<PAGE>

                                                                    Exhibit 10.6

                          FIFTH AMENDMENT AND WAIVER
                                      TO
                      AMENDED AND RESTATED LOAN AGREEMENT

     THIS FIFTH AMENDMENT AND WAIVER TO AMENDED AND RESTATED LOAN AGREEMENT,
dated as of the 26th day of March, 2001 (this "Amendment"), is made by and among
                                               ---------
AMERICAN TOWER, L.P., a Delaware limited partnership, AMERICAN TOWERS, INC., a
Delaware corporation, VERESTAR, INC. (f/k/a ATC TELEPORTS, INC.), a Delaware
corporation (collectively, the "Borrowers"), THE FINANCIAL INSTITUTIONS
                                ---------
SIGNATORIES HERETO and TORONTO DOMINION (TEXAS), INC., as administrative agent
(in such capacity, the "Administrative Agent").
                        --------------------

                             W I T N E S S E T H:
                             - - - - - - - - - -

     WHEREAS, the Borrowers, the Lenders (as defined therein), the Issuing Bank
(as defined therein) and the Administrative Agent are all parties to that
certain Amended and Restated Loan Agreement dated as of January 6, 2000 (as
previously amended and as hereafter amended, modified, restated and supplemented
from time to time, the "Loan Agreement"); and
                        --------------

     WHEREAS, the Borrowers have requested amendments to certain provisions of
the Loan Agreement, and, subject to the terms and conditions set forth herein,
the Lenders and the Administrative Agent are willing to amend certain provisions
of the Loan Agreement as more specifically set forth herein;

     NOW, THEREFORE, in consideration of the premises set forth above, and other
good and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto hereby agree that all capitalized terms used
and not defined herein shall have the meanings ascribed to such terms in the
Loan Agreement, and further hereby agree as follows:

     1.   Amendments. The Loan Agreement is hereby amended as more fully set for
          ----------
the below:

          (a)    Amendments to Article 1.
                 -----------------------

                 (i)     Section 1.1 of the Loan Agreement, Definitions, is
                                                            -----------
     hereby amended by deleting the definitions of "Available Revolving Loan
                                                    ------------------------
     Commitment" and "Borrowers" in their entirety and by substituting the
     ----------       ---------
     following definitions in lieu thereof:

          "'Available Revolving Loan Commitment'" shall mean, as of any date,
            -----------------------------------
     (a) for all times prior to the Borrowing Base Termination Date, the lesser
     of (i)(A) the Revolving Loan Commitments in effect on such date minus (B)
                                                                     -----
     the sum of (1) the Revolving Loans then outstanding plus (2) the Letter of
                                                         ----
     Credit Obligations then outstanding, and (ii)(A) the Borrowing Base on such
                                          ---
     date minus (B) the sum of (1) all Loans then outstanding plus (2) the
          -----                                               ----
     Letter of Credit Obligations then outstanding plus (3) any Capitalized
                                                   ----
     Lease Obligations then outstanding, and, (b) for all other times, the
     difference between (i) the
<PAGE>

     Revolving Loan Commitments in effect on such date minus (ii) the sum of (A)
                                                       -----
     the Revolving Loans then outstanding plus (B) the Letter of Credit
                                          ----
     Obligations then outstanding."

          "'Borrowers' shall mean, collectively, AT L.P., AT Inc., Verestar,
            ---------
     Inc. (f/k/a ATC Teleports), and Towersites Monitoring, Inc., a Delaware
     corporation, and shall include Kline Steel and such other Persons as may be
     approved by the Majority Lenders at such time as any such Person executes
     and delivers to the Administrative Agent an assignment and assumption
     agreement in form and substance satisfactory to the Administrative Agent
     and each other Loan Document as executed by the other Borrowers; and
     "Borrower" shall mean any one of the foregoing."
      --------

                 (ii)    Section 1.1 of the Loan Agreement, Definitions, is
                                                            -----------
     hereby further amended by deleting the reference to Section 7.6(d) in the
     definition of "Loan Purchase Agreement" and replacing it with Section
                    -----------------------
     7.6(b).


                 (iii)   Section 1.1 of the Loan Agreement, Definitions, is
                                                            -----------
hereby further amended by inserting the following new definitions of "ATC
                                                                      ---
International", "ATC Mexico", and "Net Investment Amount" in the proper
-------------    ----------        ---------------------
alphabetical order:


          "'ATC International' shall mean ATC International Holdings Corp., a
            -----------------
     Delaware corporation, and any entity that is a successor thereto."

          "'ATC Mexico' shall mean American Tower Corporation de Mexico, S. de
            ----------
     R.L. de C.V., a Mexico limited liability company, and any entity that is a
     successor thereto."

          "'Net Investment Amount' shall mean an amount equal to the excess of
            ---------------------
     (a) the aggregate amount (valued, for these purposes, at their original
     cost) of all such Investments (which, for these purposes shall not include
     the distribution by AT Inc. of its Investment in ATC Mexico to ATC
     International) made pursuant to the provisions of Section 7.6(b) hereof
     from and after March 31, 2001, over (b) the sum of (i) the net cash
     proceeds received upon sale, transfer or other disposition of any such
     Investments, or any Investments derived therefrom (after deducting costs
     and expenses of sale, transfer or other disposition), and (ii) the
     aggregate amount of such Investments made pursuant to Section 7.6(b)(iii)
     hereof in Persons whose acquisition, merger or lease/sublease agreement
     with the Parent, any Borrower or any of the Restricted Subsidiaries shall
     have been consummated (so long as the assets acquired or leased are owned
     or leased by any Borrower or any of the Restricted Subsidiaries)."

          (b)    Amendment to Article 2. Section 2.7(b)(vi) of the Loan
                 ----------------------
     Agreement Loans in excess of Borrowing Base, is hereby amended by deleting
               ---------------------------------
     such section in its entirety and substituting in lieu thereof the following
     section:

                 "(vi)   Loans in Excess of Borrowing Base. If, on any date
                         ---------------------------------
     prior to the Borrowing Base Termination Date, the Loans then outstanding
     exceed the difference of

                                     - 2 -
<PAGE>

     (A) the Borrowing Base minus (B) any Capitalized Lease Obligations then
                            -----
     outstanding on such date, the Loans shall be repaid in an amount equal to,
     in the aggregate, such excess. The Borrowers may, at their option, apply
     such reduction to the Revolving Loans, the Term Loan A Loans or Term Loan B
     Loans."

          (c)    Amendment to Article 7.
                 ----------------------

          (i)    Section 7.1 of the Loan Agreement, Indebtedness of the
                                                    -------------------
     Borrowers and the Restricted Subsidiaries, is hereby amended by deleting
     -----------------------------------------
     subsection (g) thereof in its entirety and substituting in lieu thereof the
     following:

                 "(g)  Capitalized Lease Obligations;"

          (ii)   Section 7.6 of the Loan Agreement, Investments and
                                                    ---------------
     Acquisitions, is hereby amended by deleting subsection (b) thereof in its
     ------------
     entirety and substituting in lieu thereof the following:

                 "(b)    so long as no Default then exists or would be caused
          thereby, establish Unrestricted Subsidiaries and make Investments in
          (i) such Unrestricted Subsidiaries (in addition to Investments
          permitted under Section 7.6(e), (f) and (g) hereof), (ii) ATC
          International and (iii) Persons primarily engaged in domestic and
          foreign communications tower and tower related businesses in an
          aggregate amount, directly or indirectly (including notwithstanding
          anything in this Loan Agreement to the contrary, distributions to the
          Parent that are contemporaneously contributed as equity or loaned (if
          such loan is evidenced by a note) to ATC International, which
          distributions shall not be deemed Restricted Payments for the purposes
          of this Agreement), provided that, giving effect to such additional
          Investment, the aggregate Net Investment Amount made pursuant to the
          provisions of this Section 7.6(b) from and after March 31, 2001 shall
          not exceed (x) $350,000,000.00 if at the time of such Investment the
          Leverage Ratio is greater than or equal to 6.00 to 1.00 and (y)
          $500,000,000.00 at all other times; provided that, in the case of
                                              --------
          Investments made pursuant to clause (ii) of this Section 7.6(b), the
          Parent grants to the Lenders a first priority security interest in the
          Parent's ownership thereof and any notes executed in connection
          therewith and ATC International executes a Guaranty in favor of the
          Lenders; and provided further that, in the case of Investments made
                       -------- -------
          pursuant to clause (iii) of this Section 7.6(b), the Parent, any
          Borrower or any of the Restricted Subsidiaries has executed a binding
          acquisition, merger, lease/sublease or management agreement with such
          Person;"

          (iii)  Section 7.6 of the Loan Agreement, Investments and
                                                    ---------------
     Acquisitions, is hereby further amended by deleting subsection (d) thereof
     -------------
     in its entirety and substituting in lieu thereof the following:

                 "(d)  [Reserved]"

                                     - 3 -
<PAGE>

     2.   Amendment to Schedule 2, Acknowledgment and Consent. The Borrowers
          ---------------------------------------------------
sent a notice (the "Notice") to the Lenders on February 23, 2001 designating
                    ------
American Tower Corporation de Mexico, S. de R.L. de C.V. ("ATC Mexico") as an
                                                           ----------
Unrestricted Subsidiary. To clarify the status of the Borrower's Subsidiaries,
Schedule 2 to the Loan Agreement, Restricted Subsidiaries and Unrestricted
----------
Subsidiaries, is hereby amended by deleting such schedule in its entirety and
substituting in lieu thereof Schedule 2 attached hereto. The Lenders also
                             ----------
consent to (a) the transfer of the equity interest in ATC Mexico to ATC
International Holdings Corp. ("ATC International"), a Delaware corporation,
                               -----------------
which transfer may be done by a distribution to the Parent that is then
contemporaneously transferred to ATC International (such distribution shall not
be deemed a Restricted Payment for purposes under the Agreement) and (b) that
prior to the transfer to ATC International, the equity of ATC Mexico held by AT
Inc. will not be pledged to the Lenders; provided, that if such transfer does
                                         --------
not occur within 180 days from the date hereof, the Borrowers shall grant to the
Lenders a first priority security interest on the equity on ATC Mexico (which
may be accomplished directly or indirectly through a domestic unrestricted
subsidiary holding company).

     3.   Waiver. The Borrowers have informed the Administrative Agent that they
          ------
were not in compliance with Section 7.1(g), Indebtedness of the Borrower and the
                                            ------------------------------------
Restricted Subsidiaries, as it related to Capitalized Lease Obligations as of
-----------------------
December 31, 2000. The Lenders hereby waive any Default or Event of Default that
may have occurred under Section 7.1(g) solely with respect to the Borrowers'
incurring Capitalized Lease Obligations in excess of $100,000,000 as of December
31, 2000 and through the date of this Amendment.

     4.   No Other Amendment or Waiver. Except for the amendments and waiver set
          ----------------------------
forth above, the text of the Loan Agreement and all other Loan Documents shall
remain unchanged and in full force and effect. No amendment or waiver by the
Administrative Agent, the Issuing Bank or the Lenders under the Loan Agreement
or any other Loan Document is granted or intended except as expressly set forth
herein, and the Administrative Agent, the Issuing Bank and the Lenders expressly
reserve the right to require strict compliance in all other respects (whether or
not in connection with any Requests for Advance). Except as set forth herein,
the amendments and waiver agreed to herein shall not constitute a modification
of the Loan Agreement or any of the other Loan Documents, or a course of dealing
with the Administrative Agent, the Issuing Bank and the Lenders at variance with
the Loan Agreement or any of the other Loan Documents, such as to require
further notice by the Administrative Agent, the Issuing Bank, the Lenders or the
Majority Lenders to require strict compliance with the terms of the Loan
Agreement and the other Loan Documents in the future.

     5.   Conditions Precedent. The effectiveness of this Amendment is subject
          --------------------
to the following:

     (a)  Receipt by the Administrative Agent of:

          (i)    duly executed signature pages to this Amendment from the
          Majority Lenders;

                                     - 4 -
<PAGE>

          (ii)   a duly executed Guaranty from ATC International Holdings Corp.

          (iii)  a duly executed Guaranty from Towersites Monitoring, Inc.

          (iv)   a duly executed Security Agreement from Towersites Monitoring,
          Inc.

          (v)    a duly executed Assumption Agreement, in form and substance
          acceptable to the Administrative Agent, from Towersites Monitoring,
          Inc.

          (vi)   a legal opinion from Sullivan & Worcester LLP, counsel to the
          Borrowers, its Subsidiaries and ATC International Holdings Corp. in
          form and substance addressed to the Administrative Agent and the
          Lenders and dated the date hereof;

          (vii)  a loan certificate of Towersites Monitoring, Inc., in
          substantially in the form of Exhibit V attached to the Loan Agreement,
          with all exhibits thereto; and

          (viii) UCC-1 financing statements signed by Towersites Monitoring,
          Inc. to be filed in the appropriate filing offices.

     (b)  The representations and warranties contained in Article 4 of the Loan
Agreement and contained in the other Loan Documents remain true and correct as
of the date hereof, both before and after giving effect to this Agreement,
except to the extent previously fulfilled in accordance with the terms of the
Loan Agreement or such other Loan Document, as applicable, or to the extent
relating specifically to the earlier date. No Default or Event of Default now
exists or will be caused hereby.

     6.   Counterparts. This Amendment may be executed in any number of
          ------------
counterparts, each of which shall be deemed to be an original, but all such
separate counterparts shall together constitute but one and the same instrument.

     7.   Governing Law. This Amendment shall be construed in accordance with
          -------------
and governed by the laws of the State of New York.

     8.   Severability. Any provision of this Amendment which is prohibited or
          ------------
unenforceable shall be ineffective to the extent of such prohibition or
unenforceability without invalidating the remaining provisions hereof in that
jurisdiction or affecting the validity or enforceability of such provision in
any other jurisdiction.

                 [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

                                     - 5 -
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have executed this Amendment or
caused it to be executed by their duly authorized officers, all as of the day
and year first above written.


BORROWERS:                         AMERICAN TOWER, L.P., a Delaware limited
                                   partnership

                                   By ATC GP INC., its General Partner


                                   By: /s/ Joseph L. Winn
                                      -----------------------------------
                                      Name: Joseph L. Winn
                                      Title: Chief Financial Officer


                                   AMERICAN TOWERS, INC., a Delaware corporation


                                   By: /s/ Joseph L. Winn
                                      -----------------------------------
                                      Name: Joseph L. Winn
                                      Title: Chief Financial Officer


                                   VERESTAR, INC., a Delaware corporation


                                   By: /s/ Joseph L. Winn
                                      -----------------------------------
                                      Name: Joseph L. Winn
                                      Title: Chief Financial Officer


                                   TOWERSITES MONITORING, INC., a Delaware
                                   corporation


                                   By: /s/ Joseph L. Winn
                                      -----------------------------------
                                      Name: Joseph L. Winn
                                      Title: Chief Financial Officer

<PAGE>

ADMINISTRATIVE AGENT
AND LENDERS:                       TORONTO DOMINION (TEXAS), INC., as
                                   Administrative Agent and as a Lender


                                   By:       /s/
                                      ------------------------------------
                                      Name: Jano Mott
                                      Title: Vice President
<PAGE>

                                   THE BANK OF NEW YORK, as a Lender


                                   By:       /s/
                                      ------------------------------------
                                      Name: Geoffrey C. Brooks
                                      Title: Senior Vice President
<PAGE>

                                   THE CHASE MANHATTAN BANK, as a Lender


                                   By:       /s/
                                      ------------------------------------
                                      Name: William E. Rottino
                                      Title: Vice President
<PAGE>

                                   CREDIT SUISSE FIRST BOSTON, as Lender


                                   By:       /s/
                                      ------------------------------------
                                      Name: David L. Sawyer
                                      Title: Vice President


                                   By:       /s/
                                      ------------------------------------
                                      Name: Lalita Advani
                                      Title:  Assistant Vice President
<PAGE>

                                   ALLFIRST BANK, as a Lender


                                   By:       /s/
                                      ------------------------------------
                                      Name: W. Blake Hampson
                                      Title: Vice President
<PAGE>

                                    ALLSTATE LIFE INSURANCE COMPANY, as a Lender


                                    By:_________________________________________
                                       Name:____________________________________
                                       Title:___________________________________


                                    By:_________________________________________
                                       Name:____________________________________
                                       Title:___________________________________


                                    AIMCO CDO SERIES 2000-A, as a Lender


                                    By:_________________________________________
                                       Name:____________________________________
                                       Title:___________________________________


                                    By:_________________________________________
                                       Name:____________________________________
                                       Title:___________________________________
<PAGE>

                             AMARA-2 FINANCE, LTD., as a Lender
                             By: INVESCO Senior Secured Management, Inc., as
                                 Subadvisor


                             By: /s/ Thomas H.B. Ewald
                                ------------------------------------------------
                                Name: Thomas H.B. Ewald
                                Title: Authorized Signatory


                             AVALON CAPITAL LTD., as a Lender
                             By: INVESCO Senior Secured Management, Inc., as
                                 Portfolio Advisor


                             By: /s/ Thomas H.B. Ewald
                                ------------------------------------------------
                                Name: Thomas H.B. Ewald
                                Title: Authorized Signatory


                             AVALON CAPITAL LTD. 2, as a Lender
                             By: INVESCO Senior Secured Management, Inc., as
                                 Portfolio Advisor


                             By: /s/ Thomas H.B. Ewald
                                ------------------------------------------------
                                Name: Thomas H.B. Ewald
                                Title: Authorized Signatory


                             CERES II FINANCE LTD., as a Lender
                             By: INVESCO Senior Secured Management, Inc., as
                                 Sub-Managing Agent (Financial)


                             By: /s/ Thomas H.B. Ewald
                                ------------------------------------------------
                                Name: Thomas H.B. Ewald
                                Title: Authorized Signatory
<PAGE>

                             CHARTER VIEW PORTFOLIO, as a Lender
                             By: INVESCO Senior Secured Management, Inc., as
                                 Investment Advisor


                             By: /s/ Thomas H.B. Ewald
                                ------------------------------------------------
                                Name: Thomas H.B. Ewald
                                Title: Authorized Signatory


                             TRITON CDO IV, LIMITED, as a Lender
                             By: INVESCO Senior Secured Management, Inc., as
                                 Investment Advisor


                             By: /s/ Thomas H.B. Ewald
                                ------------------------------------------------
                                Name: Thomas H.B. Ewald
                                Title: Authorized Signatory
<PAGE>

                             ARCHIMEDES FUNDING, L.L.C., as a Lender
                             By: ING Capital Advisors LLC, as Collateral Manager


                             By:________________________________________________
                                Name:___________________________________________
                                Title:__________________________________________


                             ARCHIMEDES FUNDING II, LTD., as a Lender
                             By: ING Capital Advisors LLC, as Collateral Manager


                             By:________________________________________________
                                Name:___________________________________________
                                Title:__________________________________________


                             ARCHIMEDES FUNDING III, LTD., as a Lender
                             By: ING Capital Advisors LLC, as Collateral Manager


                             By:________________________________________________
                                Name:___________________________________________
                                Title:__________________________________________


                             ARCHIMEDES FUNDING IV (CAYMAN), LTD., as a Lender
                             By: ING Capital Advisors LLC, as Collateral Manager


                             By:________________________________________________
                                Name:___________________________________________
                                Title:__________________________________________


                             SEQUILS-ING I (HBDGM), LTD., as Assignee
                             By: ING Capital Advisors LLC, as Collateral Manager


                             By:________________________________________________
                                Name:___________________________________________
                                Title:__________________________________________
<PAGE>

                         ADDISON CDO, LIMITED, as a Lender
                         By: Pacific Investment Management Company, LLC, as its
                             Investment Advisor


                         By: /s/ Mohan V. Phansalkar
                            ----------------------------------------------------
                            Name: Mohan V. Phansalkar
                            Title: Executive Vice President


                         ATHENA CDO, LIMITED, as a Lender
                         By: Pacific Investment Management Company, LLC, as its
                             Investment Advisor


                         By: /s/ Mohan V. Phansalkar
                            ----------------------------------------------------
                            Name: Mohan V. Phansalkar
                            Title: Executive Vice President


                         BEDFORD CDO, LIMITED, as a Lender
                         By: Pacific Investment Management Company, LLC, as its
                             Investment Advisor


                         By: /s/ Mohan V. Phansalkar
                            ----------------------------------------------------
                            Name: Mohan V. Phansalkar
                            Title: Executive Vice President


                         CAPTIVA III FINANCE LTD., as a Lender
                         As advised by Pacific Investment Management Company,
                         LLC


                         By: /s/ David Dyer
                            ----------------------------------------------------
                            Name: David Dyer
                            Title: Director
<PAGE>

                         CAPTIVA IV FINANCE LTD., as a Lender
                         As advised by Pacific Investment Management Company,
                         LLC


                         By: /s/ David Dyer
                            ----------------------------------------------------
                            Name: David Dyer
                            Title: Director
<PAGE>

                         DELANO COMPANY, as a Lender
                         By: Pacific Investment Management Company, LLC, as its
                             Investment Advisor


                         By: /s/ Mohan V. Phansalkar
                            ----------------------------------------------------
                            Name: Mohan V. Phansalkar
                            Title: Executive Vice President


                         JISSEKIKUN FUNDING, LTD., as a Lender
                         By: Pacific Investment Management Company, LLC, as its
                             Investment Advisor


                         By: /s/ Mohan V. Phansalkar
                            ----------------------------------------------------
                            Name: Mohan V. Phansalkar
                            Title: Executive Vice President


                         ROYALTON COMPANY, as a Lender
                         By: Pacific Investment Management Company, LLC, as its
                             Investment Advisor


                         By: /s/ Mohan V. Phansalkar
                            ----------------------------------------------------
                            Name: Mohan V. Phansalkar
                            Title: Executive Vice President
<PAGE>

                                  BALANCED HIGH YIELD FUND I LTD., as a Lender
                                  By: BHF (USA) Capital Corporation
                                      Acting as Attorney-in-Fact


                                  By:___________________________________________
                                     Name:______________________________________
                                     Title:_____________________________________


                                  By:___________________________________________
                                     Name:______________________________________
                                     Title:_____________________________________


                                  BALANCED HIGH YIELD FUND II, LTD., as a Lender
                                  By: BHF (USA) Capital Corporation
                                      Acting as Attorney-in-Fact


                                  By:___________________________________________
                                     Name:______________________________________
                                     Title:_____________________________________


                                  By:___________________________________________
                                     Name:______________________________________
                                     Title:_____________________________________
<PAGE>

                                  BANK OF AMERICA, N.A., as a Lender


                                  By:___________________________________________
                                     Name:______________________________________
                                     Title:_____________________________________

<PAGE>

                                   BANK OF MONTREAL, as a Lender


                                   By: /s/ Sarah Kim
                                      ------------------------------------------
                                      Name: Sarah Kim
                                      Title: Director

<PAGE>

                                    THE BANK OF NOVA SCOTIA, as a Lender


                                    By: /s/ P.A. Weissenberger
                                       -----------------------------------------
                                       Name: P.A. Weissenberger
                                       Title: Authorized Signatory
<PAGE>

                         BANK OF SCOTLAND, as a Lender


                         By:______________________________________
                            Name:_________________________________
                            Title:________________________________
<PAGE>

                         BANK UNITED, as a Lender


                         By:___________________________________________
                            Name:______________________________________
                            Title:_____________________________________
<PAGE>

                         BANKERS TRUST COMPANY, as a Lender


                         By:____________________________________________
                            Name:_______________________________________
                            Title:______________________________________
<PAGE>

                         BAYERISCHE HYPO- UND VEREINSBANK AG, NEW
                         YORK BRANCH, as a Lender


                         By:____________________________________________
                            Name:_______________________________________
                            Title:______________________________________

                         By:____________________________________________
                            Name:_______________________________________
                            Title:______________________________________
<PAGE>

                         BEAR STEARNS CORPORATE LENDING INC., as a
                         Lender


                         By:          /s/
                            ---------------------------------------------
                            Name: Victor F. Bulzacchelli
                            Title: Managing Director
<PAGE>

                         CARAVELLE INVESTMENT FUND, L.L.C., as a Lender
                         By:Caravelle Advisors L.L.C.


                         By:________________________________________________
                            Name:___________________________________________
                            Title:__________________________________________
<PAGE>

                         CENTURION CDO II, LTD., as a Lender
                         By:American Express Asset Management Group, Inc., as
                         Collateral Manager


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________
<PAGE>

                         CARLYLE HIGH YIELD PARTNER II, LTD., as a
                         Lender


                         By:_________________________________________________
                            Name:____________________________________________
                            Title:___________________________________________

                         CARLYLE HIGH YIELD PARTNER III, LTD., as a
                         Lender


                         By:_________________________________________________
                            Name:____________________________________________
                            Title:___________________________________________
<PAGE>

                         CITIZENS BANK OF MASSACHUSETTS, as successor
                         to US Trust, as a Lender


                         By:          /s/
                            ------------------------------------------------
                            Name:  Daniel G. Eastman
                            Title:  Senior Vice President
<PAGE>

                         COBANK, ACB, as a Lender


                         By:____________________________________________
                            Name:_______________________________________
                            Title:______________________________________
<PAGE>

                         CONTINENTAL CASUALTY COMPANY, as a Lender


                         By:          /s/
                            ------------------------------------------
                            Name: Richard W. Dubberke
                            Title: Vice President
<PAGE>

                         COOPERATIEVE CENTRALE RAIFFEISEN-BOERENLEENBANK B.A.,
                         "RABOBANK NEDERLAND", NEW YORK BRANCH, as a Lender


                         By:          /s/
                            ------------------------------------------------
                            Name:  Douglas W. Zylstra
                            Title: Senior Vice President


                         By:          /s/
                            -------------------------------------------------
                            Name:  James S> Cunningham
                            Title: Managing Director, Chief Risk Officer
<PAGE>

                         THE CIT GROUP/EQUIPMENT FINANCING, INC., as a Lender


                         By:_________________________________________________
                            Name:____________________________________________
                            Title:___________________________________________
<PAGE>

                         DEXIA PUBLIC FINANCE BANK-NEW YORK AGENCY (f/k/a CREDIT
                         LOCAL DE FRANCE - NEW YORK AGENCY), as a Lender


                         By:__________________________________________________
                            Name:_____________________________________________
                            Title:____________________________________________


                         By:__________________________________________________
                            Name:_____________________________________________
                            Title:____________________________________________
<PAGE>

                         CREDIT LYONNAIS NEW YORK BRANCH, as a Lender


                         By:            /s/
                            -----------------------------------------
                            Name:  Patrick McCarthy
                            Title: Authorized Signatory
<PAGE>

                         CYPRESSTREE INVESTMENT MANAGEMENT COMPANY, INC., as a
                         Lender
                         As: Attorney-in-Fact and on behalf of First Allmerica
                         Financial Life Insurance Company as Portfolio Manager


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________


                         CYPRESSTREE INVESTMENT PARTNERS I, LTD., as a Lender
                         By: CypressTree Investment Management Company, Inc.,
                         as Portfolio Manager


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________


                         CYPRESSTREE INVESTMENT PARTNERS II, LTD., as a Lender
                         By: CypressTree Investment Management Company, Inc.,
                         as Portfolio Manager


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________


                         CYPRESSTREE SENIOR FLOATING RATE FUND, as a Lender
                         By: CypressTree Investment Management Company, Inc., as
                         Portfolio Manager


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________

<PAGE>

                         NORTH AMERICAN SENIOR FLOATING RATE FUND, as a Lender
                         By: CypressTree Investment Management Company, Inc., as
                         Portfolio Manager


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________
<PAGE>

                         NIB CAPITAL BANK N.V., as a Lender


                         By:_________________________________________________
                            Name:____________________________________________
                            Title:___________________________________________


                         By:_________________________________________________
                            Name:____________________________________________
                            Title:___________________________________________
<PAGE>

                         DRESDNER BANK AG, NEW YORK AND GRAND CAYMAN BRANCHES,
                         as a Lender


                         By:           /s/
                            ---------------------------------------------
                            Name:  Patrick A. Keleher
                            Title: First Vice President


                         By:           /s/
                            ----------------------------------------------
                            Name:  Brian Schneider
                            Title: Assistant Vice President
<PAGE>

                         EATON VANCE CDO III, LTD., as a Lender
                         By: Eaton Vance Management, as Investment Advisor


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________


                         EATON VANCE INSTITUTIONAL SENIOR LOAN FUND, as a Lender
                         By: Eaton Vance Management, as Investment Advisor


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________


                         EATON VANCE SENIOR INCOME TRUST, as a Lender
                         By: Eaton Vance Management, as Investment Advisor


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________


                         GRAYSON & CO., as a Lender
                         By: Boston Management and Research, as Investment
                         Advisor


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________

<PAGE>

                         OXFORD STRATEGIC INCOME FUND, as a Lender
                         By: Eaton Vance Management, as Investment Advisor


                         By:_________________________________________________
                            Name:____________________________________________
                            Title:___________________________________________


                         SENIOR DEBT PORTFOLIO, as a Lender
                         By: Boston Management and Research, as Investment
                         Advisor


                         By:_________________________________________________
                            Name:____________________________________________
                            Title:___________________________________________
<PAGE>

                         ERSTE BANK DER OESTERREICHISCHEN SPARKASSEN AG, as a
                         Lender


                         By:_________________________________________________
                            Name:____________________________________________
                            Title:___________________________________________


                         By:_________________________________________________
                            Name:____________________________________________
                            Title:___________________________________________
<PAGE>

                         FC-CBO II LIMITED, as a Lender


                         By:           /s/
                            -----------------------------------------
                            Name:____________________________________
                            Title:___________________________________
<PAGE>

                         FIDELITY ADVISOR SERIES II: FIDELITY ADVISOR HIGH
                         INCOME FUND, as a Lender


                         By:_________________________________________
                            Name:____________________________________
                            Title:___________________________________


                         VARIABLE INSURANCE PRODUCTS FUND II: ASSET MANAGER
                         PORTFOLIO, as a Lender


                         By:_________________________________________
                            Name:____________________________________
                            Title:___________________________________


                         VARIABLE INSURANCE PRODUCTS FUND II: ASSET MANAGER
                         GROWTH PORTFOLIO, as a Lender


                         By:_________________________________________
                            Name:____________________________________
                            Title:___________________________________
<PAGE>

                         FIRST DOMINION FUNDING III, as a Lender


                         By:_________________________________________
                            Name:____________________________________
                            Title:___________________________________
<PAGE>

                         FIRST UNION NATIONAL BANK, as a Lender


                         By:           /s/
                            -----------------------------------------
                            Name:  Mark L. Cook
                            Title: Senior Vice President
<PAGE>

                         FLEET NATIONAL BANK, as a Lender


                         By:_________________________________________
                            Name:____________________________________
                            Title:___________________________________
<PAGE>

                         FORTIS CAPITAL CORP., as a Lender


                         By:_________________________________________
                            Name:____________________________________
                            Title:___________________________________


                         By:_________________________________________
                            Name:____________________________________
                            Title:___________________________________
<PAGE>

                         FRANKLIN FLOATING RATE TRUST, as a Lender


                         By:_________________________________________
                            Name:____________________________________
                            Title:___________________________________
<PAGE>

                         THE FUJI BANK, LIMITED, as a Lender


                         By:_________________________________________
                            Name:____________________________________
                            Title:___________________________________
<PAGE>

                         GALAXY CLO 1999-1, LTD., as a Lender
                         By:SAI Investment Adviser, Inc.,
                         its Collateral Agent


                         By:_________________________________________
                            Name:____________________________________
                            Title:___________________________________
<PAGE>

                         GENERAL ELECTRIC CAPITAL CORPORATION, as a
                         Lender


                         By:           /s/
                            -----------------------------------------
                            Name:  Brian P. Ward
                            Title: Manager - Operations
<PAGE>

                         HOWARD BANK, N.A., as a Lender


                         By:           /s/
                            -----------------------------------------
                            Name:____________________________________
                            Title:___________________________________
<PAGE>

                         IBM CREDIT CORPORATION, as a Lender


                         By:              /s/
                            ----------------------------------------------------
                            Name: Ronald J. Bachner
                            Title: Manager
<PAGE>

                         KEMPER FLOATING RATE FUND, as a Lender


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________
<PAGE>

                         KEY CORPORATE CAPITAL INC., as a Lender


                         By:                 /s/
                            ----------------------------------------------------
                            Name: Jason R. Weaver
                            Title: Senior Vice President
<PAGE>

                         KZH CYPRESSTREE-1 LLC, as a Lender


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________


                         KZH ING-1 LLC, as a Lender


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________


                         KZH ING-2 LLC, as a Lender


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________


                         KZH ING-3 LLC, as a Lender


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________



                         KZH RIVERSIDE LLC, as a Lender


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________
<PAGE>

                         KZH SHOSHONE LLC, as a Lender


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________


                         KZH SOLEIL-2 LLC, as a Lender


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________


                         KZH STERLING LLC, as a Lender


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________
<PAGE>

                         LEHMAN COMMERCIAL PAPER INC., as a Lender



                         By:                   /s/
                            ----------------------------------------------------
                            Name: G. Andrew Keith
                            Title: Authorized Signatory
<PAGE>

                         MAGNETITE ASSET INVESTORS III L.L.C., as a Lender


                         By:                      /s/
                            ----------------------------------------------------
                            Name:_______________________________________________
                            Title:______________________________________________
<PAGE>

                         MERRILL LYNCH GLOBAL INVESTMENT SERIES: INCOME
                         STRATEGIES PORTFOLIO, as a Lender
                         By: Merrill Lynch Investment Managers, L.P., as
                             Investment Advisor


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________


                         MERRILL LYNCH PRIME RATE PORTFOLIO, as a Lender
                         By: Merrill Lynch Investment Managers, L.P., as
                             Investment Advisor


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________


                         MASTER SENIOR FLOATING RATE TRUST, as a Lender


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________


                         MERRILL LYNCH SENIOR FLOATING RATE FUND, INC., as a
                         Lender


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________
<PAGE>

                         SENIOR HIGH INCOME PORTFOLIO, INC., as a Lender


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________


                         DEBT STRATEGIES FUND, INC., as a Lender


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________


                         LONGHORN CDO (CAYMAN) LTD., as a Lender
                         By: Merrill Lynch Asset Management, L.P., as Attorney
                             In Fact


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________
<PAGE>

                         METROPOLITAN LIFE INSURANCE COMPANY, as a Lender


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________
<PAGE>

                         THE MITSUBISHI TRUST AND BANKING CORPORATION, as a
                         Lender


                         By:                    /s/
                            ----------------------------------------------------
                            Name: Toshihiro Hayashi
                            Title: Senior Vice President
<PAGE>

                         MONY LIFE INSURANCE COMPANY, as a Lender


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________
<PAGE>

                         MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST, as a
                         Lender


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________
<PAGE>

                         MOUNTAIN CAPITAL CLO I, LTD., as a Lender


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________
<PAGE>

                         MUIRFIELD TRADING LLC, as a Lender


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________


                         OLYMPIC FUNDING TRUST, SERIES 1999-1, as a Lender


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________


                         PPM SPYGLASS FUNDING TRUST, as a Lender


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________


                         WINGED FOOT FUNDING TRUST, as a Lender


                         By:                    /s/
                            ----------------------------------------------------
                            Name: Ann E. Morris
                            Title: Authorized Agent
<PAGE>

                         NATEXIS BANQUES POPULAIRES, as a Lender


                         By:                   /s/
                            ----------------------------------------------------
                            Name: Cynthia E. Sachs
                            Title: VP, Group Manager


                         By:                   /s/
                            ----------------------------------------------------
                            Name: Elizabeth A. Harker
                            Title: Assistant Vice President
<PAGE>

                         NATIONAL CITY BANK, as a Lender


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________
<PAGE>

                         OCTAGON INVESTMENT PARTNERS II, LLC, as a Lender
                         By: Octagon Credit Investors, LLC, as sub-investment
                         manager


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________


                         OCTAGON INVESTMENT PARTNERS III, LTD., as a Lender
                         By: Octagon Credit Investors, LLC, as Portfolio
                         Manager


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________
<PAGE>

                         OPPENHEIMER SENIOR FLOATING RATE FUND, as a Lender


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________
<PAGE>

                         ING PILGRIM SENIOR INCOME FUND, as a Lender
                         By: ING Pilgrim Investments, Inc., as its investment
                         manager


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________


                         ML CLO XV PILGRIM AMERICA (CAYMAN) LTD., as a Lender
                         By: Pilgrim Investments, Inc., as its investment
                         manager


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________


                         ML CLO XX PILGRIM AMERICA (CAYMAN) LTD., as a Lender
                         By: Pilgrim Investments, Inc., as its investment
                         manager


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________


                         PILGRIM CLO 1999-1 LTD., as a Lender
                         By: Pilgrim Investments, Inc., as its investment
                         manager


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________
<PAGE>

                         PILGRIM PRIME RATE TRUST, as a Lender
                         By: Pilgrim Investments, Inc., as its investment
                         manager


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________


                         SEQUILS-PILGRIM 1, LTD., as a Lender
                         By: Pilgrim Investments, Inc., as its investment
                         manager


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________
<PAGE>

                         PNC BANK, NATIONAL ASSOCIATION, as a Lender


                         By:____________________________________________________
                            Name:_______________________________________________
                            Title:______________________________________________
<PAGE>

                         ROYAL BANK OF CANADA, as a Lender


                         By:           /s/
                            ----------------------------------------
                            Name:  Charles Romano
                            Title: Senior Manager
<PAGE>

                         SANKATY HIGH YIELD PARTNERS II, L.P., as a Lender
                         under the Loan Agreement


                         By:           /s/
                            ----------------------------------------------------
                            Name:  Diane J. Exter
                            Title: Managing Director, Portfolio Manager


                         Sankaty Advisors, Inc. as Collateral Manager for GREAT
                         POINT CLO 1999-1 LTD., as Term Lender and as a Lender
                         under the Loan Agreement


                         By:           /s/
                            ----------------------------------------------------
                            Name:  Diane J. Exter
                            Title: Managing Director, Portfolio Manager
<PAGE>

                         SEABOARD CLO 2000 LTD, as a Lender


                         By:_____________________________________________
                            Name:________________________________________
                            Title:_______________________________________
<PAGE>

                         SENECA CBO II, L.P., as a Lender


                         By:           /s/
                            ---------------------------------------
                            Name:  Charles Dicke
                            Title: Partner


                         SENECA CBO III, LIMITED, as a Lender


                         By:           /s/
                            ---------------------------------------
                            Name:  Charles Dicke
                            Title: Partner
<PAGE>

                         SEQUILS-CUMBERLAND I, LTD., as a Lender
                         By: Deerfield Capital Management, L.L.C., as its
                         Collateral Manager


                         By:________________________________________________
                            Name:___________________________________________
                            Title:__________________________________________


                         SEQUILS-CUMBERLAND I, LLC., as a Lender
                         By: Deerfield Capital Management, L.L.C., as its
                         Collateral Manager


                         By:________________________________________________
                            Name:___________________________________________
                            Title:__________________________________________
<PAGE>

                         SUNTRUST BANK, as a Lender


                         By:_________________________________________
                            Name:____________________________________
                            Title:___________________________________
<PAGE>

                         TEXTRON FINANCIAL CORPORATION, as a Lender


                         By:           /s/
                            -----------------------------------------------
                            Name:  Matthew J. Colgan
                            Title: Director
<PAGE>

                         TITANIUM CBO I, LTD., as a Lender


                         By:           /s/
                            -------------------------------------------
                            Name:______________________________________
                            Title:_____________________________________
<PAGE>

                         UNION BANK OF CALIFORNIA, N.A., as a Lender


                         By:           /s/
                            ------------------------------------------------
                            Name:  Stender F. Sweeney, II
                            Title: Vice President
<PAGE>

                         VAN KAMPEN CLO I, LIMITED, as a Lender
                         By: Van Kampen Management, Inc., as Collateral Manager


                         By:           /s/
                            ----------------------------------------------------
                            Name:  Darvin D. Pierce
                            Title: Principal


                         VAN KAMPEN CLO II, LIMITED, as a Lender
                         By: Van Kampen Management, Inc., as Collateral Manager


                         By:           /s/
                            ----------------------------------------------------
                            Name:  Darvin D. Pierce
                            Title: Principal


                         VAN KAMPEN SENIOR INCOME TRUST, as a Lender
                         By: Van Kampen Investment Advisory Corp.


                         By:           /s/
                            ----------------------------------------------------
                            Name:  Darvin D. Pierce
                            Title: Principal
<PAGE>

                         WEBSTER BANK, as a Lender


                         By:____________________________________________
                            Name:_______________________________________
                            Title:______________________________________