Document:

<PAGE>

                                                                   EXHIBIT 10.10

EXCEPT AS PROVIDED IN SECTION 8(b) HEREOF, THIS WARRANT MAY NOT BE TRANSFERRED.
THE SHARES OF COMMON STOCK ISSUED OR ISSUABLE UPON EXERCISE OF THIS WARRANT ARE
SUBJECT TO THE RESTRICTIONS ON TRANSFER SET FORTH IN SECTION 4 OF THIS WARRANT.

                                  iPCS, INC.

                                                             For the purchase of
                                                             1,151,938 shares of
                                                                    Common Stock

                          WARRANT FOR THE PURCHASE OF
                            SHARES OF COMMON STOCK
                                      OF
                                  iPCS, INC.
                           (A Delaware Corporation)

VOID AFTER 5:00 P.M., EASTERN STANDARD TIME, ON JULY 12, 2007.

     iPCS, Inc., a Delaware corporation (the "Company") hereby certifies that
SPRINT SPECTRUM L.P., a Delaware limited partnership (together with its
permitted assigns, the "Registered Holder"), is entitled, subject to the terms
set forth below, to purchase from the Company, at any time or from time to time
on or after July 12, 2001 and on or before July 12, 2007, at not later than 5:00
p.m. (Eastern Standard Time), 1,151,938 shares of Common Stock, $0.01 par value,
of the Company ("Common Stock"), at a purchase price of $4.95 per share. The
number of shares of Common Stock purchasable upon exercise of this Warrant, and
the purchase price per share, each as adjusted from time to time pursuant to the
provisions of this Warrant, are hereinafter referred to as the "Warrant Stock"
and the "Purchase Price", respectively.

1.   Exercise.

     (a)  This Warrant may be exercised by the Registered Holder, in whole or in
part, by surrendering this Warrant, with the purchase form appended hereto as
Exhibit I duly executed by such Registered Holder, at the principal office of
the Company, or at such other office or agency as the Company may designate,
accompanied by payment in full, by bank or certified check in lawful money of
the United States, of the Purchase Price payable in respect of the number of
shares of Warrant Stock purchased upon such exercise.

     (b)  Each exercise of this Warrant shall be deemed to have been effected
immediately prior to the close of business on the day on which this Warrant
shall have been surrendered to the Company as provided in subsection 1(a) above.
At such time, the person or persons in whose name or names any certificates for
Warrant Stock shall be issuable upon such exercise as provided in subsection
1(c) below shall be deemed to have become the holder or holders of record of the
Warrant Stock represented by such certificates.
<PAGE>

     (c)  As soon as practicable after the exercise of this Warrant in full or
in part, and in any event within ten (10) days thereafter, the Company at its
expense will cause to be issued in the name of, and delivered to, the Registered
Holder, or, subject to the terms and conditions hereof, as the Registered Holder
(upon payment by the Registered Holder of any applicable transfer taxes) may
direct:

          (i)  a certificate or certificates for the number of full shares of
               Warrant Stock to which such Registered Holder shall be entitled
               upon such exercise plus, in lieu of any fractional shares to
               which such Registered Holder would otherwise be entitled, cash in
               an amount determined pursuant to Section 3 hereof, and

          (ii) in case such exercise is in part only, a new warrant or warrants
               (dated the date hereof) of like tenor, calling in the aggregate
               on the face or faces thereof for the number of shares of Warrant
               Stock equal (without giving effect to any adjustment therein) to
               the number of such shares called for on the face of this Warrant
               minus the number of such shares purchased by the Registered
               Holder upon such exercise as provided in subsection 1(a) above.

2.   Adjustments.

     (a)  If the outstanding shares of the Company's Common Stock shall be
subdivided into a greater number of shares or a dividend in Common Stock shall
be paid in respect of Common Stock, the Purchase Price in effect immediately
prior to such subdivision or at the record date of such dividend shall
simultaneously with the effectiveness of such subdivision or immediately after
the record date of such dividend be proportionately reduced. If the outstanding
shares of Common Stock shall be combined into a smaller number of shares, the
Purchase Price in effect immediately prior to such combination shall,
simultaneously with the effectiveness of such combination, be proportionately
increased. When any adjustment is required to be made in the Purchase Price, the
number of shares of Warrant Stock purchasable upon the exercise of this Warrant
shall be changed to the number determined by dividing (i) an amount equal to the
number of shares issuable upon the exercisable of this Warrant immediately prior
to such adjustment, multiplied by the Purchase Price in effect immediately prior
to such adjustment, by (ii) the Purchase Price in effect immediately after such
adjustment.

     (b)  If there shall occur any capital reorganization or reclassification of
the Company's Common Stock (other than a change in par value or a subdivision or
combination as provided for in subsection 2(a) above), or any consolidation or
merger of the Company with or into another corporation, or a transfer of all or
substantially all of the assets of the Company, or the payment of a liquidating
distribution then, as part of any such reorganization, reclassification,
consolidation, merger, sale or liquidating distribution, lawful provision shall
be made so that the Registered Holder of this Warrant shall have the right
thereafter to receive upon

                                       2
<PAGE>

the exercise hereof (to the extent, if any, still exercisable) the kind and
amount of shares of stock or other securities or property which such Registered
Holder would have been entitled to receive if, immediately prior to any such
reorganization, reclassification, consolidation, merger, sale or liquidating
distribution, as the case may be, such Registered Holder had held the number of
shares of Common Stock which were then purchasable upon the exercise of this
Warrant. In any such case, appropriate adjustment (as reasonably determined by
the Board of Directors of the Company) shall be made in the application of the
provisions set forth herein with respect to the rights and interests thereafter
of the Registered Holder of this Warrant such that the provisions set forth in
this Section 2 (including provisions with respect to adjustment of the Purchase
Price) shall thereafter be applicable, as nearly as is reasonably practicable,
in relation to any shares of stock or other securities or property thereafter
deliverable upon the exercise of this Warrant.

     (c)  In any case in which this Section 2 shall require that any adjustment
in the number of shares of Warrant Stock or other property for which this
Warrant may be exercised be made effective as of a record date for a specified
event, the Company may elect to defer until the occurrence of such event issuing
to the Registered Holder the amount of Warrant Stock and other property, if any,
issuable upon exercise of this Warrant after such record date that is over and
above the Warrant Stock and other property, if any, issuable upon exercise of
this Warrant as in effect prior to such adjustment; provided that upon request
the Company shall deliver to the Registered Holder a due bill or other
appropriate instrument evidencing the Registered Holder's right to receive such
additional shares or property upon the occurrence of the event requiring such
adjustment.

     (d)  When any adjustment is required to be made in the Purchase Price, the
Company shall promptly mail to the Registered Holder a certificate setting forth
the Purchase Price after such adjustment and setting forth a brief statement of
the facts requiring such adjustment. Such certificate shall also set forth the
kind and amount of stock or other securities or property for which this Warrant
shall be exercisable following the occurrence of any of the events specified in
subsection 2(a) or 2(b) above.

3.   Fractional Shares.

     The Company shall not be required upon the exercise of this Warrant to
issue any fractional shares, but shall make an adjustment therefor in cash on
the basis of the mean between the low bid and high asked prices of the Warrant
Stock on the market or exchange on which the stock of the Company then trades or
the closing market price of the Warrant Stock on a national securities exchange
on the trading day immediately prior to the date of exercise, whichever is
applicable, or if neither is applicable, then on the basis of the then market
value of the Warrant Stock as shall be reasonably determined by the Board of
Directors of the Company.

4.   Limitation on Sales; Registration.

     (a)  The Registered Holder, and each subsequent holder of this Warrant, if
any, acknowledges that this Warrant and the Warrant Stock have not been
registered under the

                                       3
<PAGE>

Securities Act of 1933, as now in force or hereafter amended, or any successor
legislation (the "Act"), and agrees not to sell, pledge, distribute, offer for
sale, transfer or otherwise dispose of this Warrant or any Warrant Stock issued
upon its exercise in the absence of (i) an effective registration statement
under the Act as to this Warrant or such Warrant Stock and registration or
qualification of this Warrant or such Warrant Stock under any applicable Blue
Sky or state securities law then in effect, or (ii) an opinion of counsel,
satisfactory to the Company and the Registered Holder, that such registration
and qualification are not required. Without limiting the generality of the
foregoing, unless the offering and sale of the Warrant Stock to be issued upon
the particular exercise of this Warrant shall have been effectively registered
under the Act, the Company shall be under no obligation to issue the shares
covered by such exercise unless and until the Registered Holder shall have
executed an investment letter in form and substance satisfactory to the Company,
including a warranty at the time of such exercise that it is acquiring such
shares for its own account, for investment and not with a view to, or for sale
in connection with, the distribution of any such shares, in which event the
Registered Holder shall be bound by the provisions of a legend to such effect on
the certificate(s) representing the Warrant Stock. In addition, without limiting
the generality of the foregoing, the Company may delay issuance of the Warrant
Stock until completion of any action or obtaining of any consent, which the
Company deems necessary under any applicable law (including without limitation
state securities or "blue sky" laws).

     (b)  Upon the exercise of this Warrant in full, if the Company is then
eligible to register Common Stock under the Act on Form S-3, the Company shall,
as soon as practicable thereafter but in no event later than 45 days following
such exercise, file a registration statement on Form S-3 covering the Warrant
Stock issuable upon such exercise (a "Sprint Registration Statement") and, after
such filing, the Company shall use reasonable efforts to cause such Sprint
Registration Statement to become effective and to maintain the effectiveness
thereof for a period of one (1) year, or until such earlier date as such Warrant
Stock may be transferred without registration under the Act; provided that (i)
the effectiveness of the Sprint Registration Statement may be terminated earlier
if and to the extent that all of the Warrant Stock shall have been disposed of
by the holder or holders thereof and (ii) the Company's obligation under this
Section 3(b) to file a Sprint Registration Statement as soon as practicable and
to use reasonable efforts to cause such Sprint Registration Statement to become
effective shall be suspended in the event and during such period as certain
circumstances exist (such circumstances being hereinafter referred to as a
"Suspension Event") which would make it impractical or inadvisable in the
Company's good faith opinion to file a Sprint Registration Statement, but such
suspension shall only continue until (y) such event is no longer continuing or
(z) ninety (90) days after the commencement of such suspension, whichever is
earlier. A Suspension Event shall include, but shall not be limited to, (1) an
underwritten primary offering by the Company if the Company is advised in
writing by the managing underwriter of such underwritten offering that, in its
good faith judgment, the sale of securities under a Sprint Registration
Statement would interfere with the successful marketing of the securities to be
offered under such primary offering; (2) pending negotiation relating to, or
existence of any other event, fact or circumstances which would require
disclosure by the Company in the Sprint Registration Statement of information
regarding the Company or its business, business plans, financial condition or
results of operations which

                                       4
<PAGE>

has not previously been disclosed by the Company in a report filed under the
Securities Exchange Act of 1934, as amended, or by public announcement; or (3)
if the holder or holders of Warrant Stock on whose behalf the Sprint
Registration Statement is being prepared fails to cooperate with the Company and
to furnish to the Company all information in connection with the preparation of
the Sprint Registration Statement as the Company may reasonably request.

     (c)  All fees and expenses incurred by the Company in connection with the
performance of its obligation to register the Warrant Stock pursuant to
subsection 3(b) shall be borne by the Company; provided that, in the event of
any underwritten offering of such Warrant Stock, all underwriting discounts and
selling commissions, if any, fees and expenses of the holder or holders thereof
or of its or their counsel, and transfer taxes applicable to the sale of such
Warrant Stock, shall be borne by such holder or holders.

     (d)  If applicable, the Company shall provide timely notice to the market
on which the stock of the Company then trades of its intent to issue Warrant
Stock to the Registered Holder upon the exercise of this Warrant, and shall
comply in full with any and all requirements of such market applicable to the
issuance, listing and trading of such shares of Warrant Stock subsequent to such
issuance.

     (e)  The Registered Holder agrees, and each other holder of Warrant Stock
agrees, if requested by the Company or the representative of the underwriters
underwriting an offering of Common Stock (or other securities of the Company)
from time to time, not to sell or otherwise transfer or dispose of any Warrant
Stock then held by the Registered Holder or such other holder during such period
of time following the effective date of any registration statement of the
Company (other than the Sprint Registration Statement) filed under the Act for
the period of time with respect to which a majority of the executive officers of
the Company agree not to sell shares of Common Stock (or other securities of the
Company). Such agreement shall be in writing in a form satisfactory to the
Company and such representative. The Company may impose stop-transfer
instructions with respect to the Warrant Stock subject to the foregoing
restriction until the end of such period.

5.   Notices of Record Date, Etc.

     In the event that:

     (a)  the Company shall set a record date for the purpose of entitling or
          enabling the holders of its Common Stock (or other stock or securities
          at the time deliverable upon the exercise of this Warrant) to receive
          any dividend or other distribution (other than a dividend payable
          solely in Common Stock or out of funds legally available therefor), or
          to receive any right to subscribe for or purchase any shares of stock
          of any class or any other securities, or to receive any other right,
          or

     (b)  there shall occur any capital reorganization of the Company, any
          reclassification of the capital stock of the Company, any
          consolidation or merger of the Company

                                       5
<PAGE>

          with or into another corporation (other than a consolidation or merger
          in which the Company is the surviving entity), or any transfer of all
          or substantially all of the assets of the Company, or

     (c)  there shall occur any voluntary or involuntary dissolution,
          liquidation or winding-up of the Company,

then, and in each such case, the Company will mail or cause to be mailed to the
Registered Holder a notice specifying, as the case may be, (i) the record date
for the purpose of such dividend, distribution or right, and stating the amount
and character of such dividend, distribution or right, (ii) the effective date
of such reorganization, reclassification, consolidation, merger or transfer or
(iii) the date of such dissolution, liquidation or winding-up is to take place,
and also specifying, if applicable, the date and time as of which the holders of
record of Common Stock (or such other stock or securities at the time
deliverable upon the exercise of this Warrant) shall be entitled to exchange
their shares of Common Stock (or such other stock or securities) for securities
or other property deliverable upon such organization, reclassification,
consolidation, merger, transfer, dissolution, liquidation or winding-up. Such
notice shall be mailed at least ten (10) days prior to the record date or
effective date for the event specified in such notice, provided that the failure
to so mail such notice shall affect the legality or validity of any such action.

6.   Reservation of Stock.

     The Company will at all times reserve and keep available, solely for
issuance and delivery upon the exercise of this Warrant, such shares of Warrant
Stock and other stock, securities and property, as from time to time shall be
issuable upon the exercise of this Warrant.

7.   Replacement of Warrants.

     Upon receipt of evidence reasonably satisfactory to the Company of the
loss, theft, destruction or mutilation of this Warrant and (in the case of loss,
theft or destruction) upon delivery of an indemnity agreement (with surety if
reasonably required) in an amount reasonably satisfactory to the Company, or (in
the case of mutilation) upon surrender and cancellation of this Warrant, the
Company will issue, in lieu thereof, a new Warrant of like tenor.

8.   Transfers, Etc.

     (a)  The Company will maintain a register containing the names and
addresses of the Registered Holders of this Warrant. The Registered Holder may
change its, his or her address as shown on the warrant register by written
notice to the Company requesting such change.

     (b)  This Warrant shall not be transferable by the Registered Holder and
shall be exercisable only by the Registered Holder, provided that this Warrant
may be transferred to, and may be exercisable by, any company that directly, or
indirectly through one or more

                                       6
<PAGE>

intermediaries, controls, is controlled by, or is under common control with, the
Registered Holder. Subject to the foregoing, this Warrant shall not be assigned,
pledged or hypothecated in any way (whether by operation of law or otherwise)
and shall not be subject to execution, attachment or similar process without the
prior written consent of the Company. Any attempted transfer, assignment,
pledge, hypothecation or other disposition of this Warrant or of any rights
granted hereunder contrary to the provisions of this Section 8, or the levy of
any attachment or similar process upon this Warrant or such rights, shall be
null and void.

     (c)  Until any transfer of this Warrant is made in the warrant register,
the Company may treat the Registered Holder of this Warrant as the absolute
owner hereof for all purposes; provided, however, that if and when this Warrant
is properly assigned in blank, the Company may (but shall not be obligated to)
treat the bearer hereof as the absolute owner hereof for all purposes,
notwithstanding any notice to the contrary.

9.   Mailing of Notices, Etc.

     All notices and other communications from the Company to the Registered
Holder of this Warrant shall be mailed by first-class certified or registered
mail, postage prepaid, to the address furnished to the Company in writing by the
last Registered Holder of this Warrant who shall have furnished an address to
the Company in writing. All notices and other communications from the Registered
Holder of this Warrant or in connection herewith to the Company shall be mailed
by first-class certified or registered mail, postage prepaid, to the Company at
its offices at 121 West First Street, Suite 200, Geneseo, Illinois, 61254,
Attention: Timothy M. Yager, or such other address as the Company shall so
notify the Registered Holder.

10.  No Rights as Stockholder.

     Until the exercise of this Warrant, the Registered Holder of this Warrant
shall not have or exercise any rights by virtue hereof as a stockholder of the
Company.

11.  Change or Waiver.

     Any term of this Warrant may be changed or waived only by an instrument in
writing signed by the party against which enforcement of the change or waiver is
sought.

12.  Headings.

     The headings in this Warrant are for purposes of reference only and shall
not limit or otherwise affect the meaning of any provision of this Warrant.

13.  Governing Law.

     This Warrant will be governed by and construed in accordance with the laws
of the State of Illinois.

                                       7
<PAGE>

                                  iPCS, INC.

                              By: /s/ Timothy M. Yager
                                  ---------------------------
Dated: July 12, 2000          Name:   Timothy M. Yager
                              Title:  President and Chief Executive Officer

                                       8
<PAGE>

                                   EXHIBIT I

                                 PURCHASE FORM

To:  iPCS, INC.
     121 West First Street, Ste. 200
     Geneseo, Illinois 61254
     Attention: Timothy M. Yager

     The undersigned pursuant to the provisions set forth in the attached
Warrant, hereby irrevocably elects to purchase ________________________ shares
of Common Stock (the "Common Stock") covered by such Warrant and herewith makes
payment of $__________, representing the full purchase price for such shares at
the price per share provided for in such Warrant.

     The undersigned understands and acknowledges the terms and restrictions on
the right to transfer or dispose of the Common Stock set forth in Sections 4 and
7 of the attached Warrant, which the undersigned has carefully reviewed. The
undersigned consents to the placing of a legend on its certificate for the
Common Stock referring to such restrictions and the placing of stop transfer
orders until the Common Stock may be transferred in accordance with the terms of
such restrictions.

                         [REGISTERED HOLDER or its permitted assignee]

                         By: _________________________________________
                              Name: __________________________________
                              Title: _________________________________

                                    Dated: ___________________________

                                       9<PAGE>

                                                                   Exhibit 10.11

                       AGREEMENT REGARDING CONSTRUCTION,
                       ---------------------------------
                         SALE AND LEASEBACK OF TOWERS
                         ----------------------------

     THIS AGREEMENT ("Agreement"), by and among ILLINOIS PCS, LLC, an Illinois
limited liability company ("ILPCS") and AMERICAN TOWER CORPORATION, a Delaware
corporation, ("Purchaser"), shall be dated as of the Effective Date specified in
Section 17(f) below.

RECITALS:
--------

     A.   ILPCS is in the process of identifying sites for, and developing,
constructing, and using, telecommunications towers to facilitate the operations
of a PCS communications system. Purchaser is in the business of, among other
things, purchasing, marketing, managing and operating telecommunications towers.

     B.   ILPCS and Purchaser intend that this Agreement be effective with
respect to between sixty (60) and eighty (80) wireless communication towers,
with the intent that ILPCS will locate sites for, develop and construct the
towers, Purchaser will then purchase, market and operate the towers, and ILPCS
will become a principal tenant of Purchaser on the towers, all as more
particularly set forth below.

TERMS AND CONDITIONS:
--------------------

     NOW, THEREFORE, in consideration of the Recitals stated above, and the
respective rights, duties and obligations of the parties as set forth below,
ILPCS and Purchaser agree as follows:

     1.   Purchase and Sale of Certain Assets; Ground Leases; Purchase Price.
          ------------------------------------------------------------------
(a)  In consideration of and upon the terms and conditions set forth in this
Agreement, ILPCS and Purchaser agree that Purchaser shall purchase from ILPCS
certain telecommunication towers as provided herein and assume the ground leases
for the necessary and appropriate parcels of real estate on which such towers
are located (which are to be procured under ground leases by ILPCS); Purchaser
shall coordinate the assignment to it from ILPCS of all federal, state and local
licenses, permits and other legal authorizations required for the use thereof
(the towers and equipment rooms shall herein be called the "Towers"); Purchaser
shall receive all rights appurtenant to the real estate leased as described
above (the real estate leased shall be called the "Real Property;" while such
rights appurtenant to the Real Property as provided in the relevant lease shall
be called the "Appurtenances"); and Purchaser shall receive all business records
pertaining to the construction and operation of the Towers (the "Records").  For
purposes of this Agreement, the Towers, Appurtenances and Records are
collectively referred to herein as the "Assets."

          (b)  ILPCS has identified tentative locations for Towers in the
fourteen (14) Basic Trading Areas ("BTAs"), which BTAs and locations are more
particularly described on Exhibit 1 attached hereto and incorporated herein by
                          ---------
reference, where ILPCS intends to develop and construct Towers, then sell such
Towers to Purchaser and lease back Tower space from Purchaser.  Exhibit 1
                                                                ---------
<PAGE>

may be revised from time to time by ILPCS to remove inappropriate or unfeasible
sites and to add new sites, provided that the total number of Towers to be
subject to this Agreement shall not be less than sixty (60). Exhibit 1 shall be
                                                             ---------
modified as required to include all Towers of 150' in height or greater that are
built by or for ILPCS within the 14 BTA's referenced above and within the twelve
(12) months following conveyance to Purchaser of the first group of Towers
hereunder. Purchaser shall have the right to reject up to seven (7) Towers for
any reason, or for no reason, without being in default under the terms of this
Agreement.

          (c)  ILPCS shall enter into a fully assignable ground lease ("Ground
Lease") from the landowner(s) for each Tower site it finally selects and develop
and construct a Tower thereon. Except with the prior written consent of
Purchaser, which may not be unreasonably withheld or delayed, the parties agree
that the terms of each Ground Lease shall not be materially less favorable to
the ground lessee than either the terms set forth on Exhibit 2 attached hereto
                                                     ---------
and incorporated herein by this reference or as provided in the form of Option
and Lease Agreement attached hereto as Exhibit 3 and incorporated herein by this
                                       ---------
reference, it being agreed that ILPCS shall endeavor to execute the Ground Lease
in substantially the form set out as Exhibit 3 whenever and to the greatest
                                     ---------
extent possible.  The parties anticipate that the actual average monthly ground
rents payable under the Ground Leases for all of the Tower sites (the "Actual
Average Rent") as determined at the time of the Closing by Purchaser on the last
of the Towers acquired by Purchaser to fulfill its obligations under this
Agreement (the "Final Closing") shall not be more than $350.00 (the "Estimated
Average Rent").  The parties agree that the monthly rent to be provided in the
Master Lease to be paid by ILPCS to Purchaser for Tower space on each Tower
acquired by Purchaser will be $1,100 plus an annual 3% escalator (the "Tower
Rent") for a ten (10) year initial term with three (3) five (5) year renewal
options (the "Initial Tower Lease Term").  The parties also agree that, to the
extent the Actual Average Rent shall differ from the Estimated Average Rent, an
additional payment (the "Land Rent Differential Payment") shall be made, which
shall be calculated as follows:  the amount of the difference between the Actual
Average Rent and the Estimated Average Rent, multiplied by the number of Towers
acquired by Purchaser under this Agreement (excluding any "Short Towers" as
defined in Section 17(g)).  In the event the Actual Average Rent shall exceed
the Estimated Average Rent, the Land Rent Differential Payment shall be paid by
ILPCS to Purchaser.  In the event the Estimated Average Rent shall exceed the
Actual Average Rent, the Land Rent Differential Payment shall be paid by
Purchaser to ILPCS.  The Land Rent Differential Payment shall be calculated by
ILPCS within ten (10) days of the Final Closing and promptly confirmed by
Purchaser, and shall thereafter be paid monthly on the same day of the month as
the Tower Rent payments are due, with the first such payment being due in the
month following the month in which the Final Closing occurs.  The Land Rent
Differential Payment shall be reduced by a pro-rata amount for each Tower at the
time the Initial Tower Lease Term for that Tower ends, and shall continue only
until the expiration of the longest Initial Tower Lease Term for any Tower.  The
purchase price for each Tower shall be Two Hundred Fifty Thousand Dollars
($250,000), which shall be adjusted at Closing as provided in this Agreement
(the "Purchase Price") and shall be paid in cash, certified or other immediately
available funds, including by wire transfer.  Neither the monthly rents payable
by Purchaser under the Ground Leases, nor the Tower Rent, nor the Purchase
Price, shall be affected by the prospect or actuality of additional tenants for
space on any Tower(s).

                                       2
<PAGE>

          (d)  Upon the execution of this Agreement, Purchaser shall deliver to
ILPCS in immediately available funds the amount of Two Million dollars
($2,000,000) as advance payment on the obligations of Purchaser hereunder (the
"Advance").  The Advance shall be unrestricted funds in ILPCS' possession and
shall be nonrefundable except as provided herein.  The Advance shall be credited
to the Purchase Price of the fifty-third (53rd) through sixtieth (60th) Towers
to be acquired by Purchaser under this Agreement, with this credit to occur at
the Closing for such Towers.  If for any reason the total amount of the Advance
shall not have been so credited and Purchaser shall have fulfilled its
obligations under this Agreement without default, any remaining balance of the
Advance shall be paid in the form of immediately available funds and delivered
to Purchaser at the Final Closing.  In the event of a default by ILPCS hereunder
that results in termination of this Agreement by Purchaser, the amount of the
Advance not yet applied as set out above shall be returned to Purchaser together
with interest thereon at the rate of five percent (5%) per annum from the date
of receipt thereof by ILPCS.  In the event of a default by Purchaser hereunder
that results in termination of this Agreement by ILPCS, the amount of the
Advance not yet applied as set out above shall be retained by ILPCS without
further obligation to Purchaser with respect to such amount.  In the event this
Agreement shall be terminated without default by either party, the amount of the
Advance not yet applied as set out above shall be returned to Purchaser without
payment of interest thereon.

     2.   Term.
          ----

     The term of this Agreement shall expire at the earlier of the Final
Closing, or December 31, 2000.

     3.   Development and Construction.
          ----------------------------

          (a)  The parties agree that the material specifications and
requirements for each Tower shall be no less favorable to Purchaser than those
set forth on Exhibit 4, attached hereto and incorporated herein by this
             ---------
reference.  Prior to the start of site development and Tower construction for
each site, or otherwise as soon as available, ILPCS shall deliver to Purchaser
all of each of the following types of documents that it has or has access to,
for Purchaser's review and information: Tower plans, specifications and work
drawings (collectively, the "Tower Specifications"); the applicable executed
Ground Lease; title examination and UCC search information; surveys; permits and
copies of permit applications (such as, but not necessarily limited to, land
use/zoning, building, FAA, FCC, NEPA); and environmental Phase I assessments and
other environmental information. All these documents shall be called
collectively the "Pre-Construction Deliverables."  Purchaser shall have the
right to suggest changes in the Tower Specifications at any time reasonably
early enough in the planning process for any Tower to allow due consideration of
such changes, and ILPCS shall in good faith consider implementing such changes;
provided however that ILPCS shall implement such changes only if (i) it
determines them to be practical in its sole discretion, and (ii) Purchaser
agrees to pay the costs directly associated with the requested changes.  ILPCS
also shall provide and identify the location of office space in an ILPCS project
office for one Purchaser field person, together with customary office support
(such as, but not necessarily limited to, typical office machines, work area,
and message-taking).

                                       3
<PAGE>

          (b)  ILPCS covenants and agrees that at least fifty percent (50%) of
the Towers to be constructed and sold to Purchaser that are at least 150' in
height (the "Qualifying Towers") shall be 195' in height or taller; and at least
seventy-five percent (75%) of the Qualifying Towers shall be 170' in height or
taller.

          (c)  ILPCS shall be fully responsible for all aspects of the
development and construction of the Towers.  Purchaser shall have ongoing and
continuous rights, with reasonable prior notice, to inspect and review each
Tower and the development and construction of, and all information pertaining
to, the Towers.  ILPCS shall routinely copy Purchaser on project status reports
that it prepares that contain status information regarding permitting,
construction matters, ground leasing, marketing or other Tower-related
information.  ILPCS shall attempt reasonably to use reputable and reliable
suppliers and contractors, and shall purchase or cause to be purchased for use
in the construction of Towers only new materials that meet industry and local
practices and standards.  Each Tower will be constructed in a good and
workmanlike manner and of a quality sufficient to pass without objection in the
industry.  To the extent transferable, any supplier or materialmen's warranties
shall be transferred to Purchaser at Closing for each Tower.

          (d)  Until the completion of Closing thereon, ILPCS shall retain full
ownership of each Tower and its related Assets, shall maintain property and
liability insurance on all insurable Assets, and shall bear all risk of loss
pertaining to such Tower and related Assets.

          (e)  Purchaser shall have the right to appoint a local field manager
for site management and marketing of Purchaser's interests relative to the
Towers.  Purchaser shall provide ILPCS the opportunity to interview the
contractor or any other person proposed by Purchaser to fill this position, and
ILPCS shall have the right to veto any such contractor or individual, or have
Purchaser replace such contractor without liability at any time if ILPCS
determines in good faith it cannot efficiently function with such contractor or
individual.  Purchaser shall have the right to attend and conduct an inspection
for each Tower at the same time as ILPCS conducts its inspection of the Tower
for the purpose of creating a final punchlist of items ("Punchlist Items") to be
completed on the Tower prior to ILPCS taking possession and making final payment
to its contractor for the Tower, and unless the parties otherwise agree in
writing, the Closing for any Tower shall not occur until the ("Punchlist Items")
shall have been completed.

     4.   Access to Information.  ILPCS will allow Purchaser, its
          ---------------------
representatives and lenders to have reasonable and mutually agreed access during
the term of this Agreement to the physical Assets within its control or custody,
whether prior to or following any Closing(s).  ILPCS will not unreasonably
withhold from Purchaser, its representatives and lenders any data, other than
financial information, that may be relevant to the development, construction,
marketing or operation of the Towers still under construction, as such data may
be requested hereafter by Purchaser.

     5.   Exclusivity; Confidentiality.  As long as Purchaser shall not be in
          ----------------------------
default under the terms of this Agreement, and except with respect to any Tower
that Purchaser does not purchase as allowed under this Agreement, ILPCS shall
not discuss or otherwise disclose the terms or conditions

                                       4
<PAGE>

of this Agreement with any third party person or entity; nor solicit, initiate
or in any way consider any submissions of any proposals from potential
purchasers of or investors in any Tower or proposed Tower sites as identified on
Exhibit 1, as that Schedule may be amended; nor furnish to potential purchasers
---------
or investors any information with respect to Purchaser or its operations.
Furthermore, all the parties hereto and their respective agents and
representatives shall not use for their personal benefit and shall not disclose,
directly or indirectly, any confidential or proprietary information of another
party hereto. The parties acknowledge that all of the information that either of
them shall receive from the other shall be deemed and treated as confidential
information except, and only to the extent, that any such information is
otherwise publicly available without a breach of this provision, and provided
further that either party shall be permitted to disclose such confidential
information to the limited extent that it may be obligated to do so by
applicable law or under order of a court of competent jurisdiction or other
similar requirement of a governmental agency, so long as the party required to
disclose the information provides the other party with reasonable prior written
notice of any required disclosure pursuant to such law, order or requirement and
the information to be disclosed is redacted to the fullest extent allowed
thereby.

     6.   ILPCS Representations and Warranties.  ILPCS represents and warrants
          ------------------------------------
to Purchaser as follows:

          (a)  Organization. ILPCS is a limited liability company duly formed,
               ------------
validly existing and in good standing under the laws of the State of Illinois.
ILPCS has full legal authority and power to enter into and perform as provided
for in this Agreement.

          (b)  Authorization; Enforceability.  The execution, delivery and
               -----------------------------
performance of this Agreement and all of the documents and instruments required
hereby of ILPCS and the consummation by ILPCS of the transactions contemplated
hereby are within the power of ILPCS and have been duly authorized by all
necessary action by ILPCS.  Those persons executing this Agreement on behalf of
ILPCS have the legal capacity to execute and deliver this Agreement and the
other documents and instruments required hereby.  This Agreement is, and the
other documents and instruments required hereby will be, when executed and
delivered by ILPCS, the valid and binding obligation of ILPCS, enforceable
against it in accordance with their respective terms, subject only to
bankruptcy, insolvency, reorganization, moratoriums or similar laws at the time
in effect affecting the enforceability or right of creditors generally and by
general equitable principles which may limit the right to obtain equitable
remedies.

          (c)  Absence of Conflicting Agreements.  The execution, delivery and
               ---------------------------------
performance of this Agreement by ILPCS neither do nor will, after the giving of
notice or the lapse of time or both, or otherwise:

               (i)   conflict with, result in a breach of, or constitute a
default under, any federal, state or local law, statute, ordinance, rule or
regulation applicable to ILPCS, or any court or administrative order or process,
or any material contract, agreement, arrangement, commitment or

                                       5
<PAGE>

plan to which ILPCS is a party or by which ILPCS is bound and which relates to
the ownership or operation of the Assets;

               (ii)  require the consent, waiver, approval, permit, license,
clearance or authorization of, or any declaration or filing with, any court or
governmental or public agency; or

               (iii) require the consent of any person under any material
agreement, arrangement or commitment of any nature to which ILPCS is a party or
bound or by or to which the Assets are bound or subject.

          (d)  No Litigation; Compliance with Laws.
               -----------------------------------

               (i)   There is no decree, judgment, order, investigation,
litigation at law or in equity, arbitration proceeding or proceeding before or
by any commission, agency or other administrative or regulatory body or
authority pending or, to the knowledge of ILPCS, threatened, which could
adversely and materially affect ILPCS's ability to undertake its obligations
under this Agreement.

               (ii)  ILPCS owns and operates, and has owned and operated, its
business, and carries on and conducts, and has carried on and conducted, its
business in compliance with all federal, foreign, state and local laws,
statutes, ordinances, rules and regulations.

          (e)  The warranties and representations of ILPCS set out in this
Section 6 shall survive the termination or expiration of this Agreement for a
period of twelve (12) months.

     7.   Purchaser Representations and Warranties.  Purchaser represents and
          ----------------------------------------
warrants to ILPCS as follows:

          (a)  Organization.  Purchaser is a corporation duly formed, validly
               ------------
existing and in good standing under the laws of the State of Delaware.
Purchaser has full legal authority and power to enter into and perform this
Agreement and is qualified to conduct business in the State of Illinois.

          (b)  Authorization; Enforceability.  The execution, delivery and
               -----------------------------
performance of this Agreement and all of the documents and instruments required
hereby of Purchaser, and the consummation by Purchaser of the transactions
contemplated herein, are within the power of Purchaser and have been duly
authorized by all necessary action by Purchaser.  Those persons executing this
Agreement on behalf of Purchaser have the legal capacity to execute and deliver
this Agreement and the other documents and instruments required hereby.  This
Agreement is, and the other documents and instruments required hereby will be,
when executed and delivered by Purchaser the valid and binding obligations of
Purchaser enforceable against it in accordance with their respective terms,
subject only to bankruptcy, insolvency, reorganization, moratoriums or similar
laws

                                       6
<PAGE>

at the time in effect affecting the enforceability or right of creditors
generally and by general equitable principles which may limit the right to
obtain equitable remedies.

          (c)  Absence of Conflicting Laws and Agreements.  The execution,
               ------------------------------------------
delivery or performance of this Agreement or any other transaction contemplated
by this Agreement by Purchaser neither do nor will, after the giving of notice,
or the lapse of time, or otherwise:

               (i)   conflict with, result in a breach of, or constitute a
default under any federal, state or local law, statute, ordinance, rule or
regulation applicable to Purchaser, or any court or administrative order or
process, or any material contract, agreement, arrangement, commitment or plan to
which Purchaser is a party or by which Purchaser or its assets are bound;

               (ii)  require the consent, waiver, approval, permit, license,
clearance or authorization of, or any declaration or filing with, any court or
governmental or public agency; or

               (iii) require the consent of any person under any material
agreement, arrangement or commitment of any nature to which Purchaser is a party
or by which it is bound.

          (d)  No Litigation; Compliance with Laws.
               -----------------------------------

               (i)   There is no decree, judgment, order, investigation,
litigation at law or in equity, arbitration proceeding or proceeding before or
by any commission, agency or other administrative or regulatory body or
authority pending or, to the knowledge of Purchaser, threatened, which could
adversely and materially affect Purchaser's ability to undertake its obligations
under this Agreement.

               (ii)  Purchaser owns and operates, and has owned and operated,
its business, and carries on and conducts, and has carried on and conducted, its
business in compliance with all federal, foreign, state and local laws,
statutes, ordinances, rules and regulations.

          (e)  The warranties and representations of Purchaser set out in this
Section 7 shall survive the termination or expiration of this Agreement for a
period of twelve (12) months.

     8.   Closing.  ILPCS shall notify Purchaser as soon as possible of its
          -------
projected dates when Towers will be completed and the transfer of the Towers and
related Assets to Purchaser ("Closing") can occur.  Closings for the Towers
shall occur for not less than five (5) Towers at one Closing, unless otherwise
agreed by the parties or unless fewer than five (5) Towers remain to be
purchased, and upon fifteen (15) days' written notice of ILPCS' anticipated date
for Closing (the "Closing Date"), and shall be subject to the satisfaction, or
waiver by Purchaser, in its sole discretion, of all the conditions set forth in
on Section 11 hereof.  The Closings of the transaction(s) contemplated by this
Agreement shall occur at the offices of Meyer, Capel, Hirschfeld, Muncy, Jahn &
Aldeen, P.C., 306 West Church Street, Champaign, Illinois 61820, unless
otherwise agreed by the parties in writing in advance of Closing.  At each
Closing ILPCS shall sell, assign, convey, transfer and deliver

                                       7
<PAGE>

to Purchaser, and Purchaser shall purchase all of ILPCS' right, title and
interest, legal and equitable, in and to, the Towers identified in the notice(s)
of Closing and all related Assets, including without limitation the documents
described on Exhibit 5 (the "Closing Documents") and assume, with full release
             ---------
for ILPCS, all of ILPCS's duties under each Ground Lease.

     9.   Closing Costs.  All utility, real estate tax and other expense items
          -------------
applicable to the Assets, or paid or to be paid under any Ground Lease shall be
pro-rated to the Closing Date, other than ILPCS' insurance that is not to be
transferred to Purchaser.  Any security deposits and rents paid or received by
ILPCS with respect to any Tower being conveyed shall be transferred to Purchaser
for cash or other immediately available funds at the Closing.  ILPCS shall pay
all costs of the surveys, and environmental and any other studies ordered by and
for ILPCS as part of ILPCS' site acquisition process.  ILPCS shall pay the
owners' title insurance policy premiums for the policy to be provided to
Purchaser at Closing and any recording costs to record releases required to
convey clear title to Purchaser, and all title search fees shall be paid one-
half by ILPCS and one-half by Purchaser.  Purchaser shall pay all other
recording costs and the cost of any environmental and any other studies or
services it may request.  ILPCS shall pay all applicable taxes on or relating to
the transfer of the Assets other than Purchaser's income taxes.  Purchaser and
ILPCS shall each pay for their own legal expenses.

     10.  Non-assumption of Liabilities.  Except with respect to obligations
          -----------------------------
arising under and by virtue of Ground Leases and the Master Lease as described
in this Agreement or as otherwise provided in this Agreement, Purchaser shall
not assume or become obligated to pay any debt, obligation or liability of any
kind or nature of ILPCS.  The Towers and all related Assets shall be conveyed at
applicable Closings free and clear of financial, mechanics' and any other liens
not expressly accepted or assumed in writing by Purchaser.  All liabilities of
ILPCS which are not expressly assumed hereunder or in a separate writing
executed by Purchaser shall be discharged by ILPCS prior to or as a part of the
Closing.

     11.  Conditions to Closings; Closing Deliverables.
          --------------------------------------------

          (a)  Compliance with Agreement.  ILPCS shall have performed and
               -------------------------
complied in all material respects with all of its obligations under this
Agreement which are to be performed or complied with by ILCPS prior to or at the
Closing.

          (b)  Proceedings and Instruments Satisfactory.  All Closing Documents
               ----------------------------------------
shall be complete to the reasonable satisfaction of Purchaser and Purchaser's
counsel and ILPCS shall have made available to Purchaser for examination the
originals or true and correct copies of all documents related to each such Tower
which Purchaser may reasonable request (excluding financial information) in
connection with the transactions contemplated by this Agreement.

          (c)  Representations and Warranties.  The representations and
               ------------------------------
warranties made by each party in this Agreement shall be true and correct, and
where they are based upon knowledge the truth of the underlying representation
or warranty to which such knowledge pertains shall be true

                                       8
<PAGE>

and correct, in all material respects as of the Closing Date with the same force
and effect as though such representations and warranties had been made on the
Closing Date, except for changes permitted or contemplated by this Agreement.

          (d)  No Material Adverse Change.  Between the date of this Agreement
               --------------------------
and the Closing, there shall have been material adverse change in the condition
or legal status of the Assets to be conveyed.

          (e)  Deliveries at Closing.  Purchaser shall have delivered at Closing
               ---------------------
the Purchase Price provided for in this Agreement.  ILPCS shall have delivered
or caused to be delivered to Purchaser Closing Documents, each properly executed
and dated as of the Closing Date in form and substance satisfactory to
Purchaser.  Purchaser and ILPCS shall execute an appropriately completed copy of
the Lease Agreement set out as attached Exhibit 6 incorporated herein by this
                                        ---------
reference.  The parties acknowledge that the Lease Agreement set out as Exhibit
6 shows American Tower, L.P., a property holding affiliate of Purchaser ("ATLP")
as Lessor, and agree that although ATLP is not a party to this Agreement it
shall be permitted to be the Lessor thereunder.  Purchaser hereby
unconditionally guarantees full performance by ATLP of all of the duties and
obligations of ATLP under each such Lease Agreement that ATLP may enter.
Purchaser's guarantee of all of the duties and obligations of ATLP as set out in
this Section, and all of ILPCS' rights and remedies upon default by Purchaser
and ILPCS' rights of indemnification under this Agreement, shall survive the
termination or expiration of this Agreement without limitation and shall
continue to be available to ILPCS until all of the obligations of ATLP shall
have been fulfilled under the last to expire or terminate of such Lease
Agreements and any claims on such guarantee have been fully resolved.

          (f)  Required Approvals and Consent.  Each party shall have secured
               ------------------------------
such permissions, approvals, determinations, consents and waivers, if any, as
may be required of it by law, regulatory authorities, and the Ground Leases.
Transfers to Purchaser of any FAA, FCC or other federal, state or local licenses
or permits shall be the responsibility of Purchaser, and failure of Purchaser to
obtain any one or more thereof shall be a default by Purchaser.

          (g)  Absence of Investigations, Proceedings and Liens.  There shall be
               ------------------------------------------------
no decree, judgment, order, or litigation at law or in equity, no arbitration
proceedings, no action or proceeding before or by any commission, agency or
other administrative or regulatory body or authority pending to which ILPCS is a
party or to which any of the Assets are subject, including any with respect to
condemnation, zoning, use or occupancy, which would materially adversely affect
the ability of Purchaser to use any of the Assets in connection with the
operation of the Towers, and no liens on the Assets being conveyed (other than
nonmonetary liens accepted by Purchaser in its review of title to the Assets).

     12.  Covenants.
          ---------

          (a)  Cooperation.  Purchaser will cooperate with ILPCS, at Purchaser's
               -----------
expense, in connection with securing any non-governmental approvals, consents
and waivers of third parties

                                       9
<PAGE>

and giving notices to any governmental authority or securing the permission or
approval, determination, consent or waiver of any governmental authority,
required by law in connection with the transactions contemplated hereunder.

          (b)  Notification.  ILPCS shall promptly notify Purchaser of any
               ------------
material adverse development with respect to any of the Assets.

          (c)  No Leasing Pending Closing.  If ILPCS identifies any prospective
               --------------------------
customer(s) for such Towers (collectively, "New Tenants"), between the Effective
Date and the Closing for any Tower(s), and provided Purchaser is not in default
under this Agreement, ILPCS shall refer such prospect to Purchaser.  ILPCS shall
enter into no leases or licenses with New Tenants for any Tower without
Purchaser's written approval, not to be unreasonably withheld or delayed.
Provided Purchaser is not in default under this Agreement, Purchaser shall be
allowed to market the future sites and negotiate licenses with prospective
tenants pending completion of the sites.  ILPCS shall cooperate in Purchaser's
efforts in this regard and cause its contractors to also cooperate.

     13.  Environmental Compliance and Indemnification.  (a)  ILPCS shall comply
          --------------------------------------------
with, and the Towers and the Improvements thereon shall be in material
compliance with, all federal, state and local environmental laws including, but
not limited to, the rules and regulations of the Environmental Protection
Agency, the Federal Solid Waste Disposal Act, the Federal Clean Air Act, and the
Federal Resource Conservation and Recovery Act of 1976 and the Federal
Comprehensive Environmental Response, Compensation and Liability Act of 1980
(collectively "Environmental Laws").  Wastes, substances, or materials that are
deemed hazardous, toxic, pollutants or contaminants, including without
limitation, substances defined as "hazardous wastes," "hazardous substances,"
"toxic substances" or other similar designations in or otherwise subject to
regulation under any Environmental Laws shall herein collectively be termed
"Hazardous Materials."

          (b)  ILPCS is not subject to any judgment, order or citation related
to or arising out of any Environmental Laws and ILPCS has not been named or
listed as a potentially responsible party by any governmental body or agency in
any matter arising with respect to the Towers and the Improvements thereon
related to or arising out of any Environmental Laws.

          (c)  ILPCS shall, upon request, provide Purchaser with a copy of any
environmental phase I report ILPCS has had prepared with respect to the Real
Property on which any Tower is constructed, however ILPCS does not warrant the
content thereof or that Purchaser would have any right of recourse against the
preparer thereof in the event it is incorrect in any way.

          (d)  ILPCS shall indemnify and hold Purchaser, Purchaser's officers
and employees (collectively, "Purchaser Indemnified Parties") harmless from and
against, and agree promptly to defend Purchaser from and reimburse Purchaser
Indemnified Parties for, any and all losses, damages, costs, expenses,
liabilities, obligations and claims of any kind (including, without limitation,
reasonable attorney fees and other legal costs and expenses) ("Environmental
Losses") which Purchaser Indemnified Parties may at any time incur, or become
subject to, in connection with (i)

                                       10
<PAGE>

any breach or inaccuracy of any of the representations, warranties or covenants
made by ILPCS in this Section 13, or in any instrument, certificate or other
document delivered by ILPCS to Purchaser in connection with the provisions of
this Section 13; and (ii) any failure by ILPCS to carry out, perform, satisfy
and discharge any of their covenants, agreements, undertakings, liabilities or
obligations under this Section 13; and (iii) the presence or removal of
Hazardous Materials on or from the Towers and the Improvements thereon,
including cleanup costs and other compliance with Environmental Laws, whether
before or, to the extent relating to any remediation efforts that may have been
undertaken prior to Closing, after the Closing; or (iv) any suit, action or
other proceeding brought by any governmental authority or person in any way
related to any of the foregoing matters.

          (e)  The representations, warranties, covenants and duty to indemnify
set forth in this Section 13 shall survive for a period of twelve (12) months
from the Closing Date for each Tower.

     14.  Indemnification by ILPCS.  ILPCS shall indemnify and hold Purchaser,
          ------------------------
Purchaser's officers and employees (collectively, "Purchaser Indemnified
Parties") harmless from and against, and agree promptly to defend Purchaser from
and reimburse Purchaser Indemnified Parties for, any direct losses, damages,
costs, expenses, liabilities, obligations and claims of any kind (including,
without limitation, reasonable attorney fees and other legal costs and expenses,
but excluding any indirect or consequential damages) ("Losses") which Purchaser
Indemnified Parties may incur, or become subject to, in connection with:

          (a)  any breach of any of the representations and warranties made by
ILPCS in or pursuant to this Agreement;

          (b)  any failure by ILPCS to carry out, perform, satisfy and discharge
any of its covenants, agreements, undertakings, liabilities or obligations under
this Agreement or under any of the Closing Documents delivered by ILPCS pursuant
to this Agreement; and

          (c)  any suit, action or other proceeding brought by any governmental
authority or person as a direct result of the foregoing matters.

          The duty of ILPCS to indemnify set forth in this Section 14 shall
survive for a period of twelve (12) months from the termination or the
expiration of the term of this Agreement.

     15.  Indemnification by Purchaser.  Purchaser shall indemnify and hold
          ----------------------------
ILPCS and ILPCS' officers, employees and members (collectively, "ILPCS
Indemnified Parties") harmless from and against, and agrees to promptly defend
ILPCS Indemnified Parties from and reimburse ILPCS Indemnified Parties for, any
and all Losses which ILPCS Indemnified Parties may at any time suffer or incur,
or become subject to, as a result of or in connection with:

                                       11
<PAGE>

          (a)  any breach of any representations and warranties made by
Purchaser in or pursuant to this Agreement, or in any certificate or affidavit
delivered by Purchaser to ILPCS in accordance with the provisions of any Section
hereof;

          (b)  any failure by Purchaser to carry out, perform, satisfy and
discharge any of its covenants, agreements, undertakings, liabilities or
obligations under this Agreement or under any of the documents and materials
delivered by Purchaser pursuant to this Agreement; and

          (c)  any suit, action or other proceeding brought by an governmental
authority or person as a direct result of the foregoing matters.

          The duty of Purchaser to indemnify set forth in this Section 15 shall
survive for a period of twelve (12) months from the termination or the
expiration of the term of this Agreement.

     16.  Default and Remedies.  In the event either party shall fail to fully
          --------------------
and timely comply with any of the terms or conditions of this Agreement, and
shall fail to remedy such breach within thirty (30) days after written notice
thereof, or five (5) days with respect to any obligation to make any payment
called for in this Agreement, the other party shall have the right to equitable
remedies and remedies at law, and shall be entitled to recover any damages
incurred as a result of such breach and, in addition to any other remedies
available to it hereunder, to recover all costs, including reasonable attorneys'
fees, incurred in enforcing this Agreement.

     17.  Miscellaneous.
          -------------

          (a)  Entire Agreement; Amendment; and Waivers.  This Agreement and the
               ----------------------------------------
documents required to be delivered pursuant hereto constitute the entire
agreement between the parties pertaining to the subject matter hereof, and
supersede all prior and contemporaneous agreements, understandings, negotiations
and discussions of the parties, whether oral or written, and there are no
warranties, representations or other agreements between the parties in
connection with the subject matter hereof, except as specifically set forth
herein.  No amendment, supplement, modification, waiver or termination of this
Agreement shall be binding unless executed in writing by the party to be bound
thereby and approved in writing by the Lender, as defined in Section 17(b)
below.  No waiver of any of the provisions of this Agreement shall be deemed or
shall constitute a waiver of any other provision of this Agreement, whether or
not similar, unless otherwise expressly provided.

          (b)  Benefit; Assignment.  This Agreement shall be binding upon and
               -------------------
inure to the benefit of and shall be enforceable by Purchaser and ILPCS, and any
permitted successors and assigns as provided herein.  This Agreement (and any
rights, obligations or liabilities hereunder) may not be assigned, transferred
or delegated in whole or in part by either party without the prior written
consent of the other party, its successors and assigns, in their sole
discretion; provided, however, that notwithstanding any provision of this
Agreement to the contrary, ILPCS shall be permitted to pledge, hypothecate or
otherwise grant a lien, security interest or collateral assignment (whether
pursuant

                                       12
<PAGE>

to a security agreement, collateral assignment or other instrument) (a "Lien")
in and to all right, title and interest of ILPCS in and to this Agreement, to
Nortel Networks Inc. (individually and/or as administrative agent for itself and
other lenders) and its successors and assigns or any refinancing or replacement
lender (hereinafter collectively called "Lender") in connection with certain
debt financing to ILPCS or to any of its affiliates as security for such debt
financing. Lender shall be permitted to foreclose upon any such Lien (or accept
an assignment in lieu of foreclosure) and transfer and assign all right, title
and interest of ILPCS in and to this Agreement pursuant to or subsequent to such
foreclosure and, in the event of any such foreclosure, transfer or assignment,
and provided Lender or its successor-in-interest expressly assumes in writing
and agrees to perform each of ILPCS' covenants, duties and obligations which
will arise and accrue from and after the date of such foreclosure, transfer or
assignment, Purchaser agrees that it will recognize Lender or its successor-in-
interest as the successor-in-interest to ILPCS under this Agreement as if Lender
or its successor-in-interest (as applicable) were ILPCS under this Agreement.
Notwithstanding the provisions of Section 5 of this Agreement to the contrary,
ILPCS and such Lender shall also be entitled to share information with regard to
this Agreement and Purchaser as Lender determines reasonably required.

          (c)  Notices.  All notices, demands, requests, consents, approvals or
               -------
other instruments required or permitted to be given pursuant hereto shall be in
writing and shall be deemed to have been given and received upon (i) receipt, if
hand delivered, (ii) the next business day, if delivered by a nationally
recognized express delivery service or overnight courier service, or (iii) the
third business day following the day of deposit of such notice in registered or
certified mail, return receipt requested.  Telecopy numbers are provided below
for informational purposes only, and not to be used for notices required by this
Agreement.  Notices shall be provided to the addresses specified below:

     If to Purchaser:    American Tower Corporation
                         1101 Perimeter Drive, Suite 225
                         Schaumburg, IL 60173
                         Attn: John J. Peterman, Vice President
                         Telecopy No.: (847) 240-1522

     With a copy to:     Michael B. Milsom, Vice President and General Counsel
                         American Tower Corporation
                         116 Huntington Avenue
                         Boston, MA 02116
                         Telecopy No.: (617) 375-7575

     If to ILPCS:        Illinois PCS, LLC
                         11 Hawkeye Lane
                         Geneseo, IL 61254
                         Attn: M. Lynn Pike, Vice President & C.O.O.
                         Telecopy No.: (309) 945-1785

                                       13
<PAGE>

     With a copy to:     Meyer, Capel, Hirschfeld, Jahn & Aldeen, P.C.
                         306 W. Church Street
                         P.O. Box 6750
                         Champaign, IL 61826-6750
                         Attn: Tracy Nugent
                         Telecopy No.: (217) 352-1083

     If to Nortel:       Nortel Networks Inc.
                         GMS 991 15 A40
                         2221 Lakeside Blvd.
                         Richardson, Texas 75082-4399
                         Attn: Vice President - Finance
                         Wireless Networks
                         Telecopy No.: (972) 684-3929

     With a copy to:     Jenkens & Gilchrist
                         1445 Ross Avenue
                         Suite 3200
                         Dallas, Texas 75202
                         Attn: Ronald D. Rosener
                         Telecopy No.: (214) 855-4300

          Each person and entity listed above may at any time change its address
for such notices by delivering to the other, as aforesaid, a notice of such
change.

          (d)  Severability.  If any provision, clause or part of this Agreement
               ------------
or the application thereof under certain circumstances is held invalid, or
unenforceable by a court of competent jurisdiction, the remainder of this
Agreement, or the application of such provision, clause or part under other
circumstances, shall not be affected thereby; provided, however, that if any
provision that is held to be invalid or unenforceable entails a financial
benefit to or burden upon a party, then the parties hereby agree that other
provisions of this Agreement that are not held to be invalid or unenforceable
shall be revised in order to achieve substantially the same overall financial
benefits and burdens on the parties as intended under all the provisions of this
Agreement as executed and that, upon the failure of the parties to agree to a
revision in accordance with this Section, either party may petition a court of
competent jurisdiction to determine the appropriate revision(s) pursuant to this
Section.

          (e)  Governing Law, Venue and Jurisdiction.  This Agreement shall be
               -------------------------------------
construed and interpreted according to the laws of the State of Illinois,
without regard to the conflict of law principles thereof.  The parties agree
that all actions or proceedings in any way arising out of, from or related to
this agreement shall be litigated in courts having situs within the County of
Champaign, State of Illinois.  The parties hereby consent and submit to the
jurisdiction of the state or federal

                                       14
<PAGE>

court located with said city and state, and hereby waive any right either may
have to transfer or change the venue of any such litigation.

          (f)  Effective Date. The Effective Date of this Agreement shall be the
               --------------
date on which this Agreement is last executed by the parties as set out below
their respective signatures.

          (g)  Rights of First Refusal.  With respect to any towers that ILPCS
               -----------------------
presently owns or hereafter constructs that are less than 150' in height (each
being called herein a "Short Tower"), Purchaser is hereby granted a right of
first refusal, as follows, that may be exercised only during the term of this
Agreement and only while Purchaser is not in default.  Before ILPCS makes or
solicits any offer to sell any Short Tower it shall first notify Purchaser of
the price at which it desires to sell, and if Purchaser notifies ILPCS of its
interest in purchasing such Tower within one (1) week of Purchaser's receipt of
such notice ILPCS shall negotiate only with Purchaser regarding the sale of the
Short Tower for a period of not more than thirty (30) days after Purchaser's
receipt of ILPCS's notice.  If no binding contract results within said time
period, then ILPCS shall be free to sell such Short Tower to any third party at
a price no less favorable to the purchaser than the price last offered to
Purchaser.  If ILPCS subsequently decides that it is willing to accept a less
favorable price from any other purchaser, then it shall allow Purchaser the
opportunity for a period of seven (7) days from the date of ILPCS' notice of
this fact to negotiate to purchase such Short Tower at the revised price, but if
ILPCS and Purchaser shall not agree to a sale within this period, ILPCS shall
thereafter have no further obligation to negotiate with Purchaser with regard to
such Short Tower.

          (h)  No Joint Enterprise.  Except as expressly provided in this
               -------------------
Agreement, Purchaser shall not assume ore become obligated to pay any debt,
obligation or liability of any kind or nature of ILPCS.  ILPCS and Purchaser
hereby acknowledge and agree that each is an independent contractor with respect
to the other, and therefore neither will represent to anyone that its
relationship with respect to the other party or to any Tower or prospective
Tower is other than as an independent contractor, or that it has any actual or
apparent authority to bind the other party.

     IN WITNESS WHEREOF, the parties have executed this Agreement as of the day
and year first above written.

"Purchaser":                            "ILPCS":

AMERICAN TOWER CORPORATION,             ILLINOIS PCS, LLC,
a Delaware corporation                  an Illinois limited liability company

By: /s/ John Sonny Peterman             By: /s/ Timothy M. Yager
   -----------------------------           -------------------------------------
    Name: John Sonny Peterman               Name: Timothy M. Yager
         ------------------------                -------------------------------
    Title: VP/GM Midwest Region             Title: CEO/President/General Manager
          -----------------------                 ------------------------------
Date: May 28, 1999                      Date: May 28, 1999
     ----------------------------            -----------------------------------

                                       15

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00016-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00016-of-00352.parquet"}]]