchase, sale or distribution of products in
the ordinary course of business consistent with industry practice which has been
approved by a majority of the members of the Board of Directors who are
disinterested with respect to such transaction;

     (2)  any employment agreement or arrangement or employee benefit plan
entered into by the Company or any of its Restricted Subsidiaries in the
ordinary course of business of the Company or such Restricted Subsidiary;

     (3)  transactions between or among the Company and/or its Restricted
Subsidiaries;

     (4)  payment of reasonable directors fees and provisions of customary
indemnification to directors, officers and employees of the Company and its
Restricted Subsidiaries;

     (5)  sales of Equity Interests (other than Disqualified Stock) to
Affiliates of the Company;

     (6)  Restricted Payments that are permitted by the provisions of Section
4.07 hereof and under clauses (8) and (9) of the definition of "Permitted
Investments";

     (7)  transactions pursuant to the Tax Sharing Agreement; and

     (8)  contractual arrangements existing on the date hereof, and any
renewals, extensions, implementations or modifications thereof that are not
materially adverse to the Holders.

Section 4.12.  Liens.

     The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, create, incur, assume or otherwise cause or suffer to exist or
become effective any Lien of any kind (other than Permitted Liens) upon any of
their property or assets, now owned or hereafter acquired.

                                       48
<PAGE>

Section 4.13.  Corporate Existence.

     Subject to Article 5 hereof, the Company shall do or cause to be done all
things necessary to preserve and keep in full force and effect (i) its corporate
existence, and the corporate, partnership or other existence of each of its
Subsidiaries, in accordance with the respective organizational documents (as the
same may be amended from time to time) of the Company or any such Subsidiary and
(ii) the rights (charter and statutory), licenses and franchises of the Company
and its Subsidiaries; provided, however, that the Company shall not be required
to preserve any such right, license or franchise, or the corporate, partnership
or other existence of any of its Subsidiaries, if the Board of Directors shall
determine that the preservation thereof is no longer desirable in the conduct of
the business of the Company and its Subsidiaries, taken as a whole, and that the
loss thereof is not adverse in any material respect to the Holders of the Notes.

Section 4.14.  Offer to Repurchase Upon Change of Control.

     (a)  Upon the occurrence of a Change of Control, the Company shall make an
offer (a "Change of Control Offer") to each Holder to repurchase all or any part
(equal to $1,000 or an integral multiple thereof) of each Holder's Notes at a
purchase price equal to 101% of the aggregate principal amount thereof plus
accrued and unpaid interest and Liquidated Damages thereon, if any, to the date
of purchase (the "Change of Control Payment"). Within 30 days following any
Change of Control, the Company shall mail a notice to each Holder stating: (1)
that the Change of Control Offer is being made pursuant to this Section 4.14 and
that all Notes tendered will be accepted for payment; (2) the purchase price and
the purchase date, which shall be no earlier than 30 and no later than 60
calendar days from the date such notice is mailed (the "Change of Control
Payment Date"); (3) that any Note not tendered will continue to accrue interest;
(4) that, unless the Company defaults in the payment of the Change of Control
Payment, all Notes accepted for payment pursuant to the Change of Control Offer
shall cease to accrue interest after the Change of Control Payment Date; (5)
that Holders electing to have any Notes purchased pursuant to a Change of
Control Offer will be required to surrender the Notes, with the form entitled
"Option of Holder to Elect Purchase" on the reverse of the Notes completed, to
the Paying Agent at the address specified in the notice prior to the close of
business on the third Business Day preceding the Change of Control Payment Date;
(6) that Holders will be entitled to withdraw their election if the Paying Agent
receives, not later than the close of business on the second Business Day
preceding the Change of Control Payment Date, a telegram, telex, facsimile
transmission or letter setting forth the name of the Holder, the principal
amount of Notes delivered for purchase, and a statement that such Holder is
withdrawing his election to have the Notes purchased; and (7) that Holders whose
Notes are being purchased only in part will be issued new Notes equal in
principal amount to the unpurchased portion of the Notes surrendered, which
unpurchased portion must be equal to $1,000 in principal amount or an integral
multiple thereof. The Company shall comply with the requirements of Rule 14e-1
under the Exchange Act and any other securities laws and regulations thereunder
to the extent such laws and regulations are applicable in connection with the
repurchase of Notes in connection with a Change of Control. To the extent that
the provisions of any securities laws or regulations conflict with the Change of
Control provisions of this Indenture, the Company will comply with the
applicable securities laws and regulations and will not be deemed to have
breached its obligations under the Change of Control provisions of this
Indenture by virtue of such conflict.

     (b)  On the Change of Control Payment Date, the Company shall, to the
extent lawful, (1) accept for payment all Notes or portions thereof properly
tendered pursuant to the Change of Control Offer, (2) deposit with the Paying
Agent an amount equal to the Change of Control Payment in respect of all Notes
or portions thereof so tendered and (3) deliver or cause to be delivered to the
Trustee the Notes so accepted together with an Officers' Certificate stating the
aggregate principal amount of Notes or portions thereof being purchased by the
Company. The Paying Agent shall promptly mail to each Holder

                                       49
<PAGE>

of Notes so tendered the Change of Control Payment for such Notes, and the
Trustee shall promptly authenticate and mail (or cause to be transferred by book
entry) to each Holder a new Note equal in principal amount to any unpurchased
portion of the Notes surrendered by such Holder, if any; provided, that each
such new Note shall be in a principal amount of $1,000 or an integral multiple
thereof. The Company shall publicly announce the results of the Change of
Control Offer on or as soon as practicable after the Change of Control Payment
Date.

     (c)  The Company shall not be required to make a Change of Control Offer
upon a Change of Control if a third party makes the Change of Control Offer in
the manner, at the times and otherwise in compliance with the requirements set
forth in this Indenture applicable to a Change of Control Offer made by the
Company and purchases all Notes validly tendered and not withdrawn under such
Change of Control Offer.

Section 4.15.  Limitation on Sale and Leaseback Transactions.

     The Company shall not, and shall not permit any of its Restricted
Subsidiaries to, enter into any sale and leaseback transaction; provided that
the Company may enter into a sale and leaseback transaction if (i) the lease is
for a period, including renewal rights, of not in excess of five years; (ii) the
transaction is solely between the Company and any Restricted Subsidiary or
solely between Restricted Subsidiaries; or (iii) the Company or such Restricted
Subsidiary, within 12 months after the sale or transfer of any assets or
properties is completed, applies an amount not less than the Net Proceeds
received from such sale in accordance with Section 4.10 hereof.

Section 4.16.  Limitation on Issuances and Sales of Capital Stock of Wholly
Owned Subsidiaries.

     The Company (i) shall not, and shall not permit any of its Restricted
Subsidiaries to, transfer, convey, sell, lease or otherwise dispose of any
Equity Interests in any Restricted Subsidiary of the Company that owns, operates
or otherwise has the right to use Core XM Radio Assets to any Person and (ii)
shall not permit any Restricted Subsidiary of the Company to issue any of its
Equity Interests other than:

     (a)  to the Company or a Restricted Subsidiary of the Company;

     (b)  issuances of director's qualifying shares to the extent necessary to
comply with applicable law;

     (c)  to the extent required by applicable law, issuances or transfers to
nationals of the jurisdiction in which a Restricted Subsidiary is organized in
an amount not to exceed 1% of the total Equity Interests of such Restricted
Subsidiary;

     (d)  distributions of Capital Stock other than Disqualified Stock to all
common shareholders of a Restricted Subsidiary on a pro rata basis; or

     the sale of all the Equity Interests in such Restricted Subsidiary;
provided that the cash Net Proceeds from such transfer, conveyance, sale, lease
or other disposition are applied in accordance with Section 4.10 hereof.

Section 4.17.  Payments for Consent.

     Neither the Company nor any of its Subsidiaries shall, directly or
indirectly, pay or cause to be paid any consideration, whether by way of
interest, fee or otherwise, to any Holder of any Notes for or as

                                       50
<PAGE>

an inducement to any consent, waiver or amendment of any of the terms or
provisions of this Indenture or the Notes unless such consideration is offered
to be paid or is paid to all Holders of the Notes that consent, waive or agree
to amend in the time frame set forth in the solicitation documents relating to
such consent, waiver or agreement.

Section 4.18.  Insurance

     (a)  The Company shall obtain prior to the launch of each satellite and
shall maintain launch insurance with respect to each satellite launch covering
the period from the launch to 180 days following the launch of each satellite in
an amount equal to or greater than the sum of (1) the cost to replace such
satellite with a satellite of comparable or superior technological capability
(as determined by the Board of Directors, whose determination shall be
conclusive and evidenced by a Board Resolution) and having at least as much
transmission capacity as the satellite to be replaced, (2) the cost to launch a
replacement satellite pursuant to the contract whereby a replacement satellite
will be launched and (3) the cost of launch insurance for such replacement or,
in the event that the Company has reason to believe that the cost of obtaining
comparable insurance for a replacement would be materially higher, the Company's
best estimate of the cost of such comparable insurance. Notwithstanding the
foregoing, the Company shall not be obligated to maintain insurance pursuant to
this paragraph (a) with respect to (1) the launch of its first satellite and (2)
any subsequent launch not preceded by a launch failure or failure of any
satellite within 180 days from the date of its launch; provided, however, that
the Company's spare satellite shall be under construction in accordance with the
terms of the Hughes Satellite Contract or the Company shall have otherwise
obtained a spare satellite.

     (b)  The Company shall maintain full in-orbit insurance with respect to
each satellite it owns and launches in an amount at least equal to (1) the cost
to replace such satellite with a satellite of comparable or superior
technological capability (as determined by the Board of Directors, whose
determination shall be conclusive and evidenced by a Board Resolution) and
having at least as much transmission capacity as the satellite to be replaced,
(2) the cost to launch a replacement satellite pursuant to the contract pursuant
to which a replacement satellite will be launched and (3) the cost of launch
insurance for such replacement or, in the event that the Company has reason to
believe that the cost of obtaining comparable insurance for a replacement would
be materially higher, the Company's best estimate of the cost of such comparable
insurance. The in-orbit insurance required by this paragraph shall provide that
if 50% or more of a satellite's capacity is lost, the full amount of insurance
shall become due and payable, and that if a satellite is able to maintain more
than 50% but less than 100% of its capacity, a portion of such insurance shall
become due and payable.

     (c)  In the event that the Company receives proceeds from insurance
relating to any satellite, the Company shall be entitled to use all or a portion
of such proceeds to repay any vendor or third-party purchase money financing
pertaining to such satellite that is required to be repaid by reason of the loss
giving rise to such insurance proceeds. The Company shall use the remainder of
such proceeds to develop and construct a replacement satellite; provided,
however, that (1) such replacement satellite is of comparable or superior
technological capability as compared with the satellite being replaced and has
at least as much transmission capacity as the satellite being replaced (as
determined by the Board of Directors, whose determination shall be conclusive
and evidenced by a Board Resolution); (2) the Company will have sufficient funds
(together with the proceeds of any business interruption insurance) to service
the Company's projected debt service requirements until the scheduled launch of
the Company's spare satellite and for one year thereafter and to develop and
construct such replacement satellite; and (3) the Company's spare satellite is
scheduled to be launched within 12 months of the receipt of such proceeds. Any
such proceeds not used as permitted by this paragraph shall constitute Excess
Proceeds for purposes of the Asset Sale provisions of this Indenture.

                                       51
<PAGE>

                                  ARTICLE 5.
                                  SUCCESSORS

Section 5.01.  Merger, Consolidation, or Sale of Assets.

     The Company shall not, directly or indirectly, consolidate or merge with or
into (whether or not the Company is the surviving corporation), or sell, assign,
transfer, convey or otherwise dispose of all or substantially all of its
properties or assets of the Company and its Restricted Subsidiaries taken as a
whole, in one or more related transactions to, another Person unless (i) the
Company is the surviving corporation or the Person formed by or surviving any
such consolidation or merger (if other than the Company) or to which such sale,
assignment, transfer, conveyance or other disposition shall have been made is a
corporation organized or existing under the laws of the United States, any state
thereof or the District of Columbia, (ii) the Person formed by or surviving any
such consolidation or merger (if other than the Company) or the Person to which
such sale, assignment, transfer, conveyance or other disposition shall have been
made assumes all the obligations of the Company under the Registration Rights
Agreement, the Pledge Agreement, the Security Agreement, the Notes and this
Indenture pursuant to agreements in a form reasonably satisfactory to the
Trustee, (iii) immediately after such transaction, no Default or Event of
Default exists and (iv) the Company or the Person formed by or surviving any
such consolidation or merger (if other than the Company), or to which such sale,
assignment, transfer, conveyance or other disposition shall have been made (A)
shall have Consolidated Net Worth immediately after the transaction equal to or
greater than the Consolidated Net Worth of the Company immediately preceding the
transaction and (B) shall, on the date of such transaction after giving pro
forma effect thereto and any related financing transactions as if the same had
occurred at the beginning of the applicable four-quarter period, be permitted to
incur at least $1.00 of additional Indebtedness pursuant to the Total
Consolidated Indebtedness to Adjusted Consolidated Operating Cash Flow ratio
test set forth in clause (a) of the first paragraph of Section 4.09 hereof.  In
addition, the Company shall not, directly or indirectly, lease all or
substantially all of its properties or assets, in one or more related
transactions, to any other Person.  The provisions of this Section 5.01 shall
not be applicable to a sale, assignment, transfer, conveyance or other
disposition of assets between or among the Company and its Wholly Owned
Restricted Subsidiaries.

Section 5.02.  Successor Corporation Substituted.

     Upon any consolidation or merger, or any sale, assignment, transfer, lease,
conveyance or other disposition of all or substantially all of the assets of the
Company in accordance with Section 5.01 hereof, the successor corporation formed
by such consolidation or into or with which the Company is merged or to which
such sale, assignment, transfer, lease, conveyance or other disposition is made
shall succeed to, and be substituted for (so that from and after the date of
such consolidation, merger, sale, lease, conveyance or other disposition, the
provisions of this Indenture referring to the "Company" shall refer instead to
the successor corporation and not to the Company), and may exercise every right
and power of the Company under this Indenture with the same effect as if such
successor Person had been named as the Company herein; provided, however, that
the predecessor Company shall not be relieved from the obligation to pay the
principal of and interest on the Notes except in the case of a sale, assignment,
transfer, conveyance or other disposition of all of the Company's assets that
meets the requirements of Section 5.01 hereof.

                                       52
<PAGE>

                                  ARTICLE 6.
                             DEFAULTS AND REMEDIES

Section 6.01.  Events of Default.

     An "Event of Default" occurs if:

     (a)  the Company defaults in the payment when due of interest on, or
Liquidated Damages with respect to, the Notes and such default continues for a
period of 30 days;

     (b)  the Company defaults in the payment when due of principal of or
premium, if any, on the Notes when the same becomes due and payable at maturity,
upon redemption (including in connection with an offer to purchase) or
otherwise;

     (c)  the Company defaults in the performance, or breaches the provisions of
Section 5.01 hereof, the Company fails to make or consummate a Change of Control
Offer in accordance with the provisions of Section 4.14 hereof or the Company
fails to make or consummate an Asset Sale Offer in accordance with the
provisions of Section 4.10 hereof;

     (d)  the Company or any of its Restricted Subsidiaries fails to observe or
perform any other covenant or other agreement in this Indenture, the Notes, the
Security Agreement or the Pledge Agreement for 60 days after notice to the
Company by the Trustee or the Holders of at least 25% in aggregate principal
amount of the Notes (including Additional Notes, if any) then outstanding voting
as a single class;

     (e)  a default occurs under any mortgage, indenture or instrument under
which there may be issued or by which there may be secured or evidenced any
Indebtedness for money borrowed by the Company or any of its Restricted
Subsidiaries (or the payment of which is guaranteed by the Company or any of its
Restricted Subsidiaries), whether such Indebtedness or guarantee now exists, or
is created after the date hereof, which default results in the acceleration of
such Indebtedness prior to its express maturity or is caused by a failure to pay
principal of, or interest or premium, if any, on such Indebtedness prior to the
expiration of the grace period provided in such Indebtedness on the date of such
default (a "Payment Default") and, in each case, the principal amount of such
Indebtedness, together with the principal amount of any other such Indebtedness
under which there has been a Payment Default or the maturity of which has been
so accelerated, aggregates $10.0 million or more;

     (f)  a final nonappealable judgment or final nonappealable judgments for
the payment of money are entered by a court or courts of competent jurisdiction
against the Company or any of its Restricted Subsidiaries and such judgment or
judgments remain undischarged for a period (during which execution shall not be
effectively stayed) of 60 days, provided that the aggregate of all such
undischarged judgments exceeds $10.0 million (net of any amounts with respect to
which a reputable and creditworthy insurance company has acknowledged liability
in writing);

     (g)  the Company or any of its Significant Subsidiaries or any group of
Subsidiaries that, taken as a whole, would constitute a Significant Subsidiary
pursuant to or within the meaning of Bankruptcy Law:

          (i)   commences a voluntary case,

          (ii)  consents to the entry of an order for relief against it in an
     involuntary case,

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<PAGE>

          (iii) consents to the appointment of a custodian of it or for all or
     substantially all of its property,

          (iv)  makes a general assignment for the benefit of its creditors, or

          (v)   generally can not pay its debts as they become due; or

     (h)  a court of competent jurisdiction enters an order or decree under any
Bankruptcy Law that:

          (i)   is for relief against the Company or any of its Significant
     Subsidiaries or any group of Subsidiaries that, taken as a whole, would
     constitute a Significant Subsidiary in an involuntary case;

          (ii)  appoints a custodian of the Company or any of its Significant
     Subsidiaries or any group of Subsidiaries that, taken as a whole, would
     constitute a Significant Subsidiary or for all or substantially all of the
     property of the Company or any of its Significant Subsidiaries or any group
     of Subsidiaries that, taken as a whole, would constitute a Significant
     Subsidiary; or

          (iii) orders the liquidation of the Company or any of its Significant
     Subsidiaries or any group of Subsidiaries that, taken as a whole, would
     constitute a Significant Subsidiary;

and the order or decree remains unstayed and in effect for 60 consecutive days;
or

     (i)  the Company shall breach any material representation, warranty or
agreement set forth in the Pledge Agreement or the Security Agreement, the
Company shall repudiate any of its obligations under the Pledge Agreement or the
Security Agreement or the Pledge Agreement or the Security Agreement shall be
held in any judicial proceeding to be unenforceable or invalid or shall cease
for any reason to be in full force and effect.

Section 6.02.  Acceleration.

     If any Event of Default (other than an Event of Default specified in clause
(g) or (h) of Section 6.01 hereof with respect to the Company, any Significant
Subsidiary or any group of Significant Subsidiaries that, taken as a whole,
would constitute a Significant Subsidiary) occurs and is continuing, the Trustee
or the Holders of at least 25% in principal amount of the then outstanding Notes
may declare all the Notes to be due and payable immediately.  Upon any such
declaration, the Notes shall become due and payable immediately. Notwithstanding
the foregoing, if an Event of Default specified in clause (g) or (h) of Section
6.01 hereof occurs with respect to the Company, any of its Significant
Subsidiaries or any group of Subsidiaries that, taken as a whole, would
constitute a Significant Subsidiary, all outstanding Notes shall be due and
payable immediately without further action or notice.  The Holders of a majority
in aggregate principal amount of the then outstanding Notes by written notice to
the Trustee may on behalf of all of the Holders rescind an acceleration and its
consequences if the rescission would not conflict with any judgment or decree
and if all existing Events of Default (except nonpayment of principal, interest
or premium that has become due solely because of the acceleration) have been
cured or waived.

     If an Event of Default occurs by reason of any willful action (or inaction)
taken (or not taken) by or on behalf of the Company with the intention of
avoiding payment of the premium that the Company would have had to pay if the
Company then had elected to redeem the Notes pursuant to Section 3.07 hereof,
then, upon acceleration of the Notes, an equivalent premium shall also become
and be

                                       54
<PAGE>

immediately due and payable, to the extent permitted by law, anything in this
Indenture or in the Notes to the contrary notwithstanding. If an Event of
Default occurs prior to March 15, 2005 by reason of any willful action (or
inaction) taken (or not taken) by or on behalf of the Company with the intention
of avoiding the prohibition on redemption of the Notes prior to such date, then,
upon acceleration of the Notes, an additional premium shall also become and be
immediately due and payable in an amount, for each of the years beginning on
March 15 of the years set forth below, as set forth below (expressed as a
percentage of the principal amount of the Notes on the date of payment that
would otherwise be due but for the provisions of this sentence):

     Year                                                       Percentage
     ----                                                       ----------
     2000....................................................    114.000%
     2001....................................................    112.564%
     2002....................................................    111.147%
     2003....................................................    109.747%
     2004....................................................    108.365%

Section 6.03.  Other Remedies.

     If an Event of Default occurs and is continuing, the Trustee may pursue any
available remedy to collect the payment of principal, premium, if any, and
interest on the Notes or to enforce the performance of any provision of the
Notes or this Indenture.

     The Trustee may maintain a proceeding even if it does not possess any of
the Notes or does not produce any of them in the proceeding.  A delay or
omission by the Trustee or any Holder of a Note in exercising any right or
remedy accruing upon an Event of Default shall not impair the right or remedy or
constitute a waiver of or acquiescence in the Event of Default.  All remedies
are cumulative to the extent permitted by law.

Section 6.04.  Waiver of Past Defaults.

     Holders of not less than a majority in aggregate principal amount of the
then outstanding Notes by notice to the Trustee may on behalf of the Holders of
all of the Notes waive an existing Default or Event of Default and its
consequences hereunder, except a continuing Default or Event of Default in the
payment of the principal of, premium and Liquidated Damages, if any, or interest
on, the Notes (including in connection with an offer to purchase) (provided,
however, that the Holders of a majority in aggregate principal amount of the
then outstanding Notes may rescind an acceleration and its consequences,
including any related payment default that resulted from such acceleration).
Upon any such waiver, such Default shall cease to exist, and any Event of
Default arising therefrom shall be deemed to have been cured for every purpose
of this Indenture; but no such waiver shall extend to any subsequent or other
Default or impair any right consequent thereon.

Section 6.05.  Control by Majority.

     Holders of a majority in principal amount of the then outstanding Notes may
direct the time, method and place of conducting any proceeding for exercising
any remedy available to the Trustee or exercising any trust or power conferred
on it.  However, the Trustee may refuse to follow any direction that conflicts
with law or this Indenture that the Trustee determines may be unduly prejudicial
to the rights of other Holders of Notes or that may involve the Trustee in
personal liability.

                                       55
<PAGE>

Section 6.06.  Limitation on Suits.

     A Holder of a Note may pursue a remedy with respect to this Indenture or
the Notes only if:

     (a)  the Holder of a Note gives to the Trustee written notice of a
continuing Event of Default;

     (b)  the Holders of at least 25% in principal amount of the then
outstanding Notes make a written request to the Trustee to pursue the remedy;

     (c)  such Holder of a Note or Holders of Notes offer and, if requested,
provide to the Trustee indemnity satisfactory to the Trustee against any loss,
liability or expense;

     (d)  the Trustee does not comply with the request within 60 days after
receipt of the request and the offer and, if requested, the provision of
indemnity; and

     (e)  during such 60-day period the Holders of a majority in principal
amount of the then outstanding Notes do not give the Trustee a direction
inconsistent with the request.

     A Holder of a Note may not use this Indenture to prejudice the rights of
another Holder of a Note or to obtain a preference or priority over another
Holder of a Note.

Section 6.07.  Rights of Holders of Notes to Receive Payment.

     Notwithstanding any other provision of this Indenture, the right of any
Holder of a Note to receive payment of principal, premium and Liquidated
Damages, if any, and interest on the Note, on or after the respective due dates
expressed in the Note (including in connection with an offer to purchase), or to
bring suit for the enforcement of any such payment on or after such respective
dates, shall not be impaired or affected without the consent of such Holder;
provided that a Holder shall not have the right to institute any such suit for
the enforcement of payment if and to the extent that the institution or
prosecution thereof or the entry of judgment therein would, under applicable
law, result in the surrender, impairment, waiver or loss of the Lien of this
Indenture upon any property subject to such Lien.

Section 6.08.  Collection Suit by Trustee.

     If an Event of Default specified in Section 6.01(a) or (b) occurs and is
continuing, the Trustee is authorized to recover judgment in its own name and as
trustee of an express trust against the Company for the whole amount of
principal of, premium and Liquidated Damages, if any, and interest remaining
unpaid on the Notes and interest on overdue principal and, to the extent lawful,
interest and such further amount as shall be sufficient to cover the costs and
expenses of collection, including the reasonable compensation, expenses,
disbursements and advances of the Trustee, its agents and counsel.

Section 6.09.  Trustee May File Proofs of Claim.

     The Trustee is authorized to file such proofs of claim and other papers or
documents as may be necessary or advisable in order to have the claims of the
Trustee (including any claim for the reasonable compensation, expenses,
disbursements and advances of the Trustee, its agents and counsel) and the
Holders of the Notes allowed in any judicial proceedings relative to the Company
(or any other obligor upon the Notes), its creditors or its property and shall
be entitled and empowered to collect, receive and distribute any money or other
property payable or deliverable on any such claims and any custodian in any such
judicial proceeding is hereby authorized by each Holder to make such payments to
the Trustee, and in the event that the Trustee shall consent to the making of
such payments directly to the Holders, to

                                       56
<PAGE>

pay to the Trustee any amount due to it for the reasonable compensation,
expenses, disbursements and advances of the Trustee, its agents and counsel, and
any other amounts due the Trustee under Section 7.07 hereof. To the extent that
the payment of any such compensation, expenses, disbursements and advances of
the Trustee, its agents and counsel, and any other amounts due the Trustee under
Section 7.07 hereof out of the estate in any such proceeding, shall be denied
for any reason, payment of the same shall be secured by a Lien on, and shall be
paid out of, any and all distributions, dividends, money, securities and other
properties that the Holders may be entitled to receive in such proceeding
whether in liquidation or under any plan of reorganization or arrangement or
otherwise. Nothing herein contained shall be deemed to authorize the Trustee to
authorize or consent to or accept or adopt on behalf of any Holder any plan of
reorganization, arrangement, adjustment or composition affecting the Notes or
the rights of any Holder, or to authorize the Trustee to vote in respect of the
claim of any Holder in any such proceeding.

Section 6.10.  Priorities.

     If the Trustee collects any money pursuant to this Article, it shall pay
out the money in the following order:

          First:   to the Trustee, its agents and attorneys for amounts due
     under Section 7.07 hereof, including payment of all compensation, expense
     and liabilities incurred, and all advances made, by the Trustee and the
     costs and expenses of collection;

          Second:  to Holders of Notes for amounts due and unpaid on the Notes
     for principal, premium and Liquidated Damages, if any, and interest,
     ratably, without preference or priority of any kind, according to the
     amounts due and payable on the Notes for principal, premium and Liquidated
     Damages, if any and interest, respectively; and

          Third:   to the Company or to such party as a court of competent
     jurisdiction shall direct.

     The Trustee may fix a record date and payment date for any payment to
Holders of Notes pursuant to this Section 6.10.

Section 6.11.  Undertaking for Costs.

     In any suit for the enforcement of any right or remedy under this Indenture
or in any suit against the Trustee for any action taken or omitted by it as a
Trustee, a court in its discretion may require the filing by any party litigant
in the suit of an undertaking to pay the costs of the suit, and the court in its
discretion may assess reasonable costs, including reasonable attorneys' fees,
against any party litigant in the suit, having due regard to the merits and good
faith of the claims or defenses made by the party litigant.  This Section does
not apply to a suit by the Trustee, a suit by a Holder of a Note pursuant to
Section 6.07 hereof, or a suit by Holders of more than 10% in principal amount
of the then outstanding Notes.

                                  ARTICLE 7.
                                    TRUSTEE

Section 7.01.  Duties of Trustee.

     (a)  If an Event of Default has occurred and is continuing, the Trustee
shall exercise such of the rights and powers vested in it by this Indenture, and
use the same degree of care and skill in its

                                       57
<PAGE>

exercise, as a prudent person would exercise or use under the circumstances in
the conduct of such person's own affairs.

     (b)  Except during the continuance of an Event of Default:

          (i)  the duties of the Trustee shall be determined solely by the
     express provisions of this Indenture and the Trustee need perform only
     those duties that are specifically set forth in this Indenture and no
     others, and no implied covenants or obligations shall be read into this
     Indenture against the Trustee; and

          (ii) in the absence of bad faith on its part, the Trustee may
     conclusively rely, as to the truth of the statements and the correctness of
     the opinions expressed therein, upon certificates or opinions furnished to
     the Trustee and conforming to the requirements of this Indenture. However,
     the Trustee shall examine the certificates and opinions to determine
     whether or not they conform to the requirements of this Indenture.

     (c)  The Trustee may not be relieved from liabilities for its own negligent
     action, its own negligent failure to act, or its own willful misconduct,
     except that:

          (i)   this paragraph does not limit the effect of paragraph (b) of
     this Section;

          (ii)  the Trustee shall not be liable for any error of judgment made
     in good faith by a Responsible Officer, unless it is proved that the
     Trustee was negligent in ascertaining the pertinent facts; and

          (iii) the Trustee shall not be liable with respect to any action it
     takes or omits to take in good faith in accordance with a direction
     received by it pursuant to Section 6.05 hereof.

     (d)  Whether or not therein expressly so provided, every provision of this
Indenture that in any way relates to the Trustee is subject to paragraphs (a),
(b), and (c) of this Section.

     (e)  No provision of this Indenture shall require the Trustee to expend or
risk its own funds or incur any liability. The Trustee shall be under no
obligation to exercise any of its rights and powers under this Indenture at the
request of any Holders, unless such Holder shall have offered to the Trustee
security and indemnity satisfactory to it against any loss, liability or
expense.

     (f)  The Trustee shall not be liable for interest on any money received by
it except as the Trustee may agree in writing with the Company. Money held in
trust by the Trustee need not be segregated from other funds except to the
extent required by law.

Section 7.02.  Rights of Trustee.

     (a)  The Trustee may conclusively rely upon any document believed by it to
be genuine and to have been signed or presented by the proper Person. The
Trustee need not investigate any fact or matter stated in the document.

     (b)  Before the Trustee acts or refrains from acting, it may require an
Officers' Certificate or an Opinion of Counsel or both. The Trustee shall not be
liable for any action it takes or omits to take in good faith in reliance on
such Officers' Certificate or Opinion of Counsel. The Trustee may consult with
counsel and the advice of such counsel or any Opinion of Counsel shall be full
and complete

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<PAGE>

authorization and protection from liability in respect of any action taken,
suffered or omitted by it hereunder in good faith and in reliance thereon.

     (c)  The Trustee may act through its attorneys and agents and shall not be
responsible for the misconduct or negligence of any agent appointed with
due care.

     (d)  The Trustee shall not be liable for any action it takes or omits to
take in good faith that it believes to be authorized or within the rights or
powers conferred upon it by this Indenture.

     (e)  Unless otherwise specifically provided in this Indenture, any demand,
request, direction or notice from the Company shall be sufficient if signed
by an Officer of the Company.

     (f)  The Trustee shall be under no obligation to exercise any of the rights
or powers vested in it by this Indenture at the request or direction of any of
the Holders unless such Holders shall have offered to the Trustee reasonable
security or indemnity against the costs, expenses and liabilities that might be
incurred by it in compliance with such request or direction.

Section 7.03.  Individual Rights of Trustee.

     The Trustee in its individual or any other capacity may become the owner or
pledgee of Notes and may otherwise deal with the Company or any Affiliate of the
Company with the same rights it would have if it were not Trustee.  However, in
the event that the Trustee acquires any conflicting interest it must eliminate
such conflict within 90 days, apply to the SEC for permission to continue as
trustee or resign.  Any Agent may do the same with like rights and duties.  The
Trustee is also subject to Sections 7.10 and 7.11 hereof.

Section 7.04.  Trustee's Disclaimer.

     The Trustee shall not be responsible for and makes no representation as to
the validity or adequacy of this Indenture or the Notes, it shall not be
accountable for the Company's use of the proceeds from the Notes or any money
paid to the Company or upon the Company's direction under any provision of this
Indenture, it shall not be responsible for the use or application of any money
received by any Paying Agent other than the Trustee, and it shall not be
responsible for any statement or recital herein or any statement in the Notes or
any other document in connection with the sale of the Notes or pursuant to this
Indenture other than its certificate of authentication.

Section 7.05.  Notice of Defaults.

     If a Default or Event of Default occurs and is continuing and if it is
known to the Trustee, the Trustee shall mail to Holders of Notes a notice of the
Default or Event of Default within 90 days after it occurs.  Except in the case
of a Default or Event of Default in payment of principal of, premium, if any, or
interest on any Note, the Trustee may withhold the notice if and so long as a
committee of its Responsible Officers in good faith determines that withholding
the notice is in the interests of the Holders of the Notes.

Section 7.06.  Reports by Trustee to Holders of the Notes.

     Within 60 days after each May 15 beginning with the May 15 following the
date hereof, and for so long as Notes remain outstanding, the Trustee shall mail
to the Holders of the Notes a brief report dated as of such reporting date that
complies with TIA (S) 313(a) (but if no event described in TIA (S) 313(a) has
occurred within the twelve months preceding the reporting date, no report need
be transmitted).  The

                                       59
<PAGE>

Trustee also shall comply with TIA (S) 313(b)(2). The Trustee shall also
transmit by mail all reports as required by TIA (S) 313(c).

     A copy of each report at the time of its mailing to the Holders of Notes
shall be mailed to the Company and filed with the SEC and each stock exchange on
which the Notes are listed in accordance with TIA (S) 313(d).  The Company shall
promptly notify the Trustee when the Notes are listed on any stock exchange.

Section 7.07.  Compensation and Indemnity.

     The Company shall pay to the Trustee from time to time reasonable
compensation for its acceptance of this Indenture and services hereunder.  The
Trustee's compensation shall not be limited by any law on compensation of a
trustee of an express trust.  The Company shall reimburse the Trustee promptly
upon request for all reasonable disbursements, advances and expenses incurred or
made by it in addition to the compensation for its services.  Such expenses
shall include the reasonable compensation, disbursements and expenses of the
Trustee's agents and counsel.

     The Company shall indemnify the Trustee against any and all losses,
liabilities or expenses incurred by it arising out of or in connection with the
acceptance or administration of its duties under this Indenture, including the
reasonable costs and expenses of enforcing this Indenture against the Company
(including this Section 7.07) and defending itself against any claim (whether
asserted by the Company or any Holder or any other person) or liability in
connection with the exercise or performance of any of its powers or duties
hereunder, except to the extent any such loss, liability or expense may be
attributable to its negligence or bad faith.  The Trustee shall notify the
Company promptly of any claim for which it may seek indemnity.  Failure by the
Trustee to so notify the Company shall not relieve the Company of its
obligations hereunder.  The Company shall defend the claim and the Trustee shall
cooperate in the defense.  The Trustee may have separate counsel and the Company
shall pay the reasonable fees and expenses of such counsel.  The Company need
not pay for any settlement made without its consent, which consent shall not be
unreasonably withheld.

     The obligations of the Company under this Section 7.07 shall survive the
satisfaction and discharge of this Indenture.

     To secure the Company's payment obligations in this Section, the Trustee
shall have a Lien prior to the Notes on all money or property held or collected
by the Trustee, except that held in trust to pay principal and interest on
particular Notes.  Such Lien shall survive the satisfaction and discharge of
this Indenture.

     When the Trustee incurs expenses or renders services after an Event of
Default specified in Section 6.01(g) or (h) hereof occurs, the expenses and the
compensation for the services (including the fees and expenses of its agents and
counsel) are intended to constitute expenses of administration under any
Bankruptcy Law.

     The Trustee shall comply with the provisions of TIA (S) 313(b)(2) to the
extent applicable.

Section 7.08.  Replacement of Trustee.

     A resignation or removal of the Trustee and appointment of a successor
Trustee shall become effective only upon the successor Trustee's acceptance of
appointment as provided in this Section.

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<PAGE>

     The Trustee may resign in writing at any time and be discharged from the
trust hereby created by so notifying the Company.  The Holders of a majority in
principal amount of the then outstanding Notes may remove the Trustee by so
notifying the Trustee and the Company in writing.  The Company may remove the
Trustee if:

     (a)  the Trustee fails to comply with Section 7.10 hereof;

     (b)  the Trustee is adjudged a bankrupt or an insolvent or an order for
relief is entered with respect to the Trustee under any Bankruptcy Law;

     (c)  a custodian or public officer takes charge of the Trustee or its
property; or

     (d)  the Trustee becomes incapable of acting.

     If the Trustee resigns or is removed or if a vacancy exists in the office
of Trustee for any reason, the Company shall promptly appoint a successor
Trustee.  Within one year after the successor Trustee takes office, the Holders
of a majority in principal amount of the then outstanding Notes may appoint a
successor Trustee to replace the successor Trustee appointed by the Company.

     If a successor Trustee does not take office within 60 days after the
retiring Trustee resigns or is removed, the retiring Trustee, the Company, or
the Holders of at least 10% in principal amount of the then outstanding Notes
may petition any court of competent jurisdiction for the appointment of a
successor Trustee.

     If the Trustee, after written request by any Holder who has been a Holder
for at least six months, fails to comply with Section 7.10, such Holder may
petition any court of competent jurisdiction for the removal of the Trustee and
the appointment of a successor Trustee.

     A successor Trustee shall deliver a written acceptance of its appointment
to the retiring Trustee and to the Company.  Thereupon, the resignation or
removal of the retiring Trustee shall become effective, and the successor
Trustee shall have all the rights, powers and duties of the Trustee under this
Indenture.  The successor Trustee shall mail a notice of its succession to
Holders.  The retiring Trustee shall promptly transfer all property held by it
as Trustee to the successor Trustee, provided all sums owing to the Trustee
hereunder have been paid and subject to the Lien provided for in Section 7.07
hereof.  Notwithstanding replacement of the Trustee pursuant to this Section
7.08, the Company's obligations under Section 7.07 hereof shall continue for the
benefit of the retiring Trustee.

Section 7.09.  Successor Trustee by Merger, etc.

     If the Trustee consolidates, merges or converts into, or transfers all or
substantially all of its corporate trust business to, another corporation, the
successor corporation without any further act shall be the successor Trustee.

Section 7.10.  Eligibility; Disqualification.

     There shall at all times be a Trustee hereunder that is a corporation
organized and doing business under the laws of the United States of America or
of any state thereof that is authorized under such laws to exercise corporate
trustee power, that is subject to supervision or examination by federal or state
authorities and that has a combined capital and surplus of at least $100 million
as set forth in its most recent published annual report of condition.

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<PAGE>

     This Indenture shall always have a Trustee who satisfies the requirements
of TIA (S) 310(a)(1), (2) and (5).  The Trustee is subject to TIA (S) 310(b).

Section 7.11.  Preferential Collection of Claims Against Company.

     The Trustee is subject to TIA (S) 311(a), excluding any creditor
relationship listed in TIA (S) 311(b). A Trustee who has resigned or been
removed shall be subject to TIA (S) 311(a) to the extent indicated therein.

                                  ARTICLE 8.
                   LEGAL DEFEASANCE AND COVENANT DEFEASANCE

Section 8.01.  Option to Effect Legal Defeasance or Covenant Defeasance.

     The Company may, at the option of its Board of Directors evidenced by a
resolution set forth in an Officers' Certificate, at any time, elect to have
either Section 8.02 or 8.03 hereof be applied to all outstanding Notes upon
compliance with the conditions set forth below in this Article Eight.

Section 8.02.  Legal Defeasance and Discharge.

     Upon the Company's exercise under Section 8.01 hereof of the option
applicable to this Section 8.02, the Company shall, subject to the satisfaction
of the conditions set forth in Section 8.04 hereof, be deemed to have been
discharged from its obligations with respect to all outstanding Notes on the
date the conditions set forth below are satisfied (hereinafter, "Legal
Defeasance").  For this purpose, Legal Defeasance means that the Company shall
be deemed to have paid and discharged the entire Indebtedness represented by the
outstanding Notes, which shall thereafter be deemed to be "outstanding" only for
the purposes of Section 8.05 hereof and the other Sections of this Indenture
referred to in (a) and (b) below, and to have satisfied all its other
obligations under such Notes and this Indenture (and the Trustee, on demand of
and at the expense of the Company, shall execute proper instruments
acknowledging the same), except for the following provisions which shall survive
until otherwise terminated or discharged hereunder:  (a) the rights of Holders
of outstanding Notes to receive solely from the trust fund described in Section
8.04 hereof, and as more fully set forth in such Section, payments in respect of
the principal of, premium, if any, and interest on such Notes when such payments
are due, (b) the Company's obligations with respect to such Notes under Article
2 and Section 4.02 hereof, (c) the rights, powers, trusts, duties and immunities
of the Trustee hereunder and the Company's obligations in connection therewith
and (d) this Article Eight.  Subject to compliance with this Article Eight, the
Company may exercise its option under this Section 8.02 notwithstanding the
prior exercise of its option under Section 8.03 hereof.

Section 8.03.  Covenant Defeasance.

     Upon the Company's exercise under Section 8.01 hereof of the option
applicable to this Section 8.03, the Company shall, subject to the satisfaction
of the conditions set forth in Section 8.04 hereof, be released from its
obligations under the covenants contained in Sections 3.09, 4.07, 4.08, 4.09,
4.10, 4.11, 4.12, 4.14, 4.15, 4.16, 4.17 and 4.18 hereof and clause (iv) of
Section 5.01 hereof with respect to the outstanding Notes on and after the date
the conditions set forth in Section 8.04 are satisfied (hereinafter, "Covenant
Defeasance"), and the Notes shall thereafter be deemed not "outstanding" for the
purposes of any direction, waiver, consent or declaration or act of Holders (and
the consequences of any thereof) in connection with such covenants, but shall
continue to be deemed "outstanding" for all other purposes hereunder (it being
understood that such Notes shall not be deemed outstanding for accounting
purposes).  For this purpose, Covenant Defeasance means that, with respect to
the outstanding Notes, the Company may omit to comply with and shall have no
liability in respect of any term, condition or limitation set

                                       62
<PAGE>

forth in any such covenant, whether directly or indirectly, by reason of any
reference elsewhere herein to any such covenant or by reason of any reference in
any such covenant to any other provision herein or in any other document and
such omission to comply shall not constitute a Default or an Event of Default
under Section 6.01 hereof, but, except as specified above, the remainder of this
Indenture and such Notes shall be unaffected thereby. In addition, upon the
Company's exercise under Section 8.01 hereof of the option applicable to this
Section 8.03 hereof, subject to the satisfaction of the conditions set forth in
Section 8.04 hereof, Sections 6.01(c) through 6.01(f) hereof shall not
constitute Events of Default.

Section 8.04.  Conditions to Legal or Covenant Defeasance.

     The following shall be the conditions to the application of either Section
8.02 or 8.03 hereof to the outstanding Notes:

     In order to exercise either Legal Defeasance or Covenant Defeasance:

     (a)  the Company must irrevocably deposit with the Trustee, in trust, for
the benefit of the Holders, cash in United States dollars, non-callable
Government Securities, or a combination thereof, in such amounts as will be
sufficient, in the opinion of a nationally recognized firm of independent public
accountants, to pay the principal of, or interest and premium and Liquidated
Damages, if any, on the outstanding Notes on the stated date for payment thereof
or on the applicable redemption date, as the case may be and the Company must
specify whether the Notes are being defeased to maturity or to a particular
redemption date;

     (b)  in the case of an election under Section 8.02 hereof, the Company
shall have delivered to the Trustee an Opinion of Counsel in the United States
reasonably acceptable to the Trustee confirming that (A) the Company has
received from, or there has been published by, the Internal Revenue Service a
ruling or (B) since the date hereof, there has been a change in the applicable
federal income tax law, in either case to the effect that, and based thereon
such Opinion of Counsel shall confirm that, the Holders of the outstanding Notes
will not recognize income, gain or loss for federal income tax purposes as a
result of such Legal Defeasance and will be subject to federal income tax on the
same amounts, in the same manner and at the same times as would have been the
case if such Legal Defeasance had not occurred;

     (c)  in the case of an election under Section 8.03 hereof, the Company
shall have delivered to the Trustee an Opinion of Counsel in the United States
reasonably acceptable to the Trustee confirming that the Holders of the
outstanding Notes will not recognize income, gain or loss for federal income tax
purposes as a result of such Covenant Defeasance and will be subject to federal
income tax on the same amounts, in the same manner and at the same times as
would have been the case if such Covenant Defeasance had not occurred;

     (d)  no Default or Event of Default shall have occurred and be continuing
on the date of such deposit (other than a Default or Event of Default resulting
from the incurrence of Indebtedness all or a portion of the proceeds of which
will be used to defease the Notes pursuant to this Article Eight concurrently
with such incurrence) or insofar as Sections 6.01(g) or 6.01(h) hereof is
concerned, at any time in the period ending on the 91st day after the date of
deposit;

     (e)  such Legal Defeasance or Covenant Defeasance shall not result in a
breach or violation of, or constitute a default under, any material agreement or
instrument (other than this Indenture) to which the Company or any of its
Subsidiaries is a party or by which the Company or any of its Subsidiaries is
bound;

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<PAGE>

     (f)  the Company shall have delivered to the Trustee an Opinion of Counsel
(which may be subject to customary exceptions including, but not limited to the
assumption that there is no intervening bankruptcy of the Company between the
date of deposit and the 91st day following the deposit and the assumption that
no Holder is an "insider" of the Company under applicable bankruptcy law) to the
effect that on the 91st day following the deposit, the trust funds will not be
subject to the effect of any applicable bankruptcy, insolvency, reorganization
or similar laws affecting creditors' rights generally;

     (g)  the Company shall have delivered to the Trustee an Officers'
Certificate stating that the deposit was not made by the Company with the intent
of preferring the Holders over any other creditors of the Company or with the
intent of defeating, hindering, delaying or defrauding any other creditors of
the Company; and

     (h)  the Company shall have delivered to the Trustee an Officers'
Certificate and an Opinion of Counsel, each stating that all conditions
precedent provided for or relating to the Legal Defeasance or the Covenant
Defeasance have been complied with.

Section 8.05.  Deposited Money and Government Securities to be Held in Trust;
               Other Miscellaneous Provisions.

     Subject to Section 8.06 hereof, all money and non-callable Government
Securities (including the proceeds thereof) deposited with the Trustee (or other
qualifying trustee, collectively for purposes of this Section 8.05, the
"Trustee") pursuant to Section 8.04 hereof in respect of the outstanding Notes
shall be held in trust and applied by the Trustee, in accordance with the
provisions of such Notes and this Indenture, to the payment, either directly or
through any Paying Agent (including the Company acting as Paying Agent) as the
Trustee may determine, to the Holders of such Notes of all sums due and to
become due thereon in respect of principal, premium, if any, and interest, but
such money need not be segregated from other funds except to the extent required
by law.

     The Company shall pay and indemnify the Trustee against any tax, fee or
other charge imposed on or assessed against the cash or non-callable Government
Securities deposited pursuant to Section 8.04 hereof or the principal and
interest received in respect thereof other than any such tax, fee or other
charge which by law is for the account of the Holders of the outstanding Notes.

     Anything in this Article Eight to the contrary notwithstanding, the Trustee
shall deliver or pay to the Company from time to time upon the request of the
Company any money or non-callable Government Securities held by it as provided
in Section 8.04 hereof which, in the opinion of a nationally recognized firm of
independent public accountants expressed in a written certification thereof
delivered to the Trustee (which may be the opinion delivered under Section
8.04(a) hereof), are in excess of the amount thereof that would then be required
to be deposited to effect an equivalent Legal Defeasance or Covenant Defeasance.

Section 8.06.  Repayment to Company.

     Any money deposited with the Trustee or any Paying Agent, or then held by
the Company, in trust for the payment of the principal of, premium, if any, or
interest on any Note and remaining unclaimed for two years after such principal,
and premium, if any, or interest has become due and payable shall be paid to the
Company on its request or (if then held by the Company) shall be discharged from
such trust; and the Holder of such Note shall thereafter look only to the
Company for payment thereof, and all liability of the Trustee or such Paying
Agent with respect to such trust money, and all liability of the Company as
trustee thereof, shall thereupon cease; provided, however, that the Trustee or
such Paying Agent, before being required to make any such repayment, may at the
expense of the Company cause to

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<PAGE>

be published once, in the New York Times and The Wall Street Journal (national
edition), notice that such money remains unclaimed and that, after a date
specified therein, which shall not be less than 30 days from the date of such
notification or publication, any unclaimed balance of such money then remaining
will be repaid to the Company.

Section 8.07.  Reinstatement.

     If the Trustee or Paying Agent is unable to apply any United States dollars
or non-callable Government Securities in accordance with Section 8.02 or 8.03
hereof, as the case may be, by reason of any order or judgment of any court or
governmental authority enjoining, restraining or otherwise prohibiting such
application, then the Company's obligations under this Indenture and the Notes
shall be revived and reinstated as though no deposit had occurred pursuant to
Section 8.02 or 8.03 hereof until such time as the Trustee or Paying Agent is
permitted to apply all such money in accordance with Section 8.02 or 8.03
hereof, as the case may be; provided, however, that, if the Company makes any
payment of principal of, premium, if any, or interest on any Note following the
reinstatement of its obligations, the Company shall be subrogated to the rights
of the Holders of such Notes to receive such payment from the money held by the
Trustee or Paying Agent.

                                  ARTICLE 9.
                       AMENDMENT, SUPPLEMENT AND WAIVER

Section 9.01.  Without Consent of Holders of Notes.

     Notwithstanding Section 9.02 of this Indenture, the Company and the Trustee
may amend or supplement this Indenture or the Notes without the consent of any
Holder of a Note:

     (a)  to cure any ambiguity, defect or inconsistency;

     (b)  to provide for uncertificated Notes in addition to or in place of
certificated Notes or to alter the provisions of Article 2 hereof (including the
related definitions) in a manner that does not materially adversely affect any
Holder;

     (c)  to provide for the assumption of the Company's obligations to the
Holders of the Notes by a successor to the Company pursuant to Article 5 hereof;

     (d)  to make any change that would provide any additional rights or
benefits to the Holders of the Notes or that does not adversely affect the legal
rights hereunder of any Holder of the Note;

     (e)  to comply with requirements of the SEC or in order to effect or
maintain the qualification of this Indenture under the TIA; or

     (f)  to provide for the issuance of Additional Notes in accordance with the
limitations set forth in this Indenture as of the date hereof.

     Upon the request of the Company accompanied by a resolution of its Board of
Directors authorizing the execution of any such amended or supplemental
Indenture, and upon receipt by the Trustee of the documents described in Section
7.02 hereof, the Trustee shall join with the Company in the execution of any
amended or supplemental Indenture authorized or permitted by the terms of this
Indenture and to make any further appropriate agreements and stipulations that
may be therein contained, but the Trustee shall not be obligated to enter into
such amended or supplemental Indenture that affects its own rights, duties or
immunities under this Indenture or otherwise.

                                       65
<PAGE>

Section 9.02.  With Consent of Holders of Notes.

     Except as provided below in this Section 9.02, the Company and the Trustee
may amend or supplement this Indenture (including Section 3.09, 4.10 and 4.14
hereof), the Notes, the Pledge Agreement and the Security Agreement with the
consent of the Holders of at least a majority in principal amount of the Notes
(including Additional Notes, if any) then outstanding voting as a single class
(including, without limitation, consents obtained in connection with a tender
offer or exchange offer for, or purchase of, the Notes), and, subject to
Sections 6.04 and 6.07 hereof, any existing Default or Event of Default (other
than a Default or Event of Default in the payment of the principal of, premium,
if any, or interest on the Notes, except a payment default resulting from an
acceleration that has been rescinded) or compliance with any provision of this
Indenture or the Notes may be waived with the consent of the Holders of a
majority in principal amount of the then outstanding Notes (including Additional
Notes, if any) voting as a single class (including consents obtained in
connection with a tender offer or exchange offer for, or purchase of, the
Notes).

     Upon the request of the Company accompanied by a resolution of its Board of
Directors authorizing the execution of any such amended or supplemental
Indenture, and upon the filing with the Trustee of evidence satisfactory to the
Trustee of the consent of the Holders of Notes as aforesaid, and upon receipt by
the Trustee of the documents described in Section 7.02 hereof, the Trustee shall
join with the Company in the execution of such amended or supplemental Indenture
unless such amended or supplemental Indenture directly affects the Trustee's own
rights, duties or immunities under this Indenture or otherwise, in which case
the Trustee may in its discretion, but shall not be obligated to, enter into
such amended or supplemental Indenture.

     It shall not be necessary for the consent of the Holders of Notes under
this Section 9.02 to approve the particular form of any proposed amendment or
waiver, but it shall be sufficient if such consent approves the substance
thereof.

     After an amendment, supplement or waiver under this Section becomes
effective, the Company shall mail to the Holders of Notes affected thereby a
notice briefly describing the amendment, supplement or waiver.  Any failure of
the Company to mail such notice, or any defect therein, shall not, however, in
any way impair or affect the validity of any such amended or supplemental
Indenture or waiver.  Subject to Sections 6.04 and 6.07 hereof, the Holders of a
majority in aggregate principal amount of the Notes  (including Additional
Notes, if any) then outstanding voting as a single class may waive compliance in
a particular instance by the Company with any provision of this Indenture or the
Notes.  However, without the consent of each Holder affected, an amendment or
waiver under this Section 9.02 may not (with respect to any Notes held by a non-
consenting Holder):

     (a)  reduce the principal amount of Notes whose Holders must consent to an
amendment, supplement or waiver;

     (b)  reduce the principal of or change the fixed maturity of any Note or
alter or waive any of the provisions with respect to the redemption of the Notes
except as provided above with respect to Sections 3.09, 4.10 and 4.14 hereof;

     (c)  reduce the rate of or change the time for payment of interest,
including default interest, on any Note;

     (d)  waive a Default or Event of Default in the payment of principal of or
premium, if any, or interest on the Notes (except a rescission of acceleration
of the Notes by the Holders of at least a majority

                                       66
<PAGE>

in aggregate principal amount of the then outstanding Notes (including
Additional Notes, if any) and a waiver of the payment default that resulted from
such acceleration);

     (e)  make any Note payable in money other than that stated in the Notes;

     (f)  make any change in the provisions of this Indenture relating to
waivers of past Defaults or the rights of Holders of Notes to receive payments
of principal of or interest or premium or Liquidated Damages, if any, on the
Notes;

     (g)  waive a redemption payment with respect to any Note other than a
payment required by Sections 3.09, 4.10 and 4.14 hereof; or

     (h)  release any portion of the Collateral or the Cash Collateral from the
Lien of the Security Agreement or the Pledge Agreement, except in accordance
with the terms thereof; or

     (i)  make any change in Section 6.04 or 6.07 hereof or in the foregoing
amendment and waiver provisions.

Section 9.03.  Compliance with Trust Indenture Act.

     Every amendment or supplement to this Indenture or the Notes shall be set
forth in a amended or supplemental Indenture that complies with the TIA as then
in effect.

Section 9.04.  Revocation and Effect of Consents.

     Until an amendment, supplement or waiver becomes effective, a consent to it
by a Holder of a Note is a continuing consent by the Holder of a Note and every
subsequent Holder of a Note or portion of a Note that evidences the same debt as
the consenting Holder's Note, even if notation of the consent is not made on any
Note.  However, any such Holder of a Note or subsequent Holder of a Note may
revoke the consent as to its Note if the Trustee receives written notice of
revocation before the date the waiver, supplement or amendment becomes
effective.  An amendment, supplement or waiver becomes effective in accordance
with its terms and thereafter binds every Holder.

Section 9.05.  Notation on or Exchange of Notes.

     The Trustee may place an appropriate notation about an amendment,
supplement or waiver on any Note thereafter authenticated. The Company in
exchange for all Notes may issue and the Trustee shall, upon receipt of an
Authentication Order, authenticate new Notes that reflect the amendment,
supplement or waiver.

     Failure to make the appropriate notation or issue a new Note shall not
affect the validity and effect of such amendment, supplement or waiver.

Section 9.06.  Trustee to Sign Amendments, etc.

     The Trustee shall sign any amended or supplemental Indenture authorized
pursuant to this Article Nine if the amendment or supplement does not adversely
affect the rights, duties, liabilities or immunities of the Trustee.  The
Company may not sign an amendment or supplemental Indenture until the Board of
Directors approves it.  In executing any amended or supplemental indenture, the
Trustee shall be entitled to receive and (subject to Section 7.01 hereof) shall
be fully protected in relying upon, in addition to the documents required by
Section 13.04 hereof, an Officer's Certificate and an Opinion of Counsel stating

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<PAGE>

that the execution of such amended or supplemental indenture is authorized or
permitted by this Indenture.

                                  ARTICLE 10.
                              SECURITY AGREEMENT

Section 10.01.  Security Agreement.

     The due and punctual payment of the principal of and interest and
Liquidated Damages, if any, on the Notes when and as the same shall be due and
payable, whether on an interest payment date, at maturity, by acceleration,
repurchase, redemption or otherwise, and interest on the overdue principal of
and interest and Liquidated Damages (to the extent permitted by law), if any, on
the Notes and performance of all other obligations of the Company to the Holders
of Notes or the Trustee under this Indenture and the Notes, according to the
terms hereunder or thereunder, shall be secured as provided in the Security
Agreement which the Company has entered into simultaneously with the execution
of this Indenture and which is attached as Exhibit E hereto.  Each Holder of
Notes, by its acceptance thereof, consents and agrees to the terms of the
Security Agreement (including, without limitation, the provisions providing for
foreclosure and release of Collateral) as the same may be in effect or may be
amended from time to time in accordance with its terms and authorizes and
directs the Collateral Agent to enter into the Security Agreement and to perform
its obligations and exercise its rights thereunder in accordance therewith.  The
Company shall deliver to the Trustee copies of all documents delivered to the
Collateral Agent pursuant to the Security Agreement, and shall do or cause to be
done all such acts and things as may be necessary or proper, or as may be
required by the provisions of the Security Agreement, to assure and confirm to
the Trustee and the Security Agent the security interest in the Collateral
contemplated hereby, by the Security Agreement or any part thereof, as from time
to time constituted, so as to render the same available for the security and
benefit of this Indenture and of the Notes secured hereby, according to the
intent and purposes herein expressed.  The Company shall take, or shall cause
its Subsidiaries to take, upon request of the Trustee, any and all actions
reasonably required to cause the Security Agreement to create and maintain, as
security for the Obligations of the Company hereunder, a valid and enforceable
perfected first priority Lien in and on all the Security Collateral, in favor of
the Collateral Agent for the benefit of the Holders of Notes, superior to and
prior to the rights of all third Persons and subject to no other Liens than
Permitted Liens.

Section 10.02.  Recording and Opinions.

     (a)  The Company shall furnish to the Trustee simultaneously with the
execution and delivery of this Indenture an Opinion of Counsel either (i)
stating that in the opinion of such counsel all action has been taken with
respect to the recording, registering and filing of this Indenture, financing
statements or other instruments necessary to make effective the Lien intended to
be created by the Security Agreement, and reciting with respect to the security
interests in the Collateral, the details of such action, or (ii) stating that,
in the opinion of such counsel, no such action is necessary to make such Lien
effective.

     (b)  The Company shall furnish to the Collateral Agent and the Trustee on
March 15 in each year beginning with 2001, an Opinion of Counsel, dated as of
such date, either (i) (A) stating that, in the opinion of such counsel, action
has been taken with respect to the recording, registering, filing, re-recording,
re-registering and refiling of all supplemental indentures, financing
statements, continuation statements or other instruments of further assurance as
is necessary to maintain the Lien of the Security  Agreement and reciting with
respect to the security interests in the Collateral the details of such action
or referring to prior Opinions of Counsel in which such details are given, (B)
stating that, based on relevant laws as in effect on the date of such Opinion of
Counsel, all financing statements and continuation statements have been executed
and filed that are necessary as of such date and during the succeeding 12

                                       68
<PAGE>

months fully to preserve and protect, to the extent such protection and
preservation are possible by filing, the rights of the Holders of Notes and the
Collateral Agent and the Trustee hereunder and under the Security Agreement with
respect to the security interests in the Collateral, or (ii) stating that, in
the opinion of such counsel, no such action is necessary to maintain such Lien
and assignment.

     (c)  The Company shall otherwise comply with the provisions of TIA
(S)314(b).

Section 10.03.  Release of Collateral.

     (a)  Collateral may be released only in accordance with the terms of the
Security Agreement.

     (b)  At any time when a Default or Event of Default shall have occurred and
be continuing and the maturity of the Notes shall have been accelerated (whether
by declaration or otherwise) and the Trustee shall have delivered a notice of
acceleration to the Collateral Agent, no release of Collateral pursuant to the
provisions of the Security Agreement shall be effective as against the Holders
of Notes.

     (c)  The release of any Collateral from the terms of this Indenture and the
Security Agreement shall not be deemed to impair the security under this
Indenture in contravention of the provisions hereof if and to the extent the
Collateral is released pursuant to the terms of the Security Agreement.  To the
extent applicable, the Company shall cause TIA (S) 313(b), relating to reports,
and TIA (S) 314(d), relating to the release of property or securities from the
Lien and security interest of the Security Agreement and relating to the
substitution therefor of any property or securities to be subjected to the Lien
and security interest of the Security Agreement, to be complied with.  Any
certificate or opinion required by TIA (S) 314(d) may be made by an Officer of
the Company except in cases where TIA (S) 314(d) requires that such certificate
or opinion be made by an independent Person, which Person shall be an
independent engineer, appraiser or other expert selected or approved by the
Trustee and the Security Agent in the exercise of reasonable care.

Section 10.04.  Certificates of the Company.

     The Company shall furnish to the Trustee and the Collateral Agent, prior to
each proposed release of Collateral pursuant to the Security Agreement, (i) all
documents required by TIA (S)314(d) and (ii) an Opinion of Counsel, which may be
rendered by internal counsel to the Company, to the effect that such
accompanying documents constitute all documents required by TIA (S)314(d).  The
Trustee may, to the extent permitted by Sections 7.01 and 7.02 hereof, accept as
conclusive evidence of compliance with the foregoing provisions the appropriate
statements contained in such documents and such Opinion of Counsel.

Section 10.05.  Certificates of the Trustee.

     In the event that the Company wishes to release Collateral in accordance
with the Security Agreement and has delivered the certificates and documents
required by the Security Agreement and Sections 10.03 and 10.04 hereof, the
Trustee shall determine whether it has received all documentation required by
TIA (S) 314(d) in connection with such release and, based on such determination
and the Opinion of Counsel delivered pursuant to Section 10.04(b), shall deliver
a certificate to the Collateral Agent setting forth such determination.

Section 10.06.  Authorization of Actions to Be Taken by the Trustee Under the
Security Agreement.

     Subject to the provisions of Section 7.01 and 7.02 hereof, the Trustee may,
in its sole discretion and without the consent of the Holders of Notes, direct,
on behalf of the Holders of Notes, the Collateral

                                       69
<PAGE>

Agent to, take all actions it deems necessary or appropriate in order to (a)
enforce any of the terms of the Security Agreement and (b) collect and receive
any and all amounts payable in respect of the Obligations of the Company
hereunder. The Trustee shall have power to institute and maintain such suits and
proceedings as it may deem expedient to prevent any impairment of the Collateral
by any acts that may be unlawful or in violation of the Security Agreement or
this Indenture, and such suits and proceedings as the Trustee may deem expedient
to preserve or protect its interests and the interests of the Holders of Notes
in the Collateral (including power to institute and maintain suits or
proceedings to restrain the enforcement of or compliance with any legislative or
other governmental enactment, rule or order that may be unconstitutional or
otherwise invalid if the enforcement of, or compliance with, such enactment,
rule or order would impair the security interest hereunder or be prejudicial to
the interests of the Holders of Notes or of the Trustee).

Section 10.07.  Authorization of Receipt of Funds by the Trustee Under the
Pledge Agreement.

     The Trustee is authorized to receive any funds for the benefit of the
Holders of Notes distributed under the Security Agreement, and to make further
distributions of such funds to the Holders of Notes according to the provisions
of this Indenture.

Section 10.08.  Termination of Security Interest.

     Upon the payment in full of all Obligations of the Company under this
Indenture and the Notes, or upon Legal Defeasance, the Trustee shall, at the
request of the Company, deliver a certificate to the Collateral Agent stating
that such Obligations have been paid in full, and instruct the Collateral Agent
to release the Liens pursuant to this Indenture and the Security Agreement.

                                  ARTICLE 11.
                               PLEDGE AGREEMENT

Section 11.01.  Pledge Agreement.

     The due and punctual payment of the principal of and interest and
Liquidated Damages, if any, on the Notes when and as the same shall be due and
payable, whether on an interest payment date, at maturity, by acceleration,
repurchase, redemption or otherwise, and interest on the overdue principal of
and interest and Liquidated Damages (to the extent permitted by law), if any, on
the Notes and performance of all other obligations of the Company to the Holders
of Notes or the Trustee under this Indenture and the Notes, according to the
terms hereunder or thereunder, shall be secured as provided in the Pledge
Agreement which the Company has entered into simultaneously with the execution
of this Indenture and which is attached as Exhibit F hereto.  Each Holder of
Notes, by its acceptance thereof, consents and agrees to the terms of the Pledge
Agreement (including, without limitation, the provisions providing for
foreclosure and release of the Pledge Account) as the same may be in effect or
may be amended from time to time in accordance with its terms and authorizes and
directs the Collateral Agent to enter into the Pledge Agreement and to perform
its obligations and exercise its rights thereunder in accordance therewith.  The
Company shall deliver to the Trustee copies of all documents delivered by the
Company to the Collateral Securities Intermediary pursuant to the Pledge
Agreement, and shall do or cause to be done all such acts and things as may be
necessary or proper, or as may be required by the provisions of the Pledge
Agreement, to assure and confirm to the Trustee and the Collateral Securities
Intermediary the security interest in the Pledge Account contemplated hereby, by
the Pledge Agreement or any part thereof, as from time to time constituted, so
as to render the same available for the security and benefit of this Indenture
and of the Notes secured hereby, according to the intent and purposes herein

                                       70
<PAGE>

expressed.  The Company shall take, or shall cause its Subsidiaries to take,
upon request of the Trustee, any and all actions reasonably required to cause
the Pledge Agreement to create and maintain, as security for the Obligations of
the Company hereunder, a valid and enforceable perfected first priority Lien in
and on the Pledge Account, in favor of the Collateral Securities Intermediary
for the benefit of the Holders of Notes, superior to and prior to the rights of
all third Persons and subject to no other Liens than Permitted Liens.

Section 11.02.  Recording and Opinions.

     (a)  The Company shall furnish to the Trustee simultaneously with the
execution and delivery of this Indenture an Opinion of Counsel either (i)
stating that in the opinion of such counsel all action has been taken with
respect to the recording, registering and filing of this Indenture, financing
statements or other instruments necessary to make effective the Lien intended to
be created by the Pledge Agreement, and reciting with respect to the security
interests in the Pledge Account, the details of such action, or (ii) stating
that, in the opinion of such counsel, no such action is necessary to make such
Lien effective.

     (b)  The Company shall furnish to the Collateral Securities Intermediary
and the Trustee on March 15 in each year beginning with 2001, an Opinion of
Counsel, dated as of such date, either (i) (A) stating that, in the opinion of
such counsel, action has been taken with respect to the recording, registering,
filing, re-recording, re-registering and refiling of all supplemental
indentures, financing statements, continuation statements or other instruments
of further assurance as is necessary to maintain the Lien of the Pledge
Agreement and reciting with respect to the security interests in the Pledge
Account the details of such action or referring to prior Opinions of Counsel in
which such details are given, (B) stating that, based on relevant laws as in
effect on the date of such Opinion of Counsel, all financing statements and
continuation statements have been executed and filed that are necessary as of
such date and during the succeeding 12 months fully to preserve and protect, to
the extent such protection and preservation are possible by filing, the rights
of the Holders of Notes and the Collateral Securities Intermediary and the
Trustee hereunder and under the Pledge Agreement with respect to the security
interests in the Pledge Account, or (ii) stating that, in the opinion of such
counsel, no such action is necessary to maintain such Lien and assignment.

     (c)  The Company shall otherwise comply with the provisions of TIA
(S)314(b).

Section 11.03.  Release of Cash Collateral and the Pledge Account.

     (a)  Cash Collateral and the Pledge Account may be released, in whole or in
part, only in accordance with the terms of the Pledge Agreement.

     (b)  At any time when a Default or Event of Default shall have occurred and
be continuing and the maturity of the Notes shall have been accelerated (whether
by declaration or otherwise) and the Trustee shall have delivered a notice of
acceleration to the Collateral Securities Intermediary, no release of Cash
Collateral or the Pledge Account pursuant to the provisions of the Pledge
Agreement shall be effective as against the Holders of Notes.

     (c)  The release of any Cash Collateral or the Pledge Account from the
terms of this Indenture and the Pledge Agreement shall not be deemed to impair
the security under this Indenture in contravention of the provisions hereof if
and to the extent Cash Collateral and the Pledge Account is released pursuant to
the terms of the Pledge Agreement. To the extent applicable, the Company shall
cause TIA (S) 313(b), relating to reports, and TIA (S) 314(d), relating to the
release of property or securities from the Lien and security interest of the
Pledge Agreement and relating to the substitution therefor of any property or
securities to be subjected to the Lien and security interest of the Pledge
Agreement, to be

                                       71
<PAGE>

complied with. Any certificate or opinion required by TIA (S) 314(d) may be made
by an Officer of the Company except in cases where TIA (S) 314(d) requires that
such certificate or opinion be made by an independent Person, which Person shall
be an independent engineer, appraiser or other expert selected or approved by
the Trustee and the Collateral Securities Intermediary in the exercise of
reasonable care.

Section 11.04.  Certificates of the Company.

     The Company shall furnish to the Trustee and the Collateral Securities
Intermediary, prior to each proposed release of Collateral pursuant to the
Pledge Agreement, (i) all documents required by TIA (S)314(d) and (ii) an
Opinion of Counsel, which may be rendered by internal counsel to the Company, to
the effect that such accompanying documents constitute all documents required by
TIA (S)314(d).  The Trustee may, to the extent permitted by Sections 7.01 and
7.02 hereof, accept as conclusive evidence of compliance with the foregoing
provisions the appropriate statements contained in such documents and such
Opinion of Counsel.

Section 11.05.  Certificates of the Trustee.

     In the event that the Company wishes to release Cash Collateral or the
Pledge Account in accordance with the Pledge Agreement and has delivered the
certificates and documents required by the Pledge Agreement and Sections 11.03
and 11.04 hereof, the Trustee shall determine whether it has received all
documentation required by TIA (S) 314(d) in connection with such release and,
based on such determination and the Opinion of Counsel delivered pursuant to
Section 10.04(b), shall deliver a certificate to the Collateral Securities
Intermediary setting forth such determination.

Section 11.06.  Authorization of Actions to Be Taken by the Trustee Under the
Pledge Agreement.

     Subject to the provisions of Section 7.01 and 7.02 hereof, the Trustee may,
in its sole discretion and without the consent of the Holders of Notes, direct,
on behalf of the Holders of Notes, the Collateral Securities Intermediary to,
take all actions it deems necessary or appropriate in order to (a) enforce any
of the terms of the Pledge Agreement and (b) collect and receive any and all
amounts payable in respect of the Obligations of the Company hereunder.  The
Trustee shall have power to institute and maintain such suits and proceedings as
it may deem expedient to prevent any impairment of the Cash Collateral and the
Pledge Account by any acts that may be unlawful or in violation of the Pledge
Agreement or this Indenture, and such suits and proceedings as the Trustee may
deem expedient to preserve or protect its interests and the interests of the
Holders of Notes in the Cash Collateral and the Pledge Account (including power
to institute and maintain suits or proceedings to restrain the enforcement of or
compliance with any legislative or other governmental enactment, rule or order
that may be unconstitutional or otherwise invalid if the enforcement of, or
compliance with, such enactment, rule or order would impair the security
interest hereunder or be prejudicial to the interests of the Holders of Notes or
of the Trustee).

Section 11.07.  Authorization of Receipt of Funds by the Trustee Under the
Pledge Agreement.

     The Trustee is authorized to receive any funds for the benefit of the
Holders of Notes distributed under the Pledge Agreement, and to make further
distributions of such funds to the Holders of Notes according to the provisions
of this Indenture.

Section 11.08.  Termination of Security Interest.

     Upon the payment in full of the first six scheduled interest payments on
the Notes (and all Obligations of the Company under this Indenture and the
Notes, or upon Legal Defeasance, the Trustee

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shall, at the request of the Company, deliver a certificate to the Collateral
Securities Intermediary stating that such Obligations have been paid in full,
and instruct the Collateral Securities Intermediary to release the Liens
pursuant to this Indenture and the Pledge Agreement.

                                  ARTICLE 12.
                          SATISFACTION AND DISCHARGE

Section 12.01.  Satisfaction and Discharge.

     This Indenture will be discharged and will cease to be of further effect as
to all Notes issued hereunder, when:

(1)  either:

     (a)  all Notes that have been authenticated (except lost, stolen or
          destroyed Notes that have been replaced or paid and Notes for whose
          payment money has theretofore been deposited in trust and thereafter
          repaid to the Company) have been delivered to the Trustee for
          cancellation; or

     (b)  all Notes that have not been delivered to the Trustee for cancellation
          have become due and payable by reason of the making of a notice of
          redemption or otherwise or will become due and payable within one year
          and the Company has irrevocably deposited or caused to be deposited
          with the Trustee as trust funds in trust solely for the benefit of the
          Holders, cash in U.S. dollars, non-callable Government Securities, or
          a combination thereof, in such amounts as will be sufficient without
          consideration of any reinvestment of interest, to pay and discharge
          the entire indebtedness on the Notes not delivered to the Trustee for
          cancellation for principal, premium, Liquidated Damages, if any, and
          accrued interest to the date of maturity or redemption;

(2)  no Default or Event of Default shall have occurred and be continuing on the
     date of such deposit or shall occur as a result of such deposit (other than
     a Default or Event of Default resulting from the incurrence of Indebtedness
     all or a portion of the proceeds of which will be used to defease the Notes
     pursuant to Article Eight concurrently with such incurrence) and such
     deposit will not result in a breach or violation of, or constitute a
     default under, any other instrument to which the Company is a party or by
     which the Company is bound;

(3)  the Company has paid or caused to be paid all sums payable by it under this
     Indenture; and

(4)  the Company has delivered irrevocable instructions to the Trustee under
     this Indenture to apply the deposited money toward the payment of the Notes
     at maturity or the redemption date, as the case may be.

In addition, the Company must deliver an Officers' Certificate and an Opinion of
Counsel to the Trustee stating that all conditions precedent to satisfaction and
discharge have been satisfied.

     Notwithstanding the satisfaction and discharge of this Indenture, if money
shall have been deposited with the Trustee pursuant to subclause (b) of clause
(1) of this Section, the provisions of Section 11.02 and Section 8.06 shall
survive.

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Section 12.02.  Application of Trust Money.

     Subject to the provisions of Section 8.06, all money deposited with the
Trustee pursuant to Section 11.01 shall be held in trust and applied by it, in
accordance with the provisions of the Notes and this Indenture, to the payment,
either directly or through any Paying Agent (including the Company acting as its
own Paying Agent) as the Trustee may determine, to the Persons entitled thereto,
of the principal (and premium, if any) and interest for whose payment such money
has been deposited with the Trustee; but such money need not be segregated from
other funds except to the extent required by law.

     If the Trustee or Paying Agent is unable to apply any money or Government
Securities in accordance with Section 11.01 by reason of any legal proceeding or
by reason of any order or judgment of any court or governmental authority
enjoining, restraining or otherwise prohibiting such application, the Company's
obligations under this Indenture and the Notes shall be revived and reinstated
as though no deposit had occurred pursuant to Section 11.01; provided that if
the Company has made any payment of principal of, premium, if any, or interest
on any Notes because of the reinstatement of its obligations, the Company shall
be subrogated to the rights of the Holders of such Notes to receive such payment
from the money or Government Securities held by the Trustee or Paying Agent.

                                  ARTICLE 13.
                                 MISCELLANEOUS

Section 13.01.  Trust Indenture Act Controls.

     If any provision of this Indenture limits, qualifies or conflicts with the
duties imposed by TIA (S)318(c), the duties imposed by TIA (S)318(c) shall
control.

Section 13.02.  Notices.

     Any notice or communication by the Company or the Trustee to the others is
duly given if in writing and delivered in Person or mailed by first class mail
(registered or certified, return receipt requested), telex, telecopier or
overnight air courier guaranteeing next day delivery, to the others' address:

     If to the Company:

     XM Satellite Radio Inc.
     1250 23/rd/ Street, N.W., Suite 57
     Washington, D.C. 20037-1100
     Telecopier No.:  (202) 969-7124
     Attention:  Joseph Titlebaum / General Counsel

     With a copy to:

     Hogan & Hartson
     555 Thirteenth Street, N.W.
     Washington D.C. 20004
     Telecopier No.: (202) 637-5600
     Attention:  Steven M. Kaufman, Esq.

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<PAGE>

     If to the Trustee:

     United States Trust Company of New York
     114 W. 47th Street
     New York, NY 10036
     Telecopier No.:  (212) 852-1626
     Attention:  Corporate Trust Division

     The Company or the Trustee, by notice to the others may designate
additional or different addresses for subsequent notices or communications.

     All notices and communications (other than those sent to Holders) shall be
deemed to have been duly given: at the time delivered by hand, if personally
delivered; five Business Days after being deposited in the mail, postage
prepaid, if mailed; when answered back, if telexed; when receipt acknowledged,
if telecopied; and the next Business Day after timely delivery to the courier,
if sent by overnight air courier guaranteeing next day delivery.

     Any notice or communication to a Holder shall be mailed by first class
mail, certified or registered, return receipt requested, or by overnight air
courier guaranteeing next day delivery to its address shown on the register kept
by the Registrar.  Any notice or communication shall also be so mailed to any
Person described in TIA (S) 313(c), to the extent required by the TIA.  Failure
to mail a notice or communication to a Holder or any defect in it shall not
affect its sufficiency with respect to other Holders.

     If a notice or communication is mailed in the manner provided above within
the time prescribed, it is duly given, whether or not the addressee receives it.

     If the Company mails a notice or communication to Holders, it shall mail a
copy to the Trustee and each Agent at the same time.

Section 13.03.  Communication by Holders of Notes with Other Holders of Notes.

     Holders may communicate pursuant to TIA (S) 312(b) with other Holders with
respect to their rights under this Indenture or the Notes.  The Company, the
Trustee, the Registrar and anyone else shall have the protection of TIA (S)
312(c).

Section 13.04.  Certificate and Opinion as to Conditions Precedent.

     Upon any request or application by the Company to the Trustee to take any
action under this Indenture, the Company shall furnish to the Trustee:

     (a)  an Officers' Certificate in form and substance reasonably satisfactory
to the Trustee (which shall include the statements set forth in Section 13.05
hereof) stating that, in the opinion of the signers, all conditions precedent
and covenants, if any, provided for in this Indenture relating to the proposed
action have been satisfied; and

     (b)  an Opinion of Counsel in form and substance reasonably satisfactory to
the Trustee (which shall include the statements set forth in Section 13.05
hereof) stating that, in the opinion of such counsel, all such conditions
precedent and covenants have been satisfied.

                                       75
<PAGE>

Section 13.05.  Statements Required in Certificate or Opinion.

     Each certificate or opinion with respect to compliance with a condition or
covenant provided for in this Indenture (other than a certificate provided
pursuant to TIA (S) 314(a)(4)) shall comply with the provisions of TIA (S)
314(e) and shall include:

     (c)  a statement that the Person making such certificate or opinion has
read such covenant or condition;

     (d)  a brief statement as to the nature and scope of the examination or
investigation upon which the statements or opinions contained in such
certificate or opinion are based;

     (e)  a statement that, in the opinion of such Person, he or she has made
such examination or investigation as is necessary to enable him to express an
informed opinion as to whether or not such covenant or condition has been
satisfied; and

     (f)  a statement as to whether or not, in the opinion of such Person, such
condition or covenant has been satisfied.

Section 13.06.  Rules by Trustee and Agents.

     The Trustee may make reasonable rules for action by or at a meeting of
Holders.  The Registrar or Paying Agent may make reasonable rules and set
reasonable requirements for its functions.

Section 13.07.  No Personal Liability of Directors, Officers, Employees and
Stockholders.

     No past, present or future director, officer, employee, agent,
incorporator, member, manager, partner or stockholder of the Company, as such,
shall have any liability for any obligations of the Company under the Notes,
this Indenture, the Pledge Agreement or the Security Agreement or for any claim
based on, in respect of, or by reason of, such obligations or their creation.
Each Holder by accepting a Note waives and releases all such liability.  The
waiver and release are part of the consideration for issuance of the Notes.

Section 13.08.  Governing Law.

     THIS INDENTURE AND THE SECURITIES SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK, AS APPLIED TO CONTRACTS MADE
AND PERFORMED WITHIN THE STATE OF NEW YORK.  THE COMPANY HEREBY IRREVOCABLY
SUBMITS TO THE JURISDICTION OF ANY NEW YORK STATE COURT SITTING IN THE BOROUGH
OF MANHATTAN IN THE CITY OF NEW YORK OR ANY FEDERAL COURT SITTING IN THE BOROUGH
OF MANHATTAN IN THE CITY OF NEW YORK IN RESPECT OF ANY SUIT, ACTION OR
PROCEEDING ARISING OUT OF OR RELATING TO THIS INDENTURE AND THE SECURITIES, AND
IRREVOCABLY ACCEPTS FOR ITSELF AND IN RESPECT OF ITS PROPERTY, GENERALLY AND
UNCONDITIONALLY, JURISDICTION OF THE AFORESAID COURTS.  THE COMPANY IRREVOCABLY
WAIVES, TO THE FULLEST EXTENT IT MAY EFFECTIVELY DO SO UNDER APPLICABLE LAW,
TRIAL BY JURY AND ANY OBJECTION WHICH IT MAY NOW OR HEREAFTER HAVE TO THE LAYING
OF THE VENUE OF ANY SUCH SUIT, ACTION OR PROCEEDING BROUGHT IN ANY SUCH COURT
AND ANY CLAIM THAT ANY SUCH SUIT, ACTION OR PROCEEDING BROUGHT IN ANY SUCH COURT
HAS BEEN BROUGHT IN AN INCONVENIENT FORUM.  NOTHING HEREIN SHALL AFFECT THE
RIGHT OF TIE TRUSTEE OR ANY SECURITYHOLDER TO

                                       76
<PAGE>

SERVE PROCESS IN ANY OTHER MANNER PERMITTED BY LAW OR TO COMMENCE LEGAL
PROCEEDINGS OR OTHERWISE PROCEED AGAINST THE COMPANY IN ANY OTHER JURISDICTION.

Section 13.09.  No Adverse Interpretation of Other Agreements.

     This Indenture may not be used to interpret any other indenture, loan or
debt agreement of the Company or its Subsidiaries or of any other Person.  Any
such indenture, loan or debt agreement may not be used to interpret this
Indenture.

Section 13.10.  Successors.

     All agreements of the Company in this Indenture and the Notes shall bind
its successors.  All agreements of the Trustee in this Indenture shall bind its
successors

Section 13.11.  Severability.

     In case any provision in this Indenture or in the Notes shall be invalid,
illegal or unenforceable, the validity, legality and enforceability of the
remaining provisions shall not in any way be affected or impaired thereby.

Section 13.12.  Counterpart Originals.

     The parties may sign any number of copies of this Indenture.  Each signed
copy shall be an original, but all of them together represent the same
agreement.

Section 13.13.  Table of Contents, Headings, etc.

     The Table of Contents, Cross-Reference Table and Headings of the Articles
and Sections of this Indenture have been inserted for convenience of reference
only, are not to be considered a part of this Indenture and shall in no way
modify or restrict any of the terms or provisions hereof.

                        [Signatures on following page]

                                       77
<PAGE>

                                  SIGNATURES

Dated as of March 15, 2000
                                        XM Satellite Radio Inc.

                                        By:_______________________________

                                           Name:
                                           Title:

Attest:

__________________________________
Name:
Title:

                                        UNITED STATES Trust Company of New York

                                        By:_______________________________
                                           Name:
                                           Title:

Attest:

__________________________________
Authorized Signatory
Date:

                                       78

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