Document:

CONFIDENTIAL TREATMENT REQUESTED

     Confidential Portions of This Agreement Which Have been Redacted are Marked
with Brackets ("[***]"). The Omitted Material has been Filed Separately with The
Securities and Exchange Commission.

                          MASTER DESIGN BUILD AGREEMENT

     THIS MASTER DESIGN BUILD AGREEMENT ("Agreement"),  dated as of the ____ day
of  ____________,  1999  ("Effective  Date"),  is  made by and  between  Horizon
Personal  Communications,  Inc.  ("Horizon")  and SBA  Towers,  Inc.,  a Florida
corporation ("BTS Company").

     WHEREAS,  Horizon Telecom, Inc., Horizon and SBA have entered into an Asset
Purchase Agreement ("APA") whereby SBA will purchase certain  telecommunications
tower sites from  Horizon,  and Horizon and SBA have entered into or have agreed
to enter into a Master Site Agreement ("MSX"), and a Site Development  Agreement
("Site Development Agreement"); and

     WHEREAS,    Horizon   is   in   the   business   of   providing    wireless
telecommunications services; and

     WHEREAS,  BTS Company is in the  business of  erecting,  owning and leasing
tower facilities for equipment used in providing such services; and

     WHEREAS,  Horizon  desires  to use  BTS  Company's  services  to  identify,
evaluate, and acquire sites for such tower facilities; and

     WHEREAS,  BTS  Company  desires  to  construct  a  network  of  such  tower
facilities  within Horizon's service areas in a manner that will coordinate with
Horizon's needs for tower facilities; and

     WHEREAS,  the parties  desire that in most cases a site  identified  by the
procedures set forth herein will result in a tower  facility  constructed by BTS
Company  and  leased  to  Horizon  for the  installation  and  operation  of its
equipment; and

     WHEREAS,  this  Agreement  sets  forth  the  manner in which  Horizon  will
identify the general  location of potential sites, BTS Company will evaluate and
make  recommendations  as to specific  sites and Horizon will lease space on any
such site for the installation  and operation of its equipment  pursuant to this
Agreement.

     NOW,  THEREFORE,  for and in consideration of the mutual promises set forth
herein, the parties hereto agree as follows:

                           1. RELATIONSHIP OF PARTIES

     1.1 INDEPENDENT CONTRACTOR RELATIONSHIP. The parties intend by this
Agreement to establish an independent contractor relationship. Neither party nor
their employees shall be agents or legal  representatives of the other party for
any purpose.  Neither party shall have the authority to act for, bind, or commit

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the other  party.  BTS Company and Horizon  agree that this  Agreement  does not
establish or create a relationship of employer-employee,  principal-agent,  or a
franchise, joint venture, or partnership for any purpose whatsoever.

     1.2 CONTRACTS WITH AFFILIATES.  BTS Company may contract with any Affiliate
(as  hereinafter  defined)  of BTS Company to provide  goods or services  beyond
those which its employees would perform, if it deems the same to be necessary or
advisable for development and/or construction of the Sites.

     1.3 LANDLORD AND TENANT RELATIONSHIP. BTS Company and Horizon shall execute
contemporaneously  with the execution of this  Agreement,  the MSA which governs
the relationship of BTS Company,  as landlord,  and Horizon, as tenant, on those
BTS Sites  which are  accepted  by Horizon  pursuant  to Section  2.7(b) of this
Agreement. A copy of the MSA is attached hereto as Exhibit "A."

     1.4  EXCLUSIVITY.  During the term of this Agreement,  BTS Company shall be
the exclusive  build-to-suit,  site acquisition,  line and antenna installation,
and construction company for wireless telecommunications tower sites for Horizon
and its  Affiliates  in Region 1 and Region 2 (as those terms are defined in the
MSA  and  the  Site  Development  Agreement  which  is  executed  simultaneously
herewith).  For purposes of this Agreement,  "Affiliates" with respect to either
party,  shall mean companies  which control,  are controlled by, or under common
control with that party.  For  purposes of this  Agreement,  the word  "control"
shall mean the  ownership,  directly  or  indirectly,  of the power to direct or
cause the direction of the management and policies of an entity, or the power to
veto major policy decisions of any such entity, whether through the ownership of
voting securities,  by contract or otherwise.  During the term of this Agreement
Horizon shall not engage any third party or Affiliate  directly or indirectly to
perform build-to-suit site acquisition,  construction, or equipment installation
services  described in this  Agreement  and will not enter into any  discussions
with any  third  party or  Affiliate  concerning,  or  furnish  any  information
relating to such  services to any third party or  Affiliate,  for the purpose of
considering,   soliciting   or   inducing   any  offer  by  such  third   party.
Notwithstanding the foregoing,  in the event that Horizon and BTS Company do not
agree upon the  payment  amount for a CMS Site,  Horizon  shall be  entitled  to
utilize  a  different  contractor  or  subcontractor  or its own  personnel  for
construction  services.  In the event that Horizon elects to utilize a different
contractor or subcontractor  as provided  herein,  Horizon shall first offer BTS
Company the right to perform such  services on the same terms and  conditions as
offered by the contractor or subcontractor.

                         II. SITE ACQUISITION SERVICES.

     2.1 SITE ACQUISITION SERVICES.

          (a) Horizon shall establish small geographic areas within which a cell
site or  transmission  tower  shall be located,  based on the network  grid's RF
design (a "Search  Ring").  For each  Search  Ring,  Horizon  shall  provide (i)
minimum tower specifications,  (ii) desired mounting height, (iii) a description
of the equipment that Horizon intends to put on the tower, and

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(iv) any other  technical data  necessary to permit SBA to effectively  identify
the  candidate  sites that meet  Horizon's  needs.  Horizon  will provide to BTS
Company its System  network grid,  with the  established  Search Rings  overlaid
thereon.  Horizon will,  from time to time,  assign Search Rings to BTS Company.
BTS Company shall provide the  personnel and  facilities  which are necessary to
locate and lease or license  existing  towers,  buildings or other structures by
Horizon to be used for the construction and installation of Horizon's  equipment
("Collocation  Sites") or unimproved real property suitable for the construction
and installation of a communications  tower ("Tower") and related  facilities by
BTS  Company  ("BTS  Site").  As  used  herein,  "Sites"  shall  refer  to  both
Collocation  Sites  and BTS  Sites,  where  appropriate.  The  Site  Acquisition
Services  are more  particularly  described  in and  shall be  performed  by BTS
Company in  accordance  with the scope of work  attached  hereto as Schedule "A"
which is incorporated by referenced herein ("Site  Acquisition  Services").  BTS
Company shall be entitled to compensation  from Horizon for the Site Acquisition
Services as set forth on Schedule "C".

          (b) Upon its receipt of a Search Ring designated hereunder by Horizon,
BTS Company  shall  promptly,  diligently  and  professionally  perform the Site
Acquisition Services with respect to such Search Ring. BTS Company shall perform
the Site  Acquisition  Services in accordance  with this  Agreement,  including,
without  limitation,  the  objectives  and  procedures set forth in Schedule "A"
("Objectives  and  Procedures").  Provided  that  Horizon  does  not  materially
increase BTS Company's duties or impair BTS Company's rights hereunder,  Horizon
shall have the right  from time to time upon  written  notice to BTS  Company to
adjust,  modify or supplement  the  Objectives  and  Procedures  and the form of
documents to be generated or provided by BTS Company pursuant thereto.

          (c) Except as  expressly  authorized  in this  Agreement  or otherwise
expressly authorized by Horizon in writing, BTS Company shall provide all labor,
equipment,  material  and  supplies  necessary  or  appropriate  to perform Site
Acquisition  Services.  In the event that BTS Company elects to subcontract  any
Site  Acquisition  Services,  BTS Company shall obtain  Horizon's  prior written
consent to utilize such subcontractors,  which consent shall not be unreasonably
conditioned, delayed or withheld.

          (d) During the performance of Site  Acquisition  Services with respect
to any designated Search Ring, BTS Company shall at all times apprise Horizon of
any expressed opposition,  protest,  litigation or other efforts,  whether by an
individual,  group, neighborhood association or other organization, to restrict,
alter or prohibit the construction,  installation or operation of any structure,
structures or other facilities that Horizon or BTS Company proposes to construct
or operate on any Site within such Search Ring.

     2.2  WITHDRAWAL  OF  SITE.  In the  event  Horizon  elects  to  withdraw  a
Collocation  Site at any  time  or a BTS  Site  pursuant  to the  terms  of this
Agreement Horizon shall give BTS Company notice of such withdrawal and shall pay
BTS Company  [***] of the  milestone  installment  that would be due if the work
currently in progress was completed,  [***] of the reimbursable costs which were
incurred prior to the date on which BTS Company receives notice of the withdrawn
Site,  and [***] of all other amounts due  hereunder  for work  completed on the
Site as of the  date  BTS  Company  receives  Horizon's  withdrawal  notice  and
substitute the withdrawn  Site with an  alternative  site within sixty (60) days

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                                        [***] - CONFIDENTIAL TREATMENT REQUESTED

("Alternative Site"), if available.  In the event that a withdrawn Site is a BTS
Site, Horizon shall pay BTS Company for Site Acquisition  Services in connection
with such Site as set forth in Schedule "C" attached hereto.

     2.3 SEARCH RINGS  DESIGN.  Horizon  shall have the right at any time in its
sole and absolute  discretion to expand or  reconfigure a previously  designated
Search Ring. In the event that Horizon  redesigns a search ring beyond 0.5 miles
of an urban or suburban  Site or 1.5 miles of a rural Site for which BTS Company
has begun but not yet  completed  all Site  Acquisition  Services,  then Horizon
shall pay BTS Company [***] for all Site Acquisition  Services  completed at the
time that the  notice of  redesign  is  received  by BTS  Company,  [***] of the
reimbursable  costs which were  incurred  prior to the date on which BTS Company
receives  notice of such  reconfigured  Search Ring,  and [***] of the milestone
installment  that would be due if the work  currently in progress was completed.
In the event that such Site was a BTS Site,  Horizon  shall pay BTS  Company for
such Site  Acquisition  Services  as set  forth on  Schedule  "C".  For all Site
Acquisition  Services rendered for the redesigned search ring, in the event that
the Site in the redesigned Search Ring is not a BTS Site,  Horizon shall pay BTS
Company an additional [***] of the milestone  installments due for all milestone
installments  to be  performed  and [***] of all  milestone  installments  to be
performed  for the first  time and  [***] of the  reimbursable  costs  which are
incurred.  Horizon  agrees not to develop  any site  within  any  redesigned  or
withdrawn  Search  Rings as a tower site and further  agrees not to transfer the
associated Work Product to any third party, including Affiliates.

     2.4 TERM OF SITE ACQUISITION SERVICES AGREEMENT. The term of this Agreement
(the "Site  Acquisition  Term") shall commence on the date of this Agreement and
shall expire on December 31, 2001.

          (a) This Agreement may be terminated as to any particular  Search Ring
upon written  notice by either party  following the other  party's  breach of an
obligation or covenant on such party's part to be performed with respect to that
Search  Ring,  which  breach  is not cured  within  thirty  (30) days  after the
breaching party's receipt of written notice; provided,  however, that so long as
the defaulting  party commenced  appropriate  curative action within such thirty
(30) day period, and thereafter diligently prosecutes such cure to completion as
promptly  as  possible,  the cure  period  will be  extended  until  the cure is
completed. If a party fails to cure a breach within this thirty (30) day period,
as it may be extended,  the party will be in default under this  Agreement as it
applies to the applicable Search Ring; and

          (b) Neither a termination  nor the expiration of this Agreement  shall
affect:

               (i) the  term  of the MSA or any  SLA,  as that  term is  defined
herein,  which  has  been  entered  into by the  parties  prior  to the  date of
termination of this Agreement, which shall continue in accordance with its terms
and conditions;

               (ii) the terms of this  Agreement that apply to any SLA which has
been  entered  into by the  parties  prior  to the date of  termination  of this
Agreement;

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                                        [***] - CONFIDENTIAL TREATMENT REQUESTED

               (iii) any duties or obligations  for payment or performance  that
are or become owing hereunder prior to the effective date of such termination;

               (iv) the terms of this  Agreement  that apply to any Search  Ring
which was issued prior to the date of termination of this Agreement; or

               (v) any other duties or obligations  that  expressly  survive the
termination or expiration hereof.

          (c) A default regarding one Search Ring shall not constitute a default
under this Agreement;  however, a default under the greater of: (1) [***] Search
Rings;  or (2) [***] or more of the Search Rings which have been issued pursuant
to this  Agreement,  shall  constitute  a default  under every Search Ring and a
default under this Agreement.  In the event of such a default,  Horizon shall be
entitled to terminate the services of BTS Company and complete or engage a third
party to complete BTS Company's  responsibilities  under this Agreement pursuant
to the  Plans  and  Specifications  (as  hereinafter  defined)  provided  by BTS
Company.  In  such  event,   Horizon  shall  convey  the  Tower  Facilities  (as
hereinafter defined) and any site development  materials including ground leases
and  title,   environmental  and  geotechnical   reports  to  BTS  Company  upon
completion,  lien  free,  and  BTS  Company  shall  reimburse  Horizon  for  the
reasonable  costs  of  completing  its  responsibilities  and  pay  Horizon  the
applicable site development fee set forth in the Site Development  Agreement (as
hereinafter defined).

     2.5 GROUND LEASES.  The acquisition of BTS Sites by BTS Company pursuant to
this Agreement  shall be accomplished  using a lease agreement in  substantially
the same form as the  Option and Lease  Agreement  which is  attached  hereto as
Exhibit "B" (hereafter the "Ground Lease").  In no event shall BTS Company agree
to material  modifications  to the  provisions  set forth in paragraph 35 of the
Ground Lease  without  Horizon's  prior written  approval.  The  acquisition  of
Collocation   Sites  by  BTS  Company   pursuant  to  this  Agreement  shall  be
accomplished  using a lease agreement which Horizon shall provide to BTS Company
or on such other form which Horizon may, in its sole discretion, approve.

     2.6. ACCEPTANCE AND REJECTION OF COLLOCATION SITES. Horizon may at any time
in its sole and absolute  discretion  accept or reject any proposed  Collocation
Site. Without limiting the foregoing,  Horizon may withdraw its prior acceptance
of a Collocation Site and thereby reject such Collocation  Site. A withdrawal or
a rejection by Horizon of a Collocation Site shall not affect its obligation for
fees earned through the date of  termination  for Site  Acquisition  Services as
more particularly described in Section 2.2.

     2.7 ACCEPTANCE AND REJECTION OF BTS SITES; EXECUTION AND DELIVERY OF SLAS.

          (a) A BTS Site  shall be  deemed to be an  accepted  BTS Site from and
after the date that the  Candidate  Site which  corresponds  to the BTS Site has
been  approved  by  Horizon  pursuant  to Section  2(a) of  Schedule A and shall
continue to be deemed an accepted BTS Site unless and until Horizon  rejects the
BTS Site pursuant to section 2.7(b) hereof.

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          (b)  Horizon  may at any time  prior  to the  parties'  execution  and
delivery of an SLA  corresponding  thereto,  and in Horizon's  sole and absolute
discretion,  reject any BTS Site.  In the case of a BIS Site that is accepted by
Horizon, the following shall apply:

               (i)  BTS  Company  shall  continue  the  diligent,  thorough  and
professional  prosecution of Site Acquisition Services (including the completion
of Ground  Lease  negotiations  and  required  zoning,  land use and  permitting
matters)  necessary for the construction of a  communications  tower and related
facilities consistent with the criteria theretofore identified by Horizon;

               (ii)  Subject to  Section  2.7(b)(iii)  below,  BTS  Company  and
Horizon shall prepare and finalize the SLA (and exhibits thereto)  applicable to
such BTS Site;

               (iii) Within thirty (30) days following BTS Company's  receipt of
all  necessary  zoning or other land use permits or approvals  applicable to the
improvements to be constructed by BTS Company on the BTS Site and the completion
of Site  Acquisition  Services in accordance with the Objectives and Procedures,
but subject to Section  2.7(b)(iv) below,  Horizon and BTS Company shall execute
and deliver the SLA applicable  thereto.  Unless Horizon  rejects the applicable
BTS Site  within  thirty  (30)  days  following  notice  by BTS  Company  of BTS
Company's receipt of all necessary zoning or other land use permits or approvals
applicable to the landlord  improvements to be constructed by BTS Company on the
BTS Site and BTS Company's completion of Site Acquisition Services in accordance
with the  Objectives  and  Procedures,  BTS  Company  shall  be  unconditionally
obligated  to enter  into the SLA  with  respect  thereto  upon  receipt  of the
foregoing  permits and approvals,  and shall thereafter  perform its obligations
thereunder in accordance  with the SLA and this Agreement.  Notwithstanding  any
provision of this Agreement to the contrary,  in the event that Horizon  neither
accepts  nor rejects the BTS Site  within  thirty days as provided  herein,  BTS
Company may, at BTS Company's  sole option either (1) deem the BTS Site approved
(in which event BTS Company shall be entitled to compel Horizon to execute a SLA
with  respect  to the BTS Site) or (2) deem the BTS Site to be  denied  and make
demand on Horizon for payment of the fees earned for Site Acquisition Services.

               (iv) Horizon may in its sole and absolute discretion withdraw its
prior  acceptance of a BTS Site,  and thereby  reject said BTS Site, at any time
prior to the BTS Company parties' execution and delivery of the SLA for such BTS
Site.

          (c) In the event of a rejection by Horizon of a BTS Site,  including a
rejection after a prior acceptance  thereof as described above in Section 2.7(b)
hereof,  Horizon's only obligation for such BTS Site shall be for the payment of
Site Acquisition  Services  incurred prior to such rejection with respect to the
Search Ring  containing  such BTS Site in  accordance  with Section 2.2. In such
event,  Horizon  agrees not to develop the rejected BTS Site as a tower site and
further agrees not to transfer the  associated  Work Product to any third party,
including Affiliates.

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          (d) In the event of a rejection by Horizon of a BTS Site,  BTS Company
may elect to forego the  compensation  set forth in  Section  2.2 and retain the
Work  Product.  In  such  event,  Horizon  shall  have  the  right,  but not the
obligation,  for a period of one (1) year following the  construction of a tower
on such Site to enter into an SLA for such Site  pursuant  to the MSA as if such
Site were constructed as an accepted BTS Site; provided,  however,  that Horizon
shall not be entitled to compensation  for such Site under the Site  Development
Agreement.

          (e) This  Section  2.7 shall not be  deemed to limit or  restrict  any
rights of termination of a SLA as expressly set forth therein.  Horizon's rights
of rejection  with respect to a BTS Site  contained in this Section 2.7 shall be
in addition to, and not in lieu of, any SLA termination rights.

          (f) In the event that BTS Company's due diligence  investigation  of a
BTS Site reveals any defect in such Site which BTS Company  reasonably  believes
would materially adversely affect BTS Company's multi-tenant use or ownership of
such Site,  BTS  Company  shall be  entitled  to reject such Site upon notice to
Horizon.  In such  event,  Horizon  shall  have the right to  designate  another
candidate  site as the  preferred  candidate.  BTS Company  shall bear all costs
associated with Site  Acquisition  Activities and all costs  associated with the
due diligence investigation, zoning, and permitting of such Site.

     2.8 CONTINUED  PERFORMANCE  OF SITE  ACQUISITION  SERVICES  FOLLOWING  SITE
ACCEPTANCE  OR  REJECTION.  Unless  otherwise  notified by Horizon,  BTS Company
shall:

          (a) Following  Horizon's  acceptance of any Site,  continue to perform
Site Acquisition  Services with respect to such accepted Site in accordance with
this Agreement including, without limitation, the Objectives and Procedures; and

          (b) Following  Horizon's  rejection of any Site (including a rejection
after Horizon's prior acceptance thereof),  continue to perform Site Acquisition
Services  with  respect to the  Search  Ring  pertaining  thereto  (including  a
modified  Search Ring as  described  above in Section 2.3 hereof) in  accordance
with the terms and conditions of this Agreement,  including, without limitation,
the Objectives and Procedures.

     2.9 NO CONFLICTING OBLIGATIONS.

          (a) Neither  BT'S  Company  nor any  Affiliate  of BTS  Company  shall
hereafter during the Site Acquisition Term enter into any agreement, contract or
other   arrangement   with  any  Competitor  (For  purposes  of  this  Agreement
"Competitor"  shall mean an entity  whose  business  includes  the  provision of
wireless  telecommunications  services  to the  public)  pursuant  to which  BTS
Company or any  Affiliate  of BTS  Company  agrees to provide to or on behalf of
such  Competitor site  acquisition  services that: (i) may result in the leasing
(or other  acquisition)  of real  property and the  construction  thereon by BTS
Company or such Affiliate of a wireless communications facility designed to meet
such Competitor's specifications and (ii) affect or may affect any real property
located  within a Search Ring.  BTS Company shall provide to Horizon  during the
Site Acquisition Term BTS Company's primary duty of loyalty and  professionalism
in the

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performance within the geographic area of Site Acquisition  Services  hereunder.
BTS Company shall not perform, or undertake to perform,  any services that would
conflict with BTS Company's loyal,  professional and diligent performance of its
duties  hereunder.  The foregoing  provisions  of this Section  2.9(a) shall not
apply if BTS  Company  notifies  Horizon  of a  pre-existing  conflict  upon BTS
Company's receipt of a Search Ring, nor will it apply to a Search Ring after BTS
Company has completed construction of a BTS Site within such Search Ring.

          (b) In the course of performing Site Acquisition Services or otherwise
in conducting its activities under or with respect to this Agreement or any SLA,
BTS Company shall not publish or distribute any materials or documentation using
Horizon's name without Horizon's express prior written  permission  specifically
relating to such use; provided,  however,  that BTS Company shall be entitled to
utilize Horizon's name where reasonably necessary to facilitate zoning and other
governmental approvals.

     2.10  COMPLIANCE  WITH LAWS.  BTS Company  represents  and warrants that it
shall:  (a) comply  with all  federal,  state and local  laws,  regulations  and
ordinances with respect to its performance of the Site Acquisition Services; (b)
file all reports  relating to the Site  Acquisition  Services and required under
applicable law (including,  without limitation, tax returns); (c) pay all filing
fees and federal state and local taxes  applicable to BTS Company's  business as
the same shall become due; and (d) pay all amounts  required under local,  state
and federal workers' compensation,  disability benefit,  unemployment insurance,
and other  employee  benefit laws and  regulations  when due. BTS Company  shall
provide  Horizon with such documents and other  supporting  materials as Horizon
may reasonably request to evidence BTS Company's continuing compliance with this
Section 2. 10.

     2.11  INSURANCE.  BTS Company and  Horizon  shall each  maintain in effect,
without interruption,  on an annual basis, during the term of this Agreement the
following insurance policies:

          (a) Commercial  General Liability (Bodily Injury and Property Damage).
Insurance  coverage  with  endorsement   evidencing   coverage  for  contractual
liability. The limits of this insurance shall not be less than:

               (i) Each Occurrence Limit $1,000,000

               (ii) General Aggregate Limit $2,000,000

          (b)  Comprehensive   Automobile   Liability   insurance  covering  the
ownership,  operation  and  maintenance  of allowed,  non-owed,  and hired motor
vehicles,  in limits not less than  $1,000,000  for bodily  injury and  property
damage per occurrence.

          (c)  Worker's   Compensation   Insurance  with  statutory  limits  and
Employer's  Liability Insurance with limits of not less than $ 1,000,00 for each
accident.

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          (d)  Professional  Liability  (errors and omissions)  insurance of not
less than $1,000,000 for each occurrence,  with endorsement  evidencing coverage
for contractual liability.

          (e) All foregoing  insurance  shall  provide for an effective  date no
later than the Effective Date of this Agreement.  Horizon and BTS Company agrees
to maintain such coverage in effect without  interruption on an annual basis for
so long as  this  Agreement  is in  effect.  Horizon  shall  be  included  as an
additional insured on BTS Company's Commercial General Liability insurance,  and
BTS Company shall be included as an additional  insured on Horizon's  Commercial
General  Liability  insurance.  Horizon  and BTS  Company  agree to obtain  such
insurance from nationally recognized carriers at commercially  reasonable rates.
Horizon's  and BTS Company's  obligations  under this  Agreement,  including its
indemnification  obligations  under  Section  2.12,  will  not  be  affected  by
obtaining or the failure to obtain any insurance  coverage  required  under this
Section 2.11.

          (f)  Horizon  and BTS  Company  shall  each  provide  the  other  with
Certificates  of  Insurance  from its  insurance  agent or broker  or  insurance
company evidencing the above coverage and limits.

          (g) All insurance  policies required to be maintained  hereunder shall
be  issued  by  companies  that  hold a  current  rating  of not less  than "A",
according to Best Key Rating Guide,  unless this requirement is expressly waived
in writing by the other party.

     2.12   INDEMNIFICATION.   The  following   indemnities  shall  survive  the
expiration or termination of this Agreement:

          (a) By Horizon. Horizon shall indemnify and hold harmless BTS Company,
its Affiliates, directors, officers, shareholders, agents, and employees thereof
from and against any fine, penalty,  loss, cost, damage,  injury, claim, expense
(including  reasonable  attorney and other  professional  fees and costs and all
reasonable fees and costs  associated with enforcing this  indemnification),  or
liability  incurred  by BTS Company as the result of any act,  error,  omission,
non-performance  by negligence,  or wrongful act of Horizon arising directly out
of the  performance  of this  Agreement,  including  any  election by Horizon to
pursue certain rights under this Agreement.

          (b) By BTS Company.  BTS Company  shall  indemnify  and hold  harmless
Horizon,  its  Affiliates,   directors,  officers,  shareholders,   agents,  and
employees thereof from and against any fine, penalty, loss, cost damage, injury,
claim,  expense (including  reasonable  attorney and other professional fees and
costs  and  all  reasonable  fees  and  costs  associated  with  enforcing  this
indemnification),  or  liability  incurred  by Horizon as the result of any act,
error, omission,  non-performance by negligence,  or wrongful act of BTS Company
arising  directly  out of the  performance  of  this  Agreement,  including  any
election by BTS Company to pursue certain rights under this Agreement.

          (c) Notwithstanding anything to the contrary contained in this Section
2.12,  the  indemnity  obligations  of either party hereto will not apply to any
injury, loss, damage, liability, penalty or obligation (or any claim in

<PAGE>

respect  of  the  foregoing)   resulting  from  the  negligence  or  intentional
misconduct  of the other  party  hereto or such of such  other  party's  agents,
employees or  contractors.  To the fullest  extent  permitted by law, all claims
against  the other  party for lost  profits or  earnings  or other  indirect  or
consequential  damages otherwise recoverable under applicable law as a result of
the breach of this  Agreement or otherwise  pursuant to the foregoing  indemnity
provisions are hereby waived by the aggrieved party.

     2.13 ASSIGNMENT AND SUBLEASING.  BTS Company may not assign this Agreement,
in  whole  or in  part,  without  Horizon's  prior  written  consent  except  as
collateral in connection with BTS Company's financing. BTS Company may, however,
subject to the terms of the MSA, sublease any particular Site to another entity.
Horizon  may  assign  all or a  portion  of its  rights  hereunder  to:  (a) any
corporation resulting from any merger,  consolidation or other reorganization to
which Horizon is a party; (b) any corporation, partnership, association or other
person to which  Horizon  transfers all or  substantially  all of the assets and
business of Horizon  existing  at such time;  or (c) any  Affiliate  of Horizon;
provided,  however,  that in the event of an  assignment,  Horizon  shall remain
liable  for its  obligations  hereunder.  All the terms and  provisions  of this
Agreement  shall be binding upon and inure to the benefit of and be  enforceable
by the parties hereto and their respective successors and permitted assigns.

   III. CONSTRUCTION, CONSTRUCTION MANAGEMENT AND PROGRAM MANAGEMENT SERVICES

     3.1 CONSTRUCTION AND CONSTRUCTION MANAGEMENT. BTS Company shall perform the
services  set forth on  Schedule  "B"  attached  hereto  (all of which  shall be
hereinafter referred to collectively as the "Construction  Management Services")
for Horizon, for each site chosen within each of the Search Rings assigned.  All
sites for which BTS Company will perform Construction  Management Services shall
hereinafter be referred to as the "CMS Sites."

     3.2 PROGRAM MANAGEMENT SERVICES.  In connection with, and as a tracking and
indexing  mechanism  for its  provision  of Site  Acquisition  and  Construction
Management  Services  pursuant to this  Agreement,  BTS Company  shall  develop,
implement and maintain a deployment  plan which tracks all  activities and costs
associated with the performance of Site  Acquisition  Services and  Construction
Management Services for each Site in accordance with the following procedures:

          (a) BTS  Company  shall  develop  and  implement  a quality  assurance
program,  which  ensures  that all  activities  are  performed  to such  quality
standards as may be established from time to time by Sprint Spectrum, L.P.

          (b) BTS Company shall develop and  implement  comprehensive  reporting
mechanisms so that  detailed  site  progress is tracked on a weekly  basis,  and
complete reports are provided when required by Horizon, not less frequently than
once per week.

          (c) BTS Company  shall develop and  implement a  comprehensive  filing
system  that  ensures  that all  relevant  site  information  is  organized  and
available.  BTS Company shall seek to use electronic  means whenever  available.
BTS Company shall ensure the physical security of the filing system.

                                       10
<PAGE>

          (d) BTS Company  shall manage and  coordinate  interaction  among site
acquisition, construction, management, and the A&E firm.

          (e) BTS Company shall manage and coordinate  interactions  between the
infrastructure  development staff (site acquisition and construction management)
and other  disciplines  involved in the system deployment (e.g., RF engineering,
network engineering, marketing).

                         IV. DESIGN AND CONSTRUCTION OF
                       WIRELESS COMMUNICATIONS FACILITIES

     4.1 APPROVAL OF PLANS AND SPECIFICATIONS.  BTS Company shall be responsible
for constructing the tower platforms,  ice bridges,  towers, fencing,  grounding
systems,  power and telephone  connections to a central demarcation point within
the tower compound,  and a concrete  equipment pad as specified by site diagrams
for Horizon's  equipment and battery  backup ("Tower  Facilities").  BTS Company
shall prepare and deliver to Horizon for its approval three copies of prototype,
standard plans ("Plans") and construction specifications  ("Specifications") for
the  construction of prototype Tower  Facilities.  The Plans and  Specifications
shall be  delivered to Horizon at least  fourteen  (14)  business  days prior to
obtaining the building  permit on a Site.  Within ten (10) days after receipt of
the Plans and  Specifications,  Horizon  shall  either  approve  such  Plans and
Specifications  or deliver to BTS Company detailed written  objections  thereto.
Horizon  shall  approve  the Plans and  Specifications  if they meet the minimum
specifications set forth by Horizon in its Search Ring; provided,  however, that
Horizon  shall not be required to approve  the Plans and  Specifications  if BTS
Company's Plans and Specifications contemplate tower height or loading in excess
of what was  contemplated in Horizon's Search Ring minimum  specifications,  and
such excess would cause a material delay in BTS Company  obtaining  governmental
approvals with respect to the applicable  Site, and such delay would  materially
delay Horizon's anticipated installation date for its Equipment on such Site.

     4.2 CHANGE ORDERS.  Horizon shall have the right to issue reasonable change
orders to BTS Company on any given Site  provided that such changes are tendered
to BTS  Company  in  writing  thirty  (30) days  prior to the  submittal  of the
applicable  building  permit  application  for the  Tower  Facilities  which are
affected by the change order and further provided that Horizon pays the increase
in the cost of construction of the Tower Facilities  attributable to such change
orders.

     4.3 DEFINITION OF CONSTRUCTION  COSTS. As used herein,  Construction  Costs
shall mean those costs which are the  responsibility  of BTS Company  under this
Agreement  and which shall  include the costs of materials and labor used in the
construction  of  the  Tower  Facilities,   payments  made  to  contractors  and
subcontractors  performing  construction  work  in  connection  with  the  Tower
Facilities including but not limited to the cost of materials,  labor,  expenses
associated  with the lease of equipment  used in  construction,  the cost of any

                                       11
<PAGE>

tower  lighting  system,  the cost of all site work required for the property or
the easement, the cost incurred in extending utilities to the Property including
the cost incurred in obtaining  any grants of easements  for ingress,  egress or
utilities  over real property  owned by persons or entities other than the prime
lessor,  supplies,  reasonable  travel  expenses,  cost of overhead  incurred by
contractors in the  performance  of this  Agreement  fees for building  permits,
licenses and inspections, fees or assessments imposed by local, state or federal
governmental  entities  including but not limited to the FCC and FAA,  insurance
premiums paid by BTS Company during the construction period,  recording fees and
filing fees, fees and payments on construction,  interim or permanent financing,
mortgage brokerage fees, fees of engineers, surveyors, architects, attorneys and
others providing professional services,  brokerage commissions, and premiums for
contractor's  faithful  performance and or mechanic's lien bonds  ("Construction
Costs").  Construction  Costs shall not include the cost of Horizon's  Equipment
(as used  herein,  "Horizon's  Equipment"  shall  mean all  antennas,  microwave
antennas,  hardware and lines, GPS antennas,  hardware and lines, coaxial cable,
jumpers,  connectors,   waterproof  kits,  hoisting  grips,  mounting  brackets,
generators,  battery  backup kits,  BTS equipment and BTS mounting  platforms or
equipment)  or any  costs  associated  with  the  delivery  or  installation  of
Horizon's  Equipment.   Horizon  shall  be  solely  responsible  for  purchasing
Horizon's  Equipment,  the delivery and installation of Horizon's  Equipment and
the costs associated with these goods and services.

<PAGE>
                                        [***] - CONFIDENTIAL TREATMENT REQUESTED

     4.4  COVENANT TO  CONSTRUCT.  BTS Company  shall act with due  diligence to
construct the Tower  Facilities at minimum in accordance with Horizon's  minimum
specifications.  BTS Company  shall use due  diligence  to obtain all  necessary
permits and approval of the Plans from all applicable governmental agencies. BTS
Company will install Horizon's Equipment to agreed upon specifications,  perform
sweep tests and document  results meeting or exceeding  Horizon's  standards and
set  Horizon's  BTS  equipment  and  connect to  grounding  system  and  provide
resistance to ground tests yielding 5 ohms or less for a fee which is defined in
Schedule "C" of this Agreement. BTS Company shall provide conduit for electrical
and  telephone  connections  from central  demarcation  point to  Horizon's  BTS
Equipment  location and will pull coaxial cables into the "doghouse" and install
jumpers.  Horizon  shall be  responsible  for  connecting  power,  telephone and
coaxial  cable  jumpers to  Horizon's  BTS  equipment.  BTS Company will provide
warehouse space for storage and staging of Horizon and BTS Company's Equipment.

          4.5.  COMMENCEMENT OF CONSTRUCTION.  BTS Company shall make reasonable
and  diligent  efforts to  complete  the  construction  of an  individual  Tower
Facility within sixty (60) days after Horizon  executes an SLA for the Site upon
which the Tower  Facilities  are to be  constructed.  BTS Company  shall have no
obligation to commence  construction  of the Tower Facility at a Site unless and
until an SLA has been  properly  executed by Horizon for that Site. In the event
that BTS Company  reasonably  anticipates  that the construction of a particular
Tower  Facility  at a Site  cannot be  completed  within  sixty  (60) days after
execution of an SLA, BTS Company and Horizon  shall act  reasonably  in agreeing
upon  an   alternate   number  of  days  which  will  be  required  to  complete
construction.  In the event that BTS Company fails to complete the  construction
of any Tower Facility within thirty (30) days of the date on which such Site was
scheduled  to be  completed  (as such  scheduled  completion  date may have been
extended pursuant to the previous sentence), BTS Company shall pay to Horizon as
liquidated  damages  the sum of [***]  per day for each day on which  the  Tower
Facility has not been  completed  after the scheduled  completion  date (as such
scheduled  completion  date may have  been  extended  pursuant  to the  previous
sentence) unless Horizon elects to terminate this Agreement  pursuant to section
2.4 (c) in which event the liquidated damages provided for herein shall cease to
accrue on the effective date of such termination.  Except as provided in section
2.4(c) herein,  these  liquidated  damages shall be Horizon's sole remedy in the
event that BTS Company fails to meet such construction deadline.

     4.6. MANNER OF CONSTRUCTION.  BTS Company  represents,  warrants and agrees
that the Tower Facilities shall be constructed in a good and workmanlike  manner
and at a minimum in accordance  with Horizon's  minimum  specifications  and all
applicable federal, state and local laws, ordinances, rules and regulations. BTS
Company warrants to Horizon that all materials  furnished in connection with the
construction of the Tower Facilities will be new unless otherwise specified, and
that such  construction  will be of good  quality in  accordance  with  industry
standards, free from faults and patent defects. The warranties contained in this
section 4.6 shall run for a period of six (6) months  from the SLA  Commencement
Date, as defined in the MSA.

                                       12
<PAGE>

     4.7. NO LIENS.  BTS  Company  shall keep the Tower  Facilities  free of all
liens  and  claims  arising  out  of  or  related  to  the  performance  of  the
construction,  all liens and claims of any contractor,  subcontractor,  laborer,
mechanic or materialman for labor performed or material  furnished in connection
with the performance of the construction. In the event any such lien is recorded
against  the Site,  the BTS  Company  shall,  within  thirty (30) days after its
receipt of notice that such a lien has been recorded,  either (a) have such lien
released  of record,  or (b)  deliver to Horizon a bond,  in form,  content  and
amount and issued by a surety, reasonably satisfactory to Horizon,  indemnifying
Horizon against all costs and liabilities resulting from such lien.

     4.8.  NOTIFICATION OF COMPLETION.  BTS Company shall notify Horizon of: (i)
the expected date for  substantial  completion of the Tower  Facilities at least
fifteen (15) days before that date, and (ii) the date when the Tower  Facilities
have been  substantially  completed  ("Notice of Completion").  Within three (3)
business  days  after the Notice of  Completion,  Horizon  shall  deliver to BTS
Company a list of items  ("Punch  List") that Horizon deems  necessary  that BTS
Company complete or correct in order for the Tower Facilities to be completed in
accordance with Horizon's minimum specifications for the applicable Search Ring.
The Tower  Facilities shall be deemed accepted by Horizon if a Punch List is not
received by BTS Company  within three (3) business days of the date of Notice of
Completion.  In the event that Horizon delivers a Punch List to BTS Company, the
notification process set forth in this section shall be iterated until the Tower
Facilities   have  been   completed  in  accordance   with   Horizon's   minimum
specifications for the applicable Search Ring and any approved Change Orders.

                  V. REPRESENTATIONS, WARRANTIES AND COVENANTS

     5.1 MUTUAL REPRESENTATIONS, WARRANTIES AND COVENANTS. Each party represents
and warrants to the other party,  which  representations  and  warranties  shall
continue for the term of the Agreement and the  consummation of the transactions
herein contemplated, that:

                                       13
<PAGE>

          (a) it has full power and  authority to execute and perform  under the
Agreement;

          (b) the execution, delivery and performance of the Agreement have been
duly  authorized  by all  necessary  action  on the part of such  party  and the
Agreement is binding and  enforceable  against such party in accordance with its
terms;

     The parties  covenant and agree to use their best efforts to cooperate with
each  other  in the  performance  of  their  respective  obligations  under  the
Agreement, and to take no action that will interfere with the performance by the
other party of such obligations.

     5.2 BTS COMPANY'S REPRESENTATIONS, WARRANTIES, AND COVENANTS.

          (a) BTS Company is a corporation duly organized, validly existing, and
in good  standing  under the laws of the State of  Florida  and that,  as of the
Effective  Date, it is qualified to do business in and is in good standing under
the laws of the following states: Ohio, Kentucky, West Virginia, Tennessee.

          (b) BTS Company  warrants it shall  perform the Services in accordance
with  the  current  standards  of  care  and  diligence  normally  practiced  by
recognized firms in performing  services of a similar nature. If, during the six
(6) month  period  following  the  completion  of any of the  Services,  Horizon
observes  that the Services or a portion of the Services  were  incompletely  or
incorrectly  performed  and notifies BTS Company of the same within that period,
BTS Company shall  promptly  complete or correct such  Services  without cost or
expense to Horizon.

          (c) BTS  Company  shall  comply  with  all  local,  municipal,  state,
federal, and governmental laws, orders, codes, and regulations applicable to BTS
Company's  provision  of  Services.  BTS Company has all  necessary  licenses to
perform the Services and shall provide copies of same to Horizon.

     5.3 HORIZON'S REPRESENTATIONS, WARRANTIES AND COVENANTS.

          (a) Horizon  represents  and warrants  that all  information  which it
shall provide to BTS Company in connection  with BTS  Company's  performance  of
Service hereunder shall be true and complete in all material respects.

          (b) Horizon covenants that, in a timely fashion,  it shall provide all
information  which  BTS  Company  reasonably  requests,   not  otherwise  freely
available  to BTS Company,  deemed  necessary or desirable by BTS Company in the
course  of its  provision  of the  Services,  including,  but  not  limited  to,
information  to be  supplied  in  connection  with  the  zoning,  permitting  or
construction process.

          (c) Horizon is a corporation  duly organized,  validly existing and in
good  standing  under the laws of the State of Delaware and as of the  Effective
Date, it is qualified to do business in and is in good standing

                                       14
<PAGE>

under  the  laws  of  the  following  states:  Ohio,  Kentucky,  West  Virginia,
Tennessee.

     5.4 CONFIDENTIAL INFORMATION

          (a) USE OF CONFIDENTIAL INFORMATION. In order to permit the parties to
perform their respective obligations under this Agreement,  each party may, from
time to time,  disclose to the other  confidential  or proprietary  information.
Such  confidential  or proprietary  information  and the terms of this Agreement
shall  constitute   "Confidential   Information".   Each  party  shall  use  all
Confidential  Information  solely for the purpose of performing its  obligations
under this  Agreement.  Neither party shall disclose to any other person,  other
than employees or agents of the party who agree,  in writing,  to be bound by an
equivalent undertaking,  any Confidential Information. BTS Company agrees not to
disclose any of Horizon's Confidential Information or any information pertaining
to the Sites to a competitor of Horizon.  Horizon  agrees not to disclose any of
BTS Company's  Confidential  Information  or any  information  pertaining to the
Sites to a competitor of BTS Company.

          (b) EXCEPTIONS.  The  aforementioned  restrictions  shall apply to all
Confidential Information with the exception of the following:

               (i) Confidential Information which is made public by either party
while performing under this Agreement or which otherwise is or hereafter becomes
part of the public domain  through no wrongful  act,  fault or negligence on the
part of the other party;

               (ii)  Confidential  Information  which  a  party  can  reasonably
demonstrate is already in such party's possession and not subject to an existing
agreement of confidentiality;

               (iii)  Confidential  Information  which is received  from a third
party without restriction and without breach of an agreement with Horizon or BTS
Company;

               (iv) Confidential Information which is independently developed by
a party as evidenced by its records; or

               (v)  Confidential  Information  which either party is required to
disclose pursuant to a valid order of a court or other  governmental body or any
political subdivision thereof, provided that, to the extent that it may lawfully
do so, the  disclosing  party shall  provide the affected  party with  immediate
written  notice  of the  nature  of the  required  disclosure  and  shall  where
appropriate,  provide that party with the  opportunity to interpose an objection
or  obtain  a  protective  order  restricting  the  use  and  disclosure  of the
Confidential Information; or

               (vi) in  defense of a legal  action or  otherwise  required  by a
governmental agency or applicable law.

                                       15
<PAGE>

          (c)  MARKETING  OF  SITES.   Notwithstanding  the  foregoing,  nothing
contained  herein shall be construed to prevent BTS Company from marketing space
on the Tower  Facilities to be constructed on a particular Site after the Ground
Lease has been executed by the ground lessor and BTS Company.

             VI. OWNERSHIP OF WORK PRODUCT AND INTELLECTUAL PROPERTY

     6.1  OWNERSHIP OF WORK  PRODUCT.  BTS Company  shall  promptly  disclose to
Horizon all written work  product  generated  in the course of  performing  Site
Acquisition  Services  and all facts  respecting  such work  product  (the "Work
Product"). To the extent that Horizon pays BTS Company for the Work Product, BTS
Company hereby assigns to Horizon all of BTS Company's  right title and interest
in Work Product  including  without  limitation all engineering or architectural
drawings and specifications developed by BTS Company in connection with the Site
Development  Services and all intellectual  property rights embodied therein. In
addition, to the extent that Horizon pays BTS Company for the corresponding Work
Product, all inventions, discoveries, and other intellectual properties, whether
or not  patentable,  that are conceived or reduced to practice by BTS Company in
connection with the Site Development Services, are the sole property of Horizon,
and BTS Company hereby fully and forever assigns same to Horizon.

     In  addition,  to  the  extent  that  Horizon  pays  BTS  Company  for  the
corresponding  work product all materials that BTS Company develops and delivers
to Horizon  pursuant  to this  Agreement  shall  become  the sole and  exclusive
property  of Horizon  without  limitation.  BTS  Company  agrees to execute  all
documents  and to take all steps that  Horizon  deems  necessary or desirable to
protect Horizon's ownership and property rights of these materials.

     No  Implied  Rights or  Licenses.  Except  as  provided  elsewhere  in this
Agreement,  no rights or licenses to the Work Product or Horizon's  Confidential
Information  or to  trademarks,  inventions,  copyrights,  or  patents  embodied
therein are implied or granted under this Agreement.

     6.2 OWNER'S RIGHT TO COMPLETE WORK. If BTS Company  defaults or neglects to
carry out any of its obligations,  or takes any action,  or omits to do anything
which  endangers  safety,  or risks  damage or injury to persons or property and
fails within a five (5) day period after receipt of reasonable  detailed written
notice from Horizon not to commence and continue  correction  of such default or
neglect  with  diligence  and  promptness,  Horizon  may  correct all such work,
omissions,  or deficiencies,  and Horizon shall be entitled to recover costs and
expenses,  including  reasonable  attorneys' fees,  pertaining  thereto from BTS
Company.  This remedy  provided for in this section 6.2 shall be in addition to,
and not in lieu of any other  right or remedy  which may be  afforded to Horizon
herein or under applicable law.

                             VII. DISPUTE RESOLUTION

     7.1 ARBITRATION  PROCEDURE.  If the parties in this Agreement are unable to
resolve any dispute  arising out of or relating to this  Agreement  either party
may refer such  dispute for  resolution  by final and binding  arbitration.  The
party  submitting  a dispute to  arbitration  shall give notice  thereof to each
other party to such dispute and to the  President  of the  American  Arbitration

                                       16
<PAGE>

Association,  who shall  select an  arbitrator  (the  "Arbitrator")  who (i) has
expertise and at least five years'  experience in matters directly involved with
the type of services to be performed under this Agreement in the geographic area
in which the  obligations  hereunder are to be performed,  (ii) certifies to all
parties  that  he/she is  independent  of the parties to the dispute and will be
able to render an impartial decision,  and (iii) agrees to proceed in accordance
with the applicable provisions of this Section VII.

     The Arbitrator shall hold one or more hearings to begin within fifteen (15)
days of his/her  selection,  shall furnish a written decision within  forty-five
(45) days of his/her selection,  and shall provide an opinion  demonstrating the
basis for such decision.  The Arbitrator may also attempt to mediate the dispute
between parties if requested to do so by both of the parties.

     The  parties  hereto  agree  to  exchange  promptly  any and  all  relevant
documentation as the Arbitrator may order. All arbitration proceedings hereunder
shall be  conducted  in private,  and each party  hereby  agrees to maintain the
confidentiality  of the enforcement of the award.  All  arbitration  hearings or
mediation sessions are to be held in the Chillicothe, Ohio area unless otherwise
agreed  by the  parties,  and  arbitration  hearings  need not be  conducted  in
accordance with formal rules of evidence.

     The Arbitrator may determine the procedure for hearings which may, but need
not  include  (a)  direct  testimony  of  witnesses;  (b)  cross-examination  of
witnesses; (c) submission of sworn statement or affidavits; (d) consideration of
relevant documents;  and (e) consideration of other matters which the Arbitrator
considers to be helpful in making his/her decision.

     7.2  COST  OF  ARBITRATION.   The  Arbitrator's  fees  and  other  expenses
associated with  arbitration  shall be borne equally by the parties,  unless the
Arbitrator finds that the position of one party is frivolous or unreasonable, in
which case, the  Arbitrator may require the offending  party to pay all fees and
expenses (or some disproportionate amount) associated with the arbitration.

     7.3 CONTINUED  PERFORMANCE.  At all times during the course of  arbitration
proceedings,  the  parties  shall  continue  in  good  faith  to  perform  their
respective  obligations  under this Agreement to the extent such obligations are
not in dispute. If a disputed issue is impeding continued  performance by either
party,  the  Arbitrator  may adopt an expedited  schedule upon request of either
party.  Notwithstanding the foregoing,  should BTS Company not be paid in timely
fashion for any Service not disputed and not subject to arbitration proceedings,
BTS Company may suspend its performance of such Service.

     7.4 AWARD  ENFORCEMENT.  The arbitrator  may award monetary  damages and/or
make a  binding  order,  and the  parties  hereby  agree  that an  award  of the
Arbitrator  hereunder  may be  enforced  by either  party in the  United  States
District Court which has jurisdiction over matters arising in Chillicothe, Ohio.

     7.5 THIRD PARTY  GUARANTEES AND WARRANTIES.  If any of the Site Acquisition
or  Construction  Management  Services  requires  the  purchase of  equipment or

                                       17
<PAGE>

materials or the  procurement  of services,  BTS Company  shall make  reasonable
efforts to obtain from all vendors and  subcontractors  commercially  reasonable
guarantees  and  Warranties  with  respect  to  such  equipment,  materials  and
services.  BTS Company's  liability with respect to such equipment and materials
obtained  from  vendors  or  services  from  subcontractors  shall be limited to
procuring  guarantees  from such vendors or  subcontractors  and  rendering  all
reasonable  assistance to Horizon as part of the Site  Development  Services for
the purpose of enforcing the same.

     7.6 PERMITS.  BTS Company  shall  (without  additional  compensation)  keep
current all governmental  permits (other than Building  Permits),  certificates,
and  licenses  (including  professional  licenses)  required by law to be in BTS
Company's name necessary to perform the Services.

     7.7  PUBLICITY.  Neither  party  shall make news  releases  or issue  other
advertising  pertaining  to the  Site  Acquisition  Services  or this  Agreement
without prior written approval of the other party;  provided however,  that both
parties agree to either approve or deny such news release or advertising  within
two (2) business days of the request for approval  from the other party.  In the
event a party fails to either approve or deny such news release or advertisement
within two (2) business days, such news release of advertisement shall be deemed
approved.

     7.8  NOTICES.  All notices or other  communications  hereunder  shall be in
writing  and shall be deemed to have been  duly  delivered  and  effective  upon
receipt if personally  delivered,  or on receipt if mailed by prepaid  overnight
express  service,  addressed to the following (or other addresses as the parties
hereto may designate):

     If to Horizon, to:                      If to BTS Company, to:
     ------------------                      ----------------------
     Horizon Personal Communications, Inc.   BTS Company
     68 East Main Street                     SBA Towers, Inc.
     P.O. Box 480                            One Town Center Road, 3rd  Floor
     Chillicothe, Ohio 45601-0480            Boca Raton, FL 33462
     Attn:  Vice President Technology        Attn:  General Counsel

     7.9 BINDING EFFECT. The Agreement shall be binding upon and enforceable by,
and  inure to the  benefit  of,  successors,  assigns,  and  transferees  of the
parties.

     7.10 FURTHER ASSURANCES. The parties shall execute and deliver such further
instruments and perform such further acts as may reasonably be required to carry
out the intent and purposes of this Agreement.

     7.11 CHOICE OF LAW.  The  Agreement  shall be governed by and  construed in
accordance  with the laws of the State of Ohio,  excluding  the  conflict of law
provisions thereof.

     7.12 WAIVER.  The failure of either party to insist upon strict performance
of any obligation  hereunder,  irrespective of the length of time for which such
failure  continue,  shall not be a waiver of such party's right to demand strict
compliance in the future. No consent or waiver, express or implied, to or of any

                                       18
<PAGE>

breach  or  default  in  the  performance  of  any  obligation  hereunder  shall
constitute  a consent  or waiver to or of any  other  breach or  default  in the
performance of the same or any other obligation hereunder.

     7.13  SEVERABILITY.  In  case  any  term of this  Agreement  shall  be held
invalid,  illegal,  or unenforceable in whole or in part neither the validity of
the remaining part of such term nor the validity of the remaining  terms of this
Agreement shall in any way be affected thereby.

     7.14 HEADINGS.  All section and paragraph  titles or captions  contained in
this Agreement arc for convenience only and shall not be deemed part of the text
of this Agreement.

     7.15 PRONOUNS.  All pronouns and any variations  thereof shall be deemed to
refer to the masculine, feminine, neuter, singular, or plural as the context may
require.

     7.16  COUNTERPARTS.   This  Agreement  may  be  signed  in  any  number  of
counterparts,  each of which shall be  considered  an original  and all of which
taken together shall constitute one and the same instrument.

     7.17 MODIFICATION;  AMENDMENT;  ADDITIONAL SERVICES.  This Agreement may be
amended  only by a written  instrument  executed  by an  officer  or  authorized
representative  of each of the parties.  In the event that the  parties,  at any
time,  desire  BTS  Company to  provide  services  other than the types of those
provided for in this Agreement, then, at such time, the parties shall execute an
amendment to Sections III and IV of this Agreement, describing such services and
the payment to be made therefor in a manner substantially  similar to the manner
in which Services and payment for Services are presently  described therein.  In
the vent that the parties so amend this  Agreement,  the  agreement  as amended,
shall continue in full force and effect thereafter.

     7.18  CONSTRUCTION  OF  AGREEMENT.  This  Agreement  shall  be  interpreted
according  to its plain  meeting  and shall not be  strictly  construed  against
either party.

     7.19 ENTIRE  AGREEMENT.  This Agreement,  the MSA, and the Site Development
Agreement  ("Site  Development  Agreement")  which are  executed  simultaneously
herewith  between  Horizon  and  BTS  Company  and  the APA  which  is  executed
simultaneously  herewith contain the entire understanding  between and among the
parties  and  supersede  any prior  understandings  and  agreements  among  them
respecting the subject matter of this Agreement.

     7.20  CONDITIONS  PRECEDENT.  BTS Company shall have the right to terminate
this Agreement if the following  conditions have not been satisfied prior to the
Closing  (as that  term is  defined  in the  APA):  1) a BTS  Agreement  in form
substantially  similar to this  Agreement  has been entered into between  Bright
PCS, LLC and BTS Company;  and 2) this  Agreement has been approved by the Board
of  Directors  of BTS  Company.  In the event that BTS  Company  fails to obtain
approval of this  Agreement by its Board of Directors on or before  September 1,
1999,  this Agreement  shall  terminate and BTS Company shall pay to Horizon the
sum of Fifty Thousand  andNo/100  Dollars  ($50,000.00).  In the event that this
Agreement is  terminated  pursuant to this section  7.20,  Horizon shall pay BTS

                                       19
<PAGE>

Company for any services  provided  hereunder in accordance with Section 2.2 and
BTS Company  shall  deliver  all Work  Product to Horizon as provided in section
6.1.

     7.21 NO  BROKERS;  INDEMNIFICATION  FROM  BROKER'S  FEES.  Horizon  and BTS
Company hereby represent, agree an acknowledge that no broker or other person is
entitled to claim or to be paid a commission  as a result of the  execution  and
delivery of this Agreement. Each of the parties shall indemnify, defend and hold
the other party  harmless  for all claims,  damages,  liabilities  and  expenses
(including  attorney's fees) arising from a  misrepresentation  arising from the
first sentence of this paragraph.

     IN  WITNESS  WHEREOF,  BTS  Company  and  Horizon  have duly  executed  and
delivered this  Agreement.  The party last executing this Agreement shall insert
the date of such  execution  on the first page  hereof,  which date shall be the
Date of this Agreement.

                               BTS COMPANY:

                               SBA TOWERS, INC.

                               By:_________________________________
                               Title:______________________________
                               Attest:_____________________________

                                           [CORPORATE SEAL]

                                HORIZON:

                                HORIZON PERSONAL
                                COMMUNICATIONS, INC.

                                By:_________________________________
                                Title:______________________________

                                       20
<PAGE>

                                  SCHEDULE "A"
                            SITE ACQUISITION SERVICES

1.   Search  Ring  Background  Workup.  BTS  Company  shall  prepare  a  zoning,
     construction,  and land use analysis of the geographic area covered by each
     Search Ring, which will include, at a minimum:

     a.   Listing of all state and local jurisdictions;

     b.   Zoning process descriptions;

     c.   Zoning  maps in both  hardcopy  and  softcopy  formats,  to the extent
          possible;

     d.   Zoning application forms, and estimates of necessary fees;

     e.   Zoning meeting schedules;

     f.   Sample construction and land use permit applications, forms, estimates
          of  necessary  fees,  identity  of  permitting  authorities  and their
          various meeting schedules;

     g.   Contact  information (name,  address,  affiliation,  phone, e-mail and
          fax) for key zoning, construction, and land use permitting personnel;

     h.   Background report on community awareness, issues, and concerns related
          to PCS infrastructure deployment

     i.   Identified Federal Aviation Administration (FAA) restrictions;

     j.   Identified environmental restrictions.

2.   Site Identification, Acquisition, Zoning and Permitting

     a.   BTS Company shall identify at least two possible  locations on which a
          Collocation  Site or a BTS Site could be located  within  each  Search
          Ring.  Each candidate  Site shall be submitted to Horizon,  which will
          certify  in  writing  to BTS  Company  whether  each such  Site  meets
          Horizon's  requirements  within  ten  (10)  days of  such  submission.
          Submission  of the Site  shall  be made to the  person  designated  by
          Horizon  from  time  to  time.  Horizon  shall  designate  one  of the
          candidate Sites as the Preferred Candidate.

     b.   BTS Company  shall  negotiate  the purchase or lease of the  Preferred
          Candidate within each Search Ring. If the Preferred Candidate is a BTS
          Site,  the purchase or lease  agreement for such Site shall be between

                                       21
<PAGE>

          the  landowner  and BTS Company  and shall be on terms and  conditions
          substantially  similar to the  agreement  which is attached  hereto as
          Exhibit  "B"  (hereafter  the "Ground  Lease").  In no event shall BTS
          Company agree to material modifications to the provisions set forth in
          paragraph  35 of the Ground  Lease  without  Horizon's  prior  written
          approval.  In the event that the Preferred  Candidate is a Collocation
          Site,  the lease for such Site  shall be  between  the  landowner  and
          Horizon. The purchase and lease terms for each Collocation Site shall,
          upon completion of their  negotiation by BTS Company,  be submitted to
          Horizon in  writing,  and  Horizon  shall  accept or reject  same,  in
          writing  (acceptance  may be by execution of documents  presented,  if
          appropriate).

     c.   For  all BTS  Sites,  BTS  Company  shall  conduct  a  thorough  title
          investigation in accordance with generally accepted industry standards
          to  ensure  that BTS  Company  has a valid and  enforceable  leasehold
          interest  in the Site and that the  intended  use of such  Site is not
          prohibited or  unreasonably  restricted.  For Collocation  Sites,  BTS
          Company shall, at the express written direction of Horizon order title
          abstracts,  coordinate  a  full  title  search,  and/or  obtain  title
          insurance.

     d.   For all BTS Sites,  BTS  Company  shall  have a Phase I  environmental
          assessment  and a NEPA  analysis  conducted to ensure that the site is
          free from  environmental  contamination  and that  construction of the
          Site does not require FCC approval.  At the express written  direction
          of  Horizon,  BTS  Company  shall  coordinate  a  "Phase  I" or  other
          environmental surveys for approved and accepted Collocation Sites.

     e.   BTS Company shall obtain all land use permits and/or zoning  variances
          required for each approved and accepted Site if any are necessary.  If
          no approvals or variances  are  required,  BTS Company  shall  provide
          proof  thereof.  In  connection  with  obtaining  these  approvals and
          variances, BTS Company shall:

          i.   Submit complete zoning applications with all necessary exhibits;

          ii.  Attend necessary  meetings,  including zoning hearings,  planning
               meetings, and community meetings, as a representative of Horizon;

          iii. Coordinate community outreach programs, expert witness testimony,
               and other  measures  which may be  required to assure the zoning,
               construction, and land use of approved and accepted Sites.

          iv.  Secure all required construction permits on behalf of BTS Company
               and Horizon.

                                       22
<PAGE>

3.       Documentation of Site Acquisition Services.

         BTS Company shall  maintain a  comprehensive  record (both hardcopy and
         electronic  copy, when available)  indexed by Site, which shall include
         the following elements, at a minimum:

          a.   Site Survey Report for each of the Sites presented to Horizon for
               approval,   consisting  of  property  name,  address,   latitude,
               longitude,   photos,  site  owner  or  property  manager  contact
               information, and proposed lease rate or purchase price;

          b.   For each of the approved and accepted  Sites,  the fully executed
               lease agreement or purchase document with all exhibits;

          c.   For each of the approved and accepted Sites,  the copy of zoning,
               construction,  and  land use  applications  and  zoning  variance
               requests, if any, with all exhibits;

          d.   For each of the approved and accepted Sites, the copy of the land
               use permits;

          e.   For  each  of the  approved  and  accepted  Sites,  the  Landlord
               approval of construction  plans,  and other indicia of compliance
               with lease terms;

          f.   For  each  of  the  approved  and  accepted  Sites,  copy  of the
               construction permits.

     4.   Organizational Interfaces

          a.   BTS Company shall designate one or more points of contact,  as it
               deems  efficient,   in  order  to  communicate  effectively  with
               Horizon.  BTS Company shall obtain  Horizon's  explicit  approval
               before  obligating   Horizon   financially,   contractually,   or
               otherwise.

          b.   BTS Company shall coordinate the activities of the  Architectural
               and Engineering (A&E) firms during the site acquisition phase, to
               include the  development of  site-specific  drawings for landlord
               approval and for zoning purposes.

          c.   BTS Company  shall  coordinate  all site  visits  during the site
               acquisition  phase,  to  include  at  a  minimum:  site  surveys,
               technical team visits,  drive tests,  construction  surveys,  A&E
               surveys, geotechnical surveys, and environmental surveys.

          d.   BTS  Company  shall  work  to  ensure  a  smooth   transition  of
               site-related  activities  from Site  Acquisition to  Construction
               Management.

          e.   BTS  Company  shall   procure  on  behalf  of  Horizon   required
               discretionary (zoning,  construction,  and land use) entitlements
               and  other  permits,  including  building  permits  required  for

                                       23
<PAGE>

               completion of Sites from state and local  government  authorities
               and from agencies of the United States  Government other than the
               Federal Communications Commission ('FCC').

          f.   BTS  Company  will from time to time  provide  Horizon  with such
               financial  information as Horizon deems  reasonably  necessary to
               track costs associated with the development of the Sites.

                                       24
<PAGE>

                                  SCHEDULE "B"
                        CONSTRUCTION MANAGEMENT SERVICES

The  Construction  Management  Services  to be  performed  by BTS Company are as
follows:

1.   For all approved  and accepted  Sites,  BTS Company  shall,  as required by
     Horizon,  continue its installation of Horizon's Equipment on such Sites by
     acting as the construction manager in the capacity of general contractor to
     Horizon.

2.   The  Minimum  Construction  Management  Services  which BTS  Company  shall
     perform include:

     a.   Ordering and permitting  access and delivery for the  installation  of
          commercial electrical power.

     a.   Permitting access to, arranging for, scheduling  accepting delivery of
          telephone service as ordered to be installed by BTS Company.

     b.   Management  and  supervision  of day-to-day  construction  activities,
          including

          i.   Site access preparation;

          ii.  Site preparation;

          iii. Electrical connection, power, and grounding;

          iv.  Antenna mounting and coaxial routing and mounting;

          v.   Placement of OEM equipment;

          vi.  Safety and OSHA compliance.

2.   BTS Company Operating Standards.

     a.   All  construction  activities shall fully comply with Sprint Spectrum,
          L.P.'s  standards for quality,  as well as with all local,  state, and
          national codes and laws.

     b.   BTS Company shall present and fully implement a  comprehensive  safety
          program.  BTS Company shall  demonstrate its corporate  safety record.
          BTS Company shall  document and report safety  hazards,  environmental
          concerns, and other abnormal situations immediately.

                                       25
<PAGE>

3.   Subcontractor and Supplier Management.

     a.   BTS Company shall select all subcontractors and suppliers. BTS Company
          shall develop  subcontractor  and supplier  selection  standards.  BTS
          Company shall implement a subcontractor  and supplier election process
          that reflects the best interests of Horizon at all times.

     b.   BTS Company shall maintain full responsibility to Horizon for quality,
          cost,  delivery,  and  performance of all  subcontractor  and supplier
          goods and services.

4.   Materials Management

     a.   Horizon  shall  provide the  following  materials FOB at BTS Company's
          warehouse  location as  identified  from time to time,  but  initially
          located in Fort Wayne,  Indiana:  All  Antennas,  microwave  antennas,
          hardware and fines, GPS antennas,  hardware and lines,  Coaxial Cable,
          Jumpers,   Connectors,   Waterproof  Kits,  Hoisting  Grips,  Mounting
          Brackets,  Generators,  Battery  Backup kits,  BTS  equipment  and BTS
          Mounting platforms or equipment.

     b.   BIS  Company  will  provide  at its cost and retain  possession  of at
          expiration or earlier  termination  of the relevant site lease,  tower
          platforms, ice bridges, towers, fencing,  grounding systems, power and
          telephone  connections to a central demarcation point within the tower
          compound,  and a concrete  equipment pad as specified by site diagrams
          for Horizon's BTS Equipment and Battery Backup.

     c.   BTS  Company  will  install  each  of the  foregoing  to  agreed  upon
          specifications,  perform sweep tests and document  results  meeting or
          exceeding  Horizon standards and set Horizon BTS equipment and connect
          to grounding system and provide  resistance to ground tests yielding 5
          ohms or less,  for a fee defined in Schedule  "C".  BTS Company  shall
          provide conduit for electrical and telephone  connections from central
          demarc point to Horizons BTS Equipment  location and will pull coaxial
          cables into the  "doghouse"  and  install  jumpers.  Horizon  shall be
          responsible for connecting power,  telephone and coaxial cable jumpers
          to Horizon's BTS equipment.

     d.   BTS Company  will provide  warehouse  space for storage and staging of
          Horizon  and BTS  Company's  equipment  and will  implement  inventory
          control and security processes acceptable to Horizon.

5.   Final Deliverables. As the final deliverable of its Construction Management
     Services,  BTS Company shall deliver to Horizon a written  Closeout  Report
     for each CMS site  within  10 days of  completion,  which  shall  include a
     thorough  and fully  approved  close out  package of all  Sites.  Close out
     activities shall include,  but are not limited to final  inspection,  punch
     list development and resolution, and final walk-through and inspection with
     Horizon.  BTS  Company  shall  not have  completed  close  out until it has

                                       26
<PAGE>

     received  notice  from  Horizon  of  completed  close out  following  final
     walk-through  and  inspection,  which  notice  shall  not  be  unreasonably
     withheld.

6.   Documentation  of  Construction   Management  Service.  BTS  Company  shall
     maintain  comprehensive  records  for  each  site  for  which  it  performs
     Construction Management Services,  indexed by CMS Site, which shall include
     the following, at a minimum:

     c.   land use permit,

     d.   construction and related permit,

     e.   current construction status,

     f.   detailed financial  accounting records,  including but not limited to,
          approved purchase orders price quotations and selections criteria; and
          verification of goods or services received.

7.   Organizational Interfaces.

     g.   BTS Company shall designate one or more points of contact, as it deems
          efficient,  in order to  communicate  effectively  with  Horizon.  BTS
          Company shall obtain Horizon's  explicit prior written approval before
          obligating Horizon financially, contractually, or otherwise.

     h.   BTS Company shall coordinate the activities of the  Architectural  and
          Engineering  (A&E) firms  during the  construction  phase,  to include
          ensuring that basic site drawings  provided by Horizon are tailored to
          the specific requirements of individual Sites.

     i.   BTS Company shall  coordinate all site visits during the  construction
          phase, to include at a minimum:  site surveys,  technical team visits,
          drive  tests,  construction  surveys,  architectural  and  engineering
          surveys, geotechnical surveys, and environmental surveys.

     d.   BTS  Company  shall  from  time  to time  provide  Horizon  with  such
          financial  information as Horizon deems reasonably  necessary to track
          costs associated with the development of the Sites.

     e.   BTS Company shall coordinate its Construction Management Services with
          Horizon to insure that each Site delivered by BTS Company  pursuant to
          the  terms  of  this  Agreement   shall  be  ready  for  delivery  and
          installation  of  equipment in  accordance  with  Horizon's  equipment
          vendor contracts,  and that all conditions to such equipment  vendor's
          installation  of equipment and performance of services on a Site shall
          have been fulfilled.  No Site shall be deemed  completed unless it has
          been  delivered  to  Horizon  in  accordance  with  the  terms of this
          Section.

                                       27
<PAGE>
                                        [***] - CONFIDENTIAL TREATMENT REQUESTED

                                  SCHEDULE "C"
   PAYMENT FOR SITE ACQUISITION SERVICES AND CONSTRUCTION MANAGEMENT SERVICES

IV.  PAYMENT

     A.   COMPENSATION  FOR SITE  ACQUISITION  AND  CONSTRUCTION  COSTS  FOR BTS
          SITES.

     BTS Company shall be solely  responsible for all costs associated with Site
Acquisition  Services  for all sites on which the  Preferred  Candidate is a BTS
Site. BTS Company shall by solely  responsible for all costs associated with the
construction  of the Tower  Facilities  on each BTS Site.  Horizon shall pay BTS
Company for Construction  Management  Services which are rendered by BTS Company
on BTS Sites in  accordance  with  paragraph  B(2)  below as if such Site were a
Collocation Site.

     B.   COMPENSATION FOR SERVICES ON SITES

          1.   Site Acquisition Fees

               a.   Per Site Fees for Site  Acquisition on Collocation  Sites In
                    consideration  for  performance of the Site  Acquisition for
                    Collocation Sites Horizon shall pay BTS Company,  the sum of
                    [***] per Site on which zoning approval is not required, and
                    the sum of  [***]  per  Site on  which  zoning  approval  is
                    required, in the manner set forth below:

------------------------------------------------------------------------------
Milestone                             Amount Due
------------------------------------------------------------------------------
Upon, RF approval of a completed      [***]
Site Survey Report
------------------------------------------------------------------------------
Upon, fully executed lease or         [***]
purchase agreement for a site
------------------------------------------------------------------------------
Upon receipt of zoning approval       [***]
(if applicable)
------------------------------------------------------------------------------
Upon, Issuance of a building          [***]
permit or equivalent approval
------------------------------------------------------------------------------
Total amount due upon completion      [***] for sites on which zoning
of Site Development Services          approval is required of Site Development

                                      [***] for sites on which zoning
                                      approval is not required
------------------------------------------------------------------------------

                                       28
<PAGE>
                                        [***] - CONFIDENTIAL TREATMENT REQUESTED

               b.   Per  Site  Fees  for  Site   Acquisition  on  BTS  Sites  In
                    consideration   for  performance  of  the  Site  Acquisition
                    Services for BTS Sites for which  payment is due pursuant to
                    this Agreement,  Horizon shall pay BTS Company in accordance
                    with  this  Agreement,  an amount  not to exceed  the sum of
                    [***] per Site in the manner set forth below.

------------------------------------------------------------ -----------------
Milestone                                                    Amount Due
------------------------------------------------------------ -----------------
Upon, RF approval of a completed Site Survey Report          [***]
------------------------------------------------------------ -----------------
Upon, fully executed lease or purchase agreement for a site  [***]
------------------------------------------------------------ -----------------
Upon receipt of zoning approval (if applicable)              [***]
------------------------------------------------------------ -----------------
Upon, Issuance of a building permit or equivalent approval   [***]
------------------------------------------------------------ -----------------
Total amount due upon completion of Site Development         [***]
Services
------------------------------------------------------------ -----------------

               c.   Reimbursement for Per Site Advances

               i.   Non-Reimbursable  Costs. BTS Company's  compensation for the
                    Site  Acquisition  Services  on  Collocation  Sites shall be
                    inclusive of customary  out-of-pocket  expenses  incurred by
                    BTS Company in the performance of its obligations  hereunder
                    ("Per Site Fee"), including, without limitation;

                    (a)  wireless equipment and services;

                    (b)  field expenses for maps, deeds, and film development;

                    (c)  vehicle expense; and

                    (d)  travel and living expenses.

                    Any  extraordinary or other expenses that BTS Company should
                    reasonably anticipate  incurring,  which are not customarily
                    incurred  in  the  ordinary  course  of  business,  must  be
                    pre-approved  by Horizon in order for BTS Company to receive
                    reimbursement for such expenditures.

                                       29
<PAGE>

                    ii.  Reimbursable Costs.

                    In the event that BTS Company provides or contracts directly
                    with third parties, trade contractors, and subcontractors in
                    connection with its provision of Site  Acquisition  Services
                    for Collocation  Sites, the following  expenses (in addition
                    to other  expenses  which the parties may agree to from time
                    to time)  shall be  considered  pass  through  costs  and be
                    reimbursed to BTS Company to the extent not paid directly by
                    Horizon in accordance with IV(a) above,  provided,  however,
                    that  Horizon  shall  be  obligated  to  reimburse  expenses
                    incurred  by BTS  Company  only  with  respect  to which BTS
                    Company  had  received   express   written   direction  from
                    Horizon.:

                    (a.) Any  and  all   construction   materials  used  in  the
                         installation of Horizon's Equipment on the Site;

                    (b.) Any and all construction  subcontractor cost including,
                         but not limited to, cable and antenna  contractors  and
                         electricians;

                    (c.) Architectural and electrical engineering drawings;

                    (d.) Azimuth verification surveys;

                    (e.) Blueprint reproduction;

                    (f.) Building  inspection fees; except that Horizon will not
                         pay   for  any   expedited   delivery   costs,   unless
                         specifically authorized by Horizon

                    (g.) Cable sweeps and other technical tests;

                    (h.) Costs involved in varying zoning compliance,  including
                         permit and inspection fees;

                    (i.) Delivery  costs for all  materials  except that Horizon
                         will not pay for any expedited  delivery costs,  unless
                         specifically authorized by Horizon;

                    (j.) Engineering services;

                    (k.) Federal Aviation Administration study and analysis;

                    (l.) GIS/mapping;

                                       30
<PAGE>

                    (m.) Independent inspection agencies;

                    (n.) Legal  support  and  expert  witness  fees  for  zoning
                         hearings;

                    (o.) Option  fees  for  leases,   lease  options,   purchase
                         agreements,  and  purchase  agreement  options  to  the
                         extent  such  options  were   approved  by  Horizon  in
                         advance;

                    (p.) Phase I Environmental  Study including soil compaction,
                         engineering,  and  other  inspections  of the  property
                         required or  reasonably  deemed  necessary to provide a
                         thorough due diligence review of the project;

                    (q.) Photo simulations;

                    (r.) Site survey;

                    (s.) Structure   loading  study  and  analysis  for  towers,
                         rooftops,  water tanks, billboards and signs, and other
                         similar facilities expected to contain PCS equipment;

                    (t.) Appraisals,   title   reports,   and  title   insurance
                         premiums;

                    (u.) Zoning, filing, and permitting application fees and

                    (v.) Office  supplies and equipment,  but only to the extent
                         that  such  supplies  and  equipment  requests  are  in
                         compliance   with  Horizon's   standard   policies  and
                         procedures for such expenses.

     2.   Construction and Construction Management Fees.

               a.   Per CMS Site Fees. In  consideration  for performance of the
                    construction and Construction  Management  Services ('CMS'),
                    Horizon  shall pay BTS  Company  an  amount  to be  mutually
                    agreed  upon on a site by site basis in the manner set forth
                    below:

                                       31
<PAGE>
                                        [***] - CONFIDENTIAL TREATMENT REQUESTED

--------------------------------------------------------------------------
Milestones                                 Amount Due
--------------------------------------------------------------------------
Upon the commencement of construction      [***]
on the CMS Site
--------------------------------------------------------------------------
Final acceptance of civil construction     [***]
on the CMS Site
--------------------------------------------------------------------------
Total amount due per CMS Site              To be agreed upon on a site by
upon completion of Construction            site basis
Management Services
--------------------------------------------------------------------------

               b.   Withdrawal

                    In the event Horizon elects to withdraw a CMS Site,  Horizon
                    shall give BTS Company notice of such withdrawal,  and shall
                    pay BTS  Company  [***] of the  milestone  installment  that
                    would be due if the work currently in progress was completed
                    and [***] of all other work  completed on the  withdrawn CMS
                    Site as of the  date of  Horizon's  withdrawal  notice  plus
                    reimbursable  expenses and substitute the withdrawn CMS Site
                    with  an   alternative   site   within   sixty   (60)   days
                    ("Alternative CMS Site"), if available.  If Horizon does not
                    issue  an   Alternative   CMS  Site  within  sixty  days  of
                    withdrawing  a CMS Site,  then BTS Company shall be entitled
                    to receive 50% of the entire  Construction  Management  Fee,
                    for the CMS Site withdrawn.

               c.   Payments to Contractors

                    BTS Company shall be responsible for making all payments due
                    to contractors and subcontractors selected by, or contracted
                    with,  BTS  Company  to  perform  services  and  to  provide
                    materials  at the  Sites  in  connection  with  Construction
                    Management Services rendered  hereunder.  Horizon may advise
                    BTS Company in writing that Horizon will pay them  directly.
                    BTS  Company  shall  present  copies  of all  such  invoices
                    relating to the  installation  of Horizon's  Equipment which
                    BTS Company has paid,  and  Horizon  shall then  provide BTS
                    Company  reimbursement of such  disbursements  within thirty
                    (30) days of BTS  Company's  submission  of said invoices to
                    Horizon.

                    BTS Company shall furnish  evidence  satisfactory to Horizon
                    that  all  labor  furnished  and  material  consumed  by BTS

                                       32
<PAGE>

                    Company  during the invoice period has been paid in full and
                    that the  Services  are not  subject  to liens or  claims on
                    account thereof. Horizon may withhold payment of the invoice
                    until BTS Company furnishes such evidence.

     C.   TIMING OF PAYMENT

     All invoices shall be sent to Horizon's  mailing address and marked:  Attn:
Accounts  Payable.  BTS Company  shall invoice  Horizon in  accordance  with the
payment  schedule  set  forth  herein.  Such  invoice,  after  receipt  in  form
satisfactory to Horizon,  and subject to verification by Horizon,  shall be paid
within  thirty  (30)  days  of  receipt  by  Horizon.  Invoices  must be sent in
accordance  with the  invoicing  instructions  provided in this  Agreement.  All
invoices must indicate the FEIN #____________ and the correct code per line item
as invoices. These codes will be provided to BTS Company by Horizon.

     D.   PAYMENT DISPUTES

     If Horizon  disputes the amount of expenses or fees claimed by BTS Company,
Horizon  shall  notify BTS Company in writing and shall pay when due all amounts
not in dispute. If the disputed matter cannot be resolved informally between the
parties,  either  Horizon or BTS Company may request  arbitration  pursuant  the
terms of this Agreement.

     E.   LIABILITIES

     BTS Company shall remain  solely  responsible  for all matters  relating to
compensation,  unemployment disability insurance, social security,  withholding,
and all other federal,  state, and local laws,  rules and regulations  governing
such matters.

                                       33
<PAGE>

                                   EXHIBIT "A"
                                       MSA

                                       34CONFIDENTIAL TREATMENT REQUESTED

     Confidential Portions of this Agreement Which Have Been Redacted Are Marked
With  ("[***]).  The  Omitted  Material  Has  Been  Filed  Separately  With  The
Securities and Exchange Commission.

                              MASTER SITE AGREEMENT

                                 BY AND BETWEEN

                                SBA TOWERS, INC.

                                       AND

                  BRIGHT PERSONAL COMMUNICATIONS SERVICES, LLC.

<PAGE>
                        CONFIDENTIAL TREATMENT REQUESTED

                              MASTER SITE AGREEMENT

     THIS MASTER SITE  AGREEMENT  (this "MSA") is made and entered into this 1st
day of October,  1999 (the "Date of this MSA"), by and between SBA TOWERS,  INC.
("SBA"); and BRIGHT PERSONAL COMMUNICATIONS SERVICES, LLC ("Bright PCS").

                                    RECITALS:

     WHEREAS,  SBA and Bright PCS have executed that certain Master Design Build
Agreement  ("BTS  Agreement")  contemporaneously  with the execution of this MSA
which provides for the design,  development and  construction of new tower sites
("BTS Sites"); and

     WHEREAS, this MSA shall govern the BTS Sites; and

     WHEREAS,  SBA and Bright PCS will enter into a Site Agreement ("SLA") which
will   establish  the  terms  for  use  of  BTS  Sites  in  form  and  substance
substantially  similar to Attachment "A" attached hereto and by reference made a
part hereof.

     NOW,  THEREFORE,  for good and  valuable  consideration,  the  receipt  and
sufficiency of which are hereby acknowledged,  the parties hereto,  intending to
be legally bound hereby, agree as follows:

     1. MSA. This MSA sets forth the general terms and conditions upon which all
Sites (as defined below) shall be leased to Bright PCS. SBA and Bright PCS shall
execute SLAs in the form attached  hereto as Attachment "A" for each BTS Site in
accordance with the provisions of paragraph  2.7(b) of the BTS Agreement as such
Sites are  identified  from time to time.  Each SLA shall  identify a particular
Site,  made  subject to this MSA.  In the event of a conflict  or  inconsistency
between the terms of this MSA and a SLA,  the terms of the SLA shall  govern and
control for that Site.

     2. SITE.

          (a) Subject to the following terms and  conditions,  SBA hereby grants
Bright PCS the right to install,  maintain  and operate  Bright  PCS's  wireless
communications  equipment  and  appurtenances  on space on a tower on a BTS Site
("Tower") which is adequate to allow the installation of the Equipment,  as that
term is  defined  in this  paragraph  2,  with  sufficient  separation  from the
equipment  owned  by SBA or any  equipment  which  is  owned  or  operated  by a
sublessee or licensee of SBA as may be necessary  to prevent  interference  with
the  Equipment as provided in paragraph 6 of this MSA ("Tower  Space")  together
with ground  space that will not exceed two hundred  fifty (250)  square feet on
each  BTS  Site  as  described  in  this  paragraph  2  ("Ground   Space")  with
non-exclusive   easements   for  access  and   utilities  to  the  Ground  Space

                                       1
<PAGE>

(collectively  the  "Easement").  Bright PCS shall have  exclusive  control  and
dominion of the Tower  Space and the Ground  Space  provided  that SBA and other
tenants  of the BTS Site  shall  have a  non-exclusive,  temporary  construction
easement over the Site, as that term is  hereinafter  defined,  as is reasonable
and necessary for the  maintenance,  repair and installation of equipment on the
Tower, but in no event may SBA or any other entity disturb or interfere with the
operations  conducted by Bright PCS of the Site in performing these  activities.
In no event shall SBA install or allow its  lessees,  sublessees,  licensees  or
other  entities  which are  granted  the right by SBA to occupy  the BTS Site to
install any  improvements  below, on or above the Ground Space. The Tower Space,
Ground Space,  Easements and Cable Path (as  hereinafter  defined) as to any BTS
Site may be collectively referred to herein as a "Site".

          (b) Subject to the terms and conditions of this MSA, SBA hereby agrees
to lease each of the Sites to Bright  PCS.  SBA  further  grants and  assigns to
Bright PCS the  non-exclusive  rights:  (i) to utilize  portions  of any utility
Easement for the installation and maintenance of utilities, cables, conduits and
pipes  for the  providing  of  necessary  utility  service  (including,  without
limitation, electrical and telecommunications service) to the Equipment; (ii) to
utilize the BTS Site  including any ingress and egress  easements for pedestrian
and  vehicular  access to and from the Site;  and (iii) to use a portion  of the
ground and space on the Tower to install  cabling and utilities  for  connecting
and linking the Tower Space with the Ground Space (the "Cable Path"). Bright PCS
shall be entitled to enter the Site on a twenty-four  (24) hour,  seven (7) days
per week basis during the SLA Term (as  hereinafter  defined).  Bright PCS shall
give SBA verbal  notice not less than  twenty  four hours  prior to a  scheduled
ascension  of a Tower by Bright PCS or its agents or  contractors.  In the event
that Bright PCS must ascend a Tower for exigent  circumstances  it shall provide
verbal notice of the ascension of the Tower within twenty fours (24) hours after
the tower was ascended.

          (c) Bright PCS shall have the  right,  without  paying any  additional
consideration to SBA, to install,  maintain,  operate, replace,  reconfigure and
upgrade  the  following  equipment  on each Site:  (i) one (1) six foot  (6'-0")
maximum  diameter  microwave  dish;  (ii) up to twelve (12) panel  antennas  and
associated tower top amplifiers and connection boxes,  jumper cabling and twelve
(12) - 1 5/8" coaxial  cables;  and (iii) a generator and a generator  fuel tank
provided  that Bright PCS shall obtain any  governmental  permits and  approvals
which are required for such  activities.  SBA  acknowledges  and agrees that the
microwave  dish  installed by Bright PCS on the Tower need not be located within
the Tower  Space,  provided  that,  in such event,  Bright PCS shall  locate the
microwave dish on the Tower so as not to adversely  affect the  installation  of
another carrier's equipment on the Tower and to avoid overloading the Tower when
considering  the  loads  in  existence  as of the  date of  installation  of the
microwave dish.

          (d) Bright PCS shall have the  right,  without  paving any  additional
consideration to SBA, to install,  maintain,  operate, replace,  reconfigure and
upgrade on each Site any  Equipment  which may be located  within  Ground  Space
which will not exceed two hundred  fifty (250)  square  feet.  In  addition,  if
necessary to handle  maximum  traffic  capacity,  Bright PCS shall also have the
right, without paying any additional consideration to SBA, to install, maintain,
operate,  replace,  reconfigure and upgrade on each Site  additional  electronic
equipment and related cabinetry within the Ground Space.

                                       2
<PAGE>

          (e)  The  equipment  and  items  specified  in  paragraph  2(c)  shall
hereafter  be referred to as the  "Equipment."  In no event shall  Bright PCS be
required to share the  Equipment  with SBA or any other  occupant of a Site as a
common  facility.  Bright PCS shall  maintain at its expense  the  Equipment  in
accordance with applicable laws, codes, ordinances and regulations.

          (f)  Bright  PCS may from time to time  during  the SLA Term  replace,
substitute  or modify any of the  Equipment.  Bright PCS must  submit  plans and
specifications  of the  replacement,  modification,  substitution  or additional
equipment.  SBA shall have the right to cause an intermodulation study, but only
if the  Equipment  is  operating  at a New  Spectrum  as that term is defined in
paragraph  6(a).  SBA shall have the right to cause a structural  analysis to be
performed  using such plans and  specifications,  at Bright  PCS's sole cost and
expense  but only in the event there  exists a  reasonable  likelihood  that the
windloading  or  structural  capacity  of the load  created by the  replacement,
modification,  substitution or additional equipment exceeds the loads created by
a full array of the Equipment.  The plans and specifications  will be subject to
SBA's  approval,  such  approval  not to be  unreasonably  withheld,  delayed or
conditioned.  The costs of any such intermodulation study or structural analysis
shall not exceed the market rates for said services. It will be unreasonable for
SBA to reject such plans and  specifications  if the equipment  described in the
plans (i) does not  increase  the wind load or  structural  burden upon the Site
above that which  would be created by a full array of the  Equipment,  (ii) does
not  increase the leased  Tower or ground  space,  and (iii) does not create any
technical or radio frequency interference which interferes with the equipment or
network of other users who are then located upon the Site.

          (g) SBA shall not enter  into any  lease,  sublease,  license or other
occupancy agreement (or any amendment or modification thereof) affecting the BTS
Site or the Tower or permit the  installation  of any equipment  that would have
the effect of (i) restricting or impairing Bright PCS's right to install and use
at any time during the SLA Term the full amount of the Equipment; (ii) violating
any federal,  state or local law,  regulation or ordinances;  or (iii) impairing
Bright PCS's access to the  Equipment.  In connection  with the  foregoing,  SBA
shall  require any  structural  report or analysis  obtained by SBA or any other
proposed  sublessee,  licensee  or other  occupant  of the Tower to  assume  and
incorporate  the  utilization of the full amount of the Equipment  regardless of
whether the full amount of the  Equipment  has been  installed as of the date of
the report or analysis.  In the event of a violation of this Paragraph 2(g) that
is not cured within  thirty (30) days after SBA's  receipt of written  notice of
such violation, Bright PCS may (without being obligated to do so and in addition
to,  and not in lieu of,  any other  remedy  available  to Bright PCS on account
thereof) seek the  enforcement of this Paragraph 2(g) against SBA and any entity
participating in such violation, including the seeking of equitable relief.

          (h) The Equipment  shall remain the  exclusive  property of Bright PCS
and  Bright  PCS  shall  have the  right to  remove  all or any  portion  of the
Equipment at any time during the SLA Term. Bright PCS shall remove the Equipment
from the Site  within  thirty  (30) days  after the  expiration  or any  earlier
termination of any SLA subject to any rights that SBA may have in and to certain

                                       3
<PAGE>
                                        [***] - CONFIDENTIAL TREATMENT REQUESTED

alterations  and  improvements  to the Site as set forth in this MSA. Bright PCS
shall  repair any damage  caused by such  removal.  In the event that Bright PCS
does not remove its Equipment from a Site on or before the expiration or earlier
termination of the applicable SLA, then Bright PCS shall pay as hold-over rental
for the period after the date of the  termination  or earlier  expiration of the
SLA a sum which is  equivalent  to [***] of the rental  rate which was  accruing
immediately  prior to the  expiration or termination of the applicable SLA which
amount shall be prorated through the date that the Equipment is removed from the
Site.

          (i) Bright PCS and its employees,  agents, consultants and contractors
shall be entitled to enter upon the BTS Site for purposes of accessing  the Site
subject to the notice requirements of paragraph 2(b) of this MSA. SBA shall have
the right to  approve  those  contractors  engaged  by Bright  PCS  before  said
contractors  enter a Site  provided  that the approval of any  contractor by SBA
shall not be  conditioned or  unreasonably  withheld or delayed by SBA and, once
such an approval has been given,  shall apply to all Sites which are governed by
this MSA.

     3. TERM.

          (a) MSA  Term.  The MSA term  shall  begin on the date of this MSA and
shall continue until the expiration or earlier termination of the last SLA which
remains subject to the terms of this MSA (the "MSA Term").

          (b) SLA Term and Renewal.  Subject to Paragraphs  3(c) and (d) of this
MSA,  the Initial SLA Term for BTS Sites shall be [***],  which term shall begin
on the earlier of the date which is (i) [***]  after the date that SBA  notifies
Bright PCS that the Tower is suitable for the  installation  of the Equipment or
(ii) the date at which Bright PCS commences the  installation  of the Equipment.
The date upon which each SLA  commences  may  hereinafter  be referred to as the
"SLA  Commencement  Date".  The  Initial  SLA  Term,  together  with any and all
renewals and extensions thereof, shall be defined as the "SLA Term".

          (c) Subject to Paragraph  3(d) hereof,  without regard to whether such
rights are or are not set forth in each SLA and further provided that Bright PCS
is not in default in the  payment of Rent beyond any  applicable  cure period at
the date of the  commencement  of the  Renewal  Term (as  hereinafter  defined),
Bright PCS shall have the right,  but not the obligation,  to extend any SLA for
[***] additional,  consecutive [***] year terms (each, a "Renewal Term"). Bright
PCS's  sublease of the Site during each  Renewal Term shall be on the same terms
and  conditions as set forth herein except with respect to rent and insurance as
otherwise set forth herein.  This MSA and each SLA shall automatically renew for
each successive Renewal Term unless Bright PCS notifies SBA in writing of Bright
PCS's  intention not to renew any such SLA at least sixty (60) days prior to the
expiration of the Initial SLA Term or the Renewal Term then in effect.

          (d) SBA hereby  covenants  and agrees that,  so long as Bright PCS has
not exercised its option to refrain from renewing an SLA, SBA shall exercise any
right to renew the  ground  lease  (or  refrain  from  effecting  a  non-renewal
thereof,  as the case may be) applicable to such Site ("Ground Lease") and shall

                                       4
<PAGE>

                                        [***] - CONFIDENTIAL TREATMENT REQUESTED

not exercise any right of  termination of such Ground Lease (except as otherwise
provided  under this MSA) so that such Ground Lease shall continue in full force
and effect  during the Initial Term and all Renewal Terms  available  under such
SLA. Without in any way modifying SBA's obligation to renew each Ground Lease as
described  above,  the SLA Term of any SLA  shall  not  extend  beyond  the term
(including  any renewals  thereof) of the Ground Lease  applicable  to such Site
and,  simultaneously  with the  expiration or earlier  termination of the Ground
Lease in accordance  with its terms,  the applicable  SLA shall also  terminate;
provided, however, that the foregoing shall not be deemed or construed to modify
or limit any of Bright  PCS's  rights of  nondisturbance  or of cure  under such
Ground  Lease or under any other  agreement  with the lessor  under such  Ground
Lease ("Ground  Lessor").  In the event that SBA and the Ground Lessor hereafter
enter into any further  extensions  or renewals of the Ground  Lease,  SBA shall
provide  written  notice  thereof to Bright PCS within  thirty  (30) days of the
execution thereof.

     4. RENT.

          (a)  Sites; Initial Term and Renewal Term.

               (i) During the Initial SLA Term, Bright PCS shall pay annual rent
for each SLA at such place as SBA may specify in writing to Bright PCS from time
to time the sum of [***] in equal  monthly  installments  in the amount of [***]
per month, in advance ("Rent"). The first monthly payment for each Site shall be
due on the SLA  Commencement  Date for such  Site.  Rent for any  partial  month
during the SLA Term or any renewal or  extension  thereof  shall be prorated and
payable  according to the actual number of days in the calendar  month for which
such determination of Rent is to be made.

               (ii)  Rent  Escalation.  On the  third  anniversary  of  the  SLA
Commencement Date for each BTS Site, and on each anniversary of the Commencement
Date for said Sites thereafter throughout the Initial Term and any Renewal Term,
[***].
          (b)  Bright PCS shall  have the right to use a direct  deposit  system
with  regard to Rent  payments.  SBA  agrees to  cooperate  with  Bright  PCS in
providing  requisite  information  to Bright PCS for such  direct  deposit.  The
implementation of the direct deposit process shall be at Bright PCS's expense.

     5. PERMITTED USE.  Bright PCS may use each Site for: (1) the  transmission,
relay and receipt of communication  signals utilizing any lawful frequencies via
the  Equipment,  (ii)  the  construction,   alteration,   maintenance,   repair,
replacement  and  relocation of the  Equipment in accordance  with the terms and
provisions  of this MSA and  (iii)  any  other  incidental  lawful  purposes  in
accordance with the terms and conditions hereof.

                                       5
<PAGE>

     6. INTERFERENCE.

          (a) Bright  PCS's use of each Site as  permitted  in  accordance  with
Paragraph 5 for the installation  and operation of the Equipment  (including any
microwave  dishes  installed  and  operated by Bright PCS  pursuant to Paragraph
2(c)) shall  constitute  the "Senior Use" on the BTS Site.  The Senior Use shall
further include any use or uses by substitute,  modified or replacement antennas
that are  installed  within the Tower Space on account of damage,  disrepair  or
obsolescence of any of the antennas  described above or failure of such antennas
to yield optimum performance,  even if such substitute,  modified or replacement
antennas are of a different model or manufacturer.  Bright PCS's use of the Site
for the Senior Use shall be deemed for all purposes the  senior-in-priority  use
of the  BTS  Site.  It is  understood  that  should  the  Equipment  operate  at
frequencies  different  from the  frequencies  than those  which  Bright PCS has
authority  to  utilize  ("New  Spectrum")  as of the Date of this MSA the use of
those  frequencies  shall  not be a  Senior  Use for the  purpose  of  resolving
interference  with the then  existing  uses at that  Site.  Notwithstanding  the
foregoing,  if Bright PCS shall begin the operation of frequencies pursuant to a
New Spectrum,  the use of the New Spectrum shall thereafter  constitute a Senior
Use  relative  to any use of the BTS  Site  which  commences  after  the date of
commencement of use of the New Spectrum.  If the equipment which is operating at
the New Spectrum causes interference with the then existing equipment at the BTS
Site and such  interference  cannot be eliminated  within five (5) business days
after receipt by Bright PCS of notice from SBA of the existence of interference,
Bright PCS shall cease the operation of the Equipment  which is operating at the
New Spectrum and is causing interference (except for intermittent  operation for
the purpose of testing,  after  performing  maintenance,  repair,  modification,
replacement,   or  other  action  taken  for  the  purpose  of  correcting  such
interference) until such interference is corrected.

          (b) In the event that, as to any Site leased to Bright PCS pursuant to
an SLA, SBA enters into any lease,  sublease or license  agreement in the future
with any third party for other  portions of the BTS Site or the Tower,  then SBA
agrees to require  such lessee,  sublessee  or licensee to install  equipment of
types and operating at radio  frequencies  that will not cause  interference  to
Bright PCS's communications operations being conducted from the Site. SBA agrees
that in the event such lessee,  sublessee or licensee causes  interference  with
the  Equipment,  SBA will require  such  sublessee or licensee to take all steps
necessary  to correct  and  eliminate  the  interference.  SBA will  notify such
lessee, sublessee or licensee of such interference within 24-hours of receipt of
such notice from Bright PCS. If such  interference  cannot be eliminated  within
five (5)  business  days after  receipt by such  sublessee or licensee of notice
from  SBA of the  existence  of  interference,  SBA  shall  cause  such  lessee,
sublessee  or  licensee  to  disconnect  the  electric  power and shut down such
lessee's, sublessee's or licensee's equipment (except for intermittent operation
for the purpose of testing, after performing maintenance,  repair, modification,
replacement,   or  other  action  taken  for  the  purpose  of  correcting  such
interference) until such interference is corrected.  If such interference is not
completely  rectified to the  satisfaction  of Bright PCS within sixty (60) days
after receipt by such lessee, sublessee or licensee of such notice from SBA, SBA
shall  cause such  lessee,  sublessee  or licensee  to remove its  antennas  and
equipment from the BTS Site and the Tower.

                                       6
<PAGE>

     7. UTILITIES.

          (a) Use by Bright PCS.  Bright PCS shall pay the cost of all  electric
power,  telephone and other utility service  consumed by Bright PCS in operating
the Equipment and shall make payment therefor when due directly to the providing
utility or service  company before any lien,  fine,  penalty,  interest or other
charge may attach on account of nonpayment.

          (b) Use by SBA and  Others.  Except  for the cost of  electric  power,
telephone  and other  utility  service  consumed by Bright PCS in operating  the
Equipment,  SBA  shall  pay or cause to be paid  the cost of all  utilities  and
services  utilized on the BTS Site directly to the providing  utility or service
company before any lien, fine,  penalty,  interest or other charge may attach on
account  of  nonpayment.  SBA shall  not nor  shall it allow any third  party to
sub-meter  electricity  at any Site from  Bright  PCS.  SBA and any third  party
granted a right to use the BTS Site or a portion  thereof in accordance with the
terms of this MSA may connect to the utility  improvements  which serve the Site
provided that said utilities  shall (i) be separately  metered from Bright PCS's
utilities, (ii) not cause an undue loading on the electrical service when taking
into  consideration  the electrical load created by the Equipment which has been
or may be  installed  at the Site by Bright  PCS and (iii) be  installed  on the
secondary side of the utility  transformer which provides  electrical service to
the Site.

     8. GROUND LEASE DEFAULT; BRIGHT PCS'S RIGHT TO CURE. Upon the occurrence of
a Monetary  or  Non-Monetary,  Ground  Lease  Default,  as  hereinafter  defined
(collectively,  "Ground Lease  Defaults")  and without  limiting or  restricting
Bright PCS's rights or remedies under Paragraphs 9, 10 and 11 hereof, Bright PCS
shall be authorized  to exercise the remedies set forth below in this  Paragraph
8:

          (a) In the case of a default in the payment of rent due under a Ground
Lease or a default in any other obligation  imposed upon SBA as lessee under the
Ground  Lease the cure of which can be reduced to the payment of a monetary  sum
(a "Monetary  Ground Lease  Default"),  Bright PCS may, within or outside of any
cure period  provided  therefor  in the Ground  Lease or  otherwise  afforded to
Bright PCS by an agreement with the Ground Lessor,  pay to the ground lessor any
amount  required  under the Ground Lease to cure such default so that the Ground
Lease shall remain in full force and effect, including,  without limitation, any
interest,  late charge or other assessment  charged or assessed by Ground Lessor
with respect  thereto.  Bright PCS shall  provide to SBA written  notice of such
action at or before  the time of making  the  foregoing  payment  to the  Ground
Lessor.  SBA shall  have a period of ten (10) days from the date of  receipt  of
said notice from Bright PCS to cure said default  before Bright PCS may affect a
cure  pursuant  and demand an offset  against Rent  pursuant to this  paragraph.
Following any such payment by Bright PCS to Ground  Lessor,  Bright PCS shall be
entitled to withhold the full amount thereof, plus an additional  administrative
charge of five percent (5%) of the amount paid,  from  installments of Rent next
owing under any such SLA until such amount and charge have been fully  credited.
In connection therewith, the parties hereby acknowledge that such administrative
charges  are  intended  to  compensate  Bright  PCS for its  administrative  and
additional  overhead  costs,  fees  and  expenses  reasonably   anticipated  and
estimated  to be incurred  on account of such action and are not  intended to be
imposed as a penalty.

                                       7
<PAGE>

          (b) In the case of a  default  under a Ground  Lease the cure of which
cannot be reduced to the payment of a monetary sum  ("Non-Monetary  Ground Lease
Default"),  Bright  PCS may,  upon  written  notice to SBA  (except  in cases of
emergency  whereby  Bright PCS shall provide such notice as promptly as possible
after the fact),  commence and prosecute any and all action or actions necessary
to cure such default as may be  available to SBA under the terms and  conditions
of such Ground Lease.  SBA shall have a period of ten (10) days from the date of
receipt of said notice from Bright PCS to cure said  default  before  Bright PCS
may affect a cure  pursuant and demand an offset  against Rent  pursuant to this
paragraph.  In the event of any such curative  action by Bright PCS described in
this Paragraph 8(b), Bright PCS shall be entitled to withhold the full amount of
all costs and expenses  incurred by Bright PCS in completing  such cure, plus an
additional  administrative  charge of five  percent  (5%) of such  amount,  from
installments of Rent next owing under this MSA until such amount and charge have
been fully credited.

          (c) In the  event  that  Bright  PCS  effects  a cure of a breach of a
Ground Lease by SBA as provided herein, Bright PCS may, at its election, require
SBA to assign the Ground Lease to Bright PCS and effect an Acquisition  pursuant
to the terms of paragraph 9 hereof.

     9. OTHER DEFAULTS BY SBA; ADDITIONAL BRIGHT PCS REMEDIES.

          (a) The following shall constitute  events of default under any SLA by
SBA:

               (i) Breach of any representation,  warranty or covenant set forth
in this MSA including the applicable SLA (with the exception of the interference
provisions  set forth in Paragraph 6) which is not cured within thirty (30) days
of receipt of written  notice,  or such shorter time as may be specified by this
MSA or the applicable Ground Lease,  except such cure period will be extended as
reasonably necessary to permit SBA to complete the cure so long as SBA commences
the cure within such thirty (30) day period,  or other  applicable  period,  and
thereafter continuously and diligently pursues and completes such cure;

               (ii) If any  petition  is  filed by or  against  SBA,  under  any
paragraph  or chapter of the present or any future  federal  Bankruptcy  Code or
under any similar law or statute of the United  States or any state thereof (and
with respect to any petition  filed  against SBA, such petition is not dismissed
within ninety (90) days after the filing thereof),  or SBA is adjudged  bankrupt
in proceedings filed under any paragraph or chapter of the present or any future
Bankruptcy Code or under any similar law, or statute of the United States or any
state thereof.

               (iii) If a receiver, custodian or trustee is appointed for SBA or
for  substantially  all of the assets of SBA and such appointment is not vacated
within sixty (60) days of the date of appointment; or

               (iv) If SBA makes a transfer in fraud of creditors.

                                       8
<PAGE>

          (b) Upon the  occurrence  of any  default by SBA under this MSA or any
Ground Lease  Default,  Bright PCS shall be entitled to exercise any one or more
of the  following  rights or remedies in  accordance  with,  and subject to, the
terms, provisions and conditions of this MSA:

               (i) in the case of a default  of this MSA  resulting  from  SBA's
failure to renew the Ground Lease as required under Paragraph 3(d) hereof Bright
PCS shall have the right to take all necessary and appropriate steps to effect a
renewal thereof;

               (ii) in the event of a breach  or an  alleged  default  under the
Ground Lease by SBA which is not cured
within  five (5) days prior to the date that period to cure  defaults  under the
Ground  Lease  expires  or if SBA shall fail to  properly  effect a renewal of a
Ground Lease,  then Bright PCS may upon written notice to SBA,  acquire from SBA
all of SBA's  rights,  title,  benefits,  interests  and  obligations  under the
applicable  Ground  Lease  (hereinafter  referred  to  as an  "Acquisition")  in
accordance with the provisions of Paragraphs 9(c) and 9(d) hereof,  whereupon at
the completion of the Closing (as hereinafter  defined) of such  Acquisition the
applicable SLA shall terminate;

               (iii) upon written notice to SBA, terminate the applicable SLA(s)
without exercising its right of Acquisition,  whereupon Bright PCS shall have no
further liability to SBA hereunder with regard to any such SLA(s); and

               (iv) with or without  terminating  the applicable SLA, pursue any
and all other remedies available hereunder or under applicable law or in equity.

          (c) In the event that Bright PCS elects to exercise its right to cause
an Acquisition, the improvements on the Site which were constructed and owned by
SBA ("SBA Improvements"), including, without limitation, the Tower, any concrete
foundations,  and any utilities structures or other improvements owned by SBA on
the BTS Site shall be  bargained,  sold and conveyed to Bright PCS at a purchase
price equal to the fair market  value of such  improvements  after  disassembly,
less any  dismantling  and  moving  expenses  and less the amount of any debt or
obligation  encumbering or secured by such SBA  Improvements.  Nothing contained
herein shall be deemed to grant SBA the right to encumber  the SBA  Improvements
except as otherwise provided in this MSA.

          (d) The closing of the Acquisition  (the "Closing") shall occur within
thirty (30) days after SBA's  receipt of Bright PCS's notice of exercise of such
right.  During the aforementioned  period prior to Closing,  Bright PCS shall be
entitled (but shall not be obligated) to take all measures necessary to maintain
each Ground Lease in full force and effect,  including  the exercise of the cure
remedies  described above in Paragraph 8 hereof,  provided,  however,  that such
right shall not relieve SBA of its primary  responsibilities  in respect of each
Ground  Lease.  SBA agrees to deliver to Bright PCS  originals  or copies of any
other  existing  leases,  subleases and licenses  affecting the BTS Site. At the
Closing,  (i)  Bright  PCS  shall  pay to SBA  the  purchase  price  for the SBA
Improvements to be conveyed to Bright PCS under this Paragraph 9; (ii) SBA shall

                                       9
<PAGE>

execute  and deliver to Bright PCS a bill of sale  without  recourse to such SBA
Improvements;  (iii) SBA and Bright PCS shall  execute and deliver an assignment
and  assumption  without  recourse of each Ground Lease and of existing  leases,
subleases and licenses  consistent  with the terms and  conditions  hereof and a
termination  agreement providing for the termination of the applicable SLA as of
the date of the Closing; and (iv) any and all other deeds, instruments and other
writings as may be  reasonably  required  by Bright PCS or its title  insurer to
effect the Acquisition or procure title insurance to the BTS Site.

          (e) SBA shall  indemnify and hold Bright PCS harmless from and against
any  claims,  actions,   injuries,   losses  or  damages  (including  reasonable
attorneys'  fees and court costs)  suffered or incurred by Bright PCS on account
of SBA's actions or omissions  under or with respect to the Ground Lease and any
assigned  subleases  and  licenses  with any third party  prior to the  Closing.
Bright PCS shall  indemnify  and hold SBA harmless  from and against any claims,
actions,  injuries,  losses or damages (including reasonable attorneys' fees and
court costs)  suffered or incurred by SBA on account of Bright PCS's  actions or
omissions  under or with respect to the Ground Lease and the assigned  subleases
and licenses with any third party after the Closing. The respective  obligations
of SBA and Bright PCS under this  Paragraph  9(e) shall  survive the Closing and
the termination of the applicable SLA.

          (f) In no event shall an event of default under one SLA  constitute an
event of default  under any other SLA or  entitle  Bright  PCS to  exercise  any
remedies in relation to any Site other than the Site which is the subject of the
event of  default;  provided,  however,  that  Bright PCS shall be  entitled  to
exercise any setoff  rights it may possess  against SBA,  whether  arising under
this MSA or by operation of law, against any SLA.

     10.  BRIGHT  PCS'S  DEFAULT.  The  occurrence  of any  one or  more  of the
following events constitutes an "event of default" by Bright PCS under any SLA:

          (a) If Bright PCS fails to pay Rent  within  ten days of Bright  PCS's
receipt of written request for payment;

          (b) Breach of any  representation,  warranty or covenant  set forth in
this MSA including any SLA, with the exception of the  non-payment of any fee or
other sums by Bright PCS,  which is not cured within thirty (30) days of receipt
of written  notice or such shorter time as may be specified by this MSA,  except
such thirty (30) day cure period  will be extended as  reasonably  necessary  to
permit  Bright PCS to complete the cure so long as Bright PCS commences the cure
within such thirty (30) day period and  thereafter  continuously  and diligently
pursues and completes such cure;

          (c) If any  petition  is filed by or  against  Bright  PCS,  under any
paragraph  or chapter of the present or any future  federal  Bankruptcy  Code or
under any similar law or statute of the United  States or any state thereof (and
with respect to any petition  filed  against  Bright PCS,  such  petition is not
dismissed  within ninety (90) days after the filing  thereof),  or Bright PCS is
adjudged  bankrupt in  proceedings  filed under any  paragraph or chapter of the
present or any future Bankruptcy Code or under any similar law or statute of the
United States or any state thereof,

                                       10
<PAGE>

          (d) If a receiver, custodian or trustee is appointed for Bright PCS or
for any of the assets of Bright PCS and such  appointment  is not vacated within
sixty (60) days of the date of appointment; or

          (e) If Bright PCS makes a transfer in fraud of creditors.

     11.  SBA'S  REMEDIES.  If an event of  default by Bright  PCS  occurs,  SBA
(without notice or demand except as expressly  required above) may terminate the
applicable SLA. Bright PCS will become liable for damages equal to the total of:

          (a) The actual,  reasonable  costs of recovering  the Site which is in
default, including reasonable attorneys' fees;

          (b) The Rents accrued and payable as of the date of termination,  plus
interest thereon from the date due until paid; and

          (c) the Rent  reserved for the remainder of the then existing SLA Term
as such Rents would ordinarily become due and payable.

          (d) If Bright  PCS does not cure an actual  default  within the period
available to cure a default,  SBA may cure the default and demand  reimbursement
from Bright PCS of those reasonable  expenditures made by Bright PCS to cure any
such default. Following any such payment by SBA, SBA shall be entitled to demand
reimbursement  from Bright PCS of the full amount  thereof,  plus an  additional
administrative  charge of five percent (5%) of the amount  paid.  In  connection
therewith,  the parties hereby acknowledge that such administrative  charges are
intended to compensate SBA for its administrative and additional overhead costs,
fees and expenses reasonably anticipated and estimated to be incurred on account
of such action and are not intended to be imposed as a penalty.

     In no event shall SBA be entitled to accelerate Rents due under any SLA. In
no event shall an event of default under one SLA  constitute an event of default
under any other SLA or entitle SBA to exercise  any  remedies in relation to any
Site other than the Site which is the subject of the event of default  provided,
however, that SBA shall be entitled to exercise any setoff rights it may possess
against  Bright PCS,  whether  arising  under this MSA or by  operation  of law,
against any SLA.

     12.  TERMINATION  RIGHTS OF BRIGHT PCS. In addition to, and not in lieu of,
any other rights of termination set forth herein,  Bright PCS may on one or more
occasions terminate any SLA without any penalty or further liability as follows:

          (a) during any Renewal  Term upon not less than sixty (60) days' prior
written  notice  to  SBA  if,  notwithstanding  the  exercise  of  Bright  PCS's
reasonable,  diligent and good faith efforts,  Bright PCS is unable to obtain or
maintain the FCC license or other  governmental  approval or permit  required to
continue to utilize the Site in the manner then currently utilized;

                                       11
<PAGE>

          (b) upon not less than thirty (30) days' prior  written  notice to SBA
if, through no fault of Bright PCS, SBA may no longer  lawfully  operate the SBA
Improvements  as a wireless  communications  facility or may no longer  lawfully
maintain the Tower on the BTS Site;

          (c) upon not less than thirty (30) days' prior  written  notice to SBA
if Bright PCS determines,  in its reasonable discretion exercised in good faith,
that the BTS Site has  experienced  or  suffered,  or hereafter  experiences  or
suffers,  an environmental  contamination or other hazardous  substance  release
through  no fault of  Bright  PCS that  was not  disclosed  in an  environmental
assessment provided to Bright PCS prior to the execution of the SLA;

          (d) upon not less than six (6) months' prior written notice to SBA for
no reason or any reason at all after the expiration of the Initial Term.

     In the event that Bright PCS  terminates  the SLA for any Site  pursuant to
this  Paragraph 12,  Bright PCS shall,  upon such  termination,  effect a timely
removal  of its  Equipment  and  transfer  to SBA all of its  right,  title  and
interest, without representation or warranty, to any concrete foundations, tower
mounting platforms, power poles, utility service entrance equipment, cabling and
conduit remaining at such Site.

     13. ADDITIONAL WARRANTIES AND COVENANTS.  So long as this MSA is in effect,
SBA hereby further covenants, warrants and agrees as follows:

          (a) SBA shall not exercise any right of  termination  available to SBA
as the tenant  under any Ground Lease except in a Renewal Term and may only then
exercise a right to terminate  the Ground Lease if SBA  exercises  such right to
protect safety or property or SBA reasonably  believes that continued leasing of
the Site will  cause or has  caused SBA to incur  liability  exceeding  the fair
market value of the Site. SBA may not exercise this termination right unless SBA
gives Bright PCS at least 30 days notice.  This notice shall give Bright PCS the
right to cause an  Acquisition  of the Site as described in Paragraphs  9(c) and
(d) of this  MSA.  Bright  PCS must  accept  the offer  within  ten (10) days of
receipt of the  notice.  If SBA fails to receive a response  within the ten (10)
day period,  Bright PCS will be deemed to have rejected the offer,  and SBA will
have the right to terminate the Ground  Lease.  If Bright PCS accepts the offer,
an Acquisition  will occur as described in Paragraphs  9(c) and (d) of this MSA.
Without limiting the generality of the foregoing, in the event of any bankruptcy
filing or other  insolvency  proceeding  by or  against  SBA in which the Ground
Lease is rejected,  or sought to be rejected,  by SBA or SBA's  trustee or other
representative of SBA's bankruptcy  estate,  SBA shall invoke any and all rights
under 11 U.S.C. ss. 365(h) or any other  applicable  provision (or any successor
provision)  to continue  SBA's  occupancy of the BTS Site so as to permit Bright
PCS's continued occupancy and use of the Site as authorized herein;

          (b) SBA shall duly and punctually perform each and every obligation of
the  "Lessee"  under (and as defined in) the Ground Lease and shall not cause or
permit  the  occurrence  of any  event of  default  on the part of the  "Lessee"
thereunder;

                                       12
<PAGE>

          (c) SBA shall not surrender, or offer to surrender,  any BTS Site to a
Ground Lessor;

          (d) SBA shall not enter  into any  amendment  of a Ground  Lease  that
would adversely  affect any right or remedy of Bright PCS hereunder or under the
applicable SLA;

          (e) In the event of Ground  Lessor's  failure  to observe or perform a
warranty or covenant of such Ground  Lessor  under the  applicable  Ground Lease
which has an adverse  affect upon Bright  PCS's  permitted  use or Bright  PCS's
governmental  permits,  SBA shall use diligent and good faith  efforts to compel
Ground Lessor's observance or performance of such warranty or covenant;

          (f) As promptly  as possible  upon SBA's  receipt  thereof,  SBA shall
provide to Bright PCS a copy of any  notice of default  received  by SBA under a
Ground Lease; any notice of a bankruptcy,  receivership or other insolvency case
or  proceeding  affecting  a  Ground  Lessor  or a BTS  Site;  and  any  notice,
complaint,  order or decree  affecting,  or seeking  to affect,  the status of a
Tower or the operation of a BTS Site as a wireless  communications  facility. In
the event that SBA  provides to a Ground  Lessor any notice of a default by such
Ground Lessor under the Ground Lease, SBA shall simultaneously provide a copy of
such notice to Bright  PCS.  SBA will not  terminate a Ground  Lease due to such
default by a Ground  Lessor  except  during a Renewal  Term and only then if SBA
first  offers to assign such Ground  Lease to Bright PCS, in which event  Bright
PCS shall have the right to take an  assignment of the Ground Lease and to cause
an  Acquisition.  Bright PCS shall provide notice to SBA of the intent of Bright
PCS to accept an  assignment  of a Ground Lease within ten (10) days of the date
that  Bright PCS  receives a notice of such an event  from SBA.  The  failure of
Bright  PCS to tender  said  notice to SBA within ten (10) days of the date that
Bright PCS receives a notice of such an event from SBA shall constitute a waiver
of Bright PCS's right to accept an assignment of the Ground Lease;

          (g) SBA shall not  authorize,  permit or allow any third  party to use
any portion of a BTS Site in violation of applicable laws, regulations, codes or
ordinances  (including,  without  limitation,  any legal requirements  governing
radio frequency emissions) or in violation of the applicable Ground Lease; and

          (h) SBA  shall  maintain  at its  expense  the Tower and any other SBA
improvements  on the  BTS  Site  in  accordance  with  applicable  laws,  codes,
ordinances and regulations, including any applicable lighting, painting or other
marking  requirements.  In the  event  that  a  Tower  is  subject  to  lighting
requirements under any applicable laws,  ordinances,  codes or regulations,  SBA
shall  maintain an alarm system to monitor the operation of such  lighting,  and
Bright PCS may install at its expense a tie-in monitor or alarm to inform Bright
PCS of the operation of such lighting.  SBA shall  indemnify and hold Bright PCS
harmless   from  and  against  any  actions,   claims,   proceedings,   damages,
liabilities,  fees,  fines,  expenses and other  losses  suffered or incurred by
Bright PCS in connection with the tower lighting system,  except such matters as
may have  been  suffered  or  incurred  solely as the  result  of  Bright  PCS's
negligence or willful misconduct. Notwithstanding the foregoing, the maintenance
of the tower lighting system shall be the responsibility of SBA immediately upon
the  execution of such SLA. In the event that Bright PCS  discovers  that one or

                                       13
<PAGE>

more  lighting  systems  which  are  required  by any  governmental  agency  are
malfunctioning,  Bright PCS shall notify SBA at the following  telephone number,
which  number  shall  be  monitored  by  SBA 24  hours  a  day,  7 days a  week:
1-888-950-7483  (SITE). Bright PCS shall be entitled to take any action which it
deems  reasonably  necessary,  including  repairing such lighting  system and/or
notifying the FAA, FCC or any other  governmental  agency  without any liability
whatsoever  to SBA for such  actions  if SBA  fails  to  follow  the  applicable
government  procedures  beyond  applicable  notice and grace periods.  SBA shall
maintain each Tower in good condition and repair.

          (i) SBA does hereby  agree to  indemnify  and hold Bright PCS harmless
from any and all losses,  damages,  fines,  penalties or costs of any kind which
may arise from the improper design, maintenance or operation of a Tower or tower
lighting systems,  or which may be imposed by the FAA, FCC or any other federal,
state or local agency arising from the improper design, maintenance or operation
of a Tower or tower  lighting  systems unless arising from Bright PCS's actions.
Should Bright PCS be cited because a Site is not in compliance  through no fault
of Bright  PCS and,  should  SBA fail to cure the  conditions  of  noncompliance
within  the  time to cure  the  non-compliance  as  required  by the  applicable
governmental  agencies,  Bright PCS may either  terminate the applicable SLA or,
with prior  written  notice from Bright PCS to SBA and allowing SBA a reasonable
opportunity to cure,  proceed to cure the conditions of  noncompliance  at SBA's
expense.  Amounts  of  all  reasonable  expenses  to  cure  such  conditions  of
non-compliance,  together with any such fine or citation paid by Bright PCS, may
be deducted by Bright PCS from the Rent.

          (j)  If  antenna  power  output  ("RF  Emissions")  are  presently  or
hereafter become subject to any restrictions imposed by the FCC for RF Emissions
standards on Maximum Permissible  Exposure ("MPE"), or if the Tower otherwise is
or becomes subject to federal, state or local rules,  regulations,  restrictions
or  ordinances,  Bright PCS shall  comply  with SBA's  reasonable  requests  for
modifications  to Bright PCS's Equipment which are reasonably  necessary for SBA
to  comply.  SBA  shall  take all  measures  to ensure  that all other  lessees,
sublessees  and  licensees  comply,  with  such  limits,   rules,   regulations,
restrictions or ordinances. The RF Emissions requirements of Bright PCS shall be
superior to the  requirements of any other occupants of the BTS Site,  provided,
however, that in no event shall Bright PCS's RF Emissions exceed any limitations
imposed by the FCC for the operation of equipment by a single, PCS or comparable
tenant.  If an engineering  evaluation or other power density study be performed
to evaluate RF Emissions compliance with MPE limits is required under applicable
law, SBA or other  lessees  shall bear all costs of such an evaluation or study.
If said study indicates that RF Emissions at the facility do not comply with MPE
limits, then SBA and all of SBA's other lessees,  licensees and sublessees shall
immediately  take any steps  necessary to ensure that they are  individually  in
compliance  with such  limits  and  shall  cease or  reduce  operations  until a
maintenance  program or other  mitigating  measures can be implemented to comply
with MPE.  At SBA's  request,  Bright PCS shall  provide to SBA  technical  data
necessary for routine calculations of MPE compliance, including, but not limited
to, TPO gains, losses and operating frequencies.

                                       14
<PAGE>

          (k) SBA at its sole cost and  expense,  except if such cost or expense
arises out of a  negligent  or  wrongful  act or  omission  of Bright PCS or its
contractors,  shall monitor, maintain and repair each Tower such that Bright PCS
may  utilize  such Tower for the use  permitted  under  Paragraph 5 of this MSA,
including, without limitation,  lighting systems and markings and the structural
integrity of each. Tower installation,  maintenance and repair of the Tower must
comply  with all laws  applied in a manner  consistent  with  standard  industry
practices except for minor  noncompliance that do not affect Bright PCS's rights
and privileges under this MSA.

     14. RELOCATION.

          (a) Following  the date of this MSA,  Bright PCS shall have the right,
at Bright PCS's sole cost and  expense,  to relocate the Tower Space at any Site
to another  location on the Tower (the "Relocated  Tower Space"),  provided that
Bright PCS must first obtain SBA's prior  written  consent,  which consent shall
not be unreasonably conditioned, delayed or withheld.

          (b) Following  any such  relocation,  the Relocated  Tower Space shall
thereafter be deemed the "Tower  Space" for all purposes  under this MSA and the
applicable SLA, shall be leased to and occupied by Bright PCS in accordance with
the terms and  conditions  of this MSA, and this MSA and the SLA shall be deemed
amended  accordingly.  Bright  PCS's  obligations  to pay  any  expense  or cost
incurred on account of such  relocation  shall survive any  expiration or sooner
termination of this MSA.

     15.  FINANCING  MATTERS.  SBA hereby  represents,  covenants  and agrees as
follows:

          (a) SBA  shall not  grant,  convey  or cause to  attach  any  security
interest  in, to or  against  any of SBA's  interest  or title  under any of the
Ground Lease,  SBA's interest or title under any SLA, this MSA, any of the Tower
or any of the other SBA Improvements  unless, and this MSA and the SLAs shall be
subordinate  to the  Security  Interest  if, the  grantee  or holder  thereof (a
"Secured   Party")   and  SBA  duly   execute   and  deliver  to  Bright  PCS  a
non-disturbance  and attornment  agreement  ("NDA") in a form  substantially the
same as that attached hereto as Attachment "B".

          (b) Except for the  attachment  of a Security  Interest  as  permitted
under  Paragraph  15 (a) of this MSA,  SBA shall not at any time during the Term
permit or allow  the  filing or other  attachment  of any lien,  charge or other
encumbrance against the Site, the BTS Site, the Tower, or other SBA Improvements
on account of its work with respect  thereto (other than liens that are inchoate
or otherwise  attach by operation of law and  subsequently  accrue or secure the
payment of a subsequently accruing obligation,  but in all events subject to the
requirement  to  discharge  same as provided in the next  sentence  hereof),  or
otherwise  during the SLA Term on account of SBA's acts or omissions or the acts
or omissions of its  lessees,  sublessees  or  licensees.  Without  limiting the
foregoing, SBA shall discharge of record, whether by bond, payment or otherwise,
any such lien,  charge or encumbrance  prohibited under this Paragraph 15 within
thirty  (30) days  after  receipt of actual  notice of the filing or  attachment
thereof.

                                       15
<PAGE>

          (c) Bright PCS shall not at  anytime  during the Term  permit or allow
the filing or other  attachment of any involuntary  lien,  charge or encumbrance
against the Equipment,  Site,  the BTS Site,  the Tower,  any SLA or this MSA on
account of its work with respect  thereto (other than liens that are inchoate or
otherwise  attached by  operation of law and  subsequently  accrue or secure the
payment of the subsequently  accruing  obligation,  but in all events subject to
the requirement to discharge same as provided in the next sentence  hereof),  or
otherwise during the Term on account of Bright PCS's acts or omissions.  Without
limiting the foregoing,  Bright PCS shall discharge of record,  whether by bond,
payment or otherwise,  any such lien,  charge,  or encumbrance  prohibited under
this  Paragraph 15 within thirty (30) days after receipt of actual notice of the
filing or attachment thereof.

     16. CASUALTY AND  CONDEMNATION.  If the whole or any substantial  part of a
Site shall be taken by any public authority under the power of eminent domain so
as to interfere  with Bright PCS's use and occupancy  thereof,  then the term of
the applicable SLA shall cease on the part so taken on the date of possession by
such  authority of that part, and any unearned Rent paid in advance of such date
shall  be  refunded  by SBA to  Bright  PCS  within  thirty  (30)  days  of such
possession,  and Bright PCS shall have the right to terminate the applicable SLA
upon written notice to SBA, which notice shall be delivered by Bright PCS within
thirty  (30) days  following  the date  notice is received by Bright PCS of such
taking or possession. If Bright PCS chooses not to terminate the applicable SLA,
the Rent shall be reduced or abated in  proportion  to the actual  reduction  or
abatement  of Bright  PCS's use of the Site.  If all or a portion of the Site is
destroyed, rendering the Site unusable, Rent will be suspended until the Site is
restored.  SBA shall have a period of one hundred  twenty  (120) days to restore
the Site. If the  restoration  is not completed  within one hundred twenty (120)
days, then Bright PCS shall have the right to terminate the applicable SLA.

     17. TAXES.

          (a)  Bright  PCS shall pay,  on or before  the due date  thereof,  all
personal  property  taxes  levied  against the  Equipment  and all taxes  levied
against the Rent except for income taxes  payable by SBA. If the assessed  value
of the BTS Site is increased by inclusion of the Equipment and SBA is liable for
the payment of such increase in taxes,  then Bright PCS shall pay to SBA, within
thirty  (30) days after  receiving  a written  request  for  payment or at least
fifteen (15) days prior to the due date of such taxes (whichever is later),  the
part of such increase in taxes specifically attributable to the inclusion of the
Equipment.  As a condition of such  payment,  SBA shall provide to Bright PCS an
original or copy of the tax assessment or other taxing  authority  documentation
evidencing such increase on account of the Equipment.

          (b) SBA  shall  pay or  cause to be paid,  on or  before  the due date
thereof,  personal  property taxes levied against the Tower and SBA improvements
and all real  property  taxes for which SBA is liable  under the Ground Lease or
applicable law.

                                       16
<PAGE>

     18. INSURANCE AND SUBROGATION.

          (a) SBA and Bright PCS shall each provide and maintain during the Term
commercial  general  liability  insurance in an aggregate  amount of Two Million
Dollars  ($2,000,000)  per site and name the other party hereto as an additional
insured on such policy or policies.  Each party may satisfy this  requirement by
obtaining  appropriate  endorsements to any master policy of liability insurance
maintained by such party. In no event shall the deductible  under either party's
policy of commercial general liability  insurance exceed Ten Thousand and No/100
Dollars ($10,000.00).  The policy amount set forth in this Paragraph 18(a) shall
be reset on every  fifth  anniversary  of the Date of this MSA to  increase by a
commercially  reasonable  amount but not more than 115% of the policy amount set
during the preceding  five (5) year period.  The parties shall also maintain any
other insurance required by law, including workers' compensation insurance.

          (b) To the  extent  permitted  under  both of the  parties'  insurance
policies,  neither  party  shall  be  liable  to the  other  (or to the  other's
successors or assigns) for any loss or damage caused by fire or any of the risks
enumerated in a standard "All Risk" insurance policy,  and, in the event of such
insured loss,  neither party's  insurance  company shall have a subrogated claim
against the other. To the extent permitted under both of the parties'  insurance
policies each party hereto shall obtain from its insurers  under all policies of
fire,  theft, and other casualty  insurance  maintained by it at any time during
the Term insuring or covering the BTS Site or the Site, or any portion  thereof,
improvements   thereon  or  operations  therein,  a  waiver  of  all  rights  of
subrogation which the insurer might have against the other party.

          (c)  During  the  Initial  Term and any  Renewal  Term of any SLA on a
particular  Site,  SBA shall  maintain an  all-risks  policy of property  damage
insurance on such Site which contains or provides for replacement  cost coverage
is  sufficient  in  amount  to  rebuild  and  replace  the  Tower  and other SBA
Improvements in the event of any casualty loss.  During the Initial Term and any
Renewal  Term of any SLA on a  particular  Site,  Bright PCS shall  maintain  an
all-risks  policy of property  damage  insurance on such Site which  contains or
provides for  replacement  cost  coverage is sufficient in amount to rebuild and
replace the Equipment in the event of any casualty loss.

     19. INDEMNIFICATIONS.

          (a) Subject to  Paragraph  18(b)  above,  Bright PCS shall  indemnify,
defend and hold SBA harmless from and against any and all injury,  loss, damage,
obligation,  penalty or liability  (or any claims in respect of the  foregoing),
costs or expenses (including reasonable attorneys' fees and court costs) imposed
upon, incurred by or asserted against SBA and arising from or on account of: (i)
any occurrence,  injury to or death of persons (including workmen) or loss of or
damage to property caused by the negligence or willful  misconduct of Bright PCS
or its agents,  employees or contractors,  licensees,  guests or invitees in the
use, operation,  maintenance or repair of or on the BTS Site,  excepting matters
caused  by the  negligence  or  willful  misconduct  of SBA  and  SBA's  agents,
employees,  representatives  and contractors (and Bright PCS shall not be deemed
SBA's  contractor  for  purposes  hereof)  or (ii) any  failure by Bright PCS to
perform or comply with any of the applicable  terms,  covenants or conditions of
the MSA or any applicable SLA.

                                       17
<PAGE>

          (b) Subject to Paragraph 18(b) above, SBA shall indemnify,  defend and
hold Bright PCS  harmless  from and against  any and all injury,  loss,  damage,
obligation,  penalty or liability  (or any claims in respect of the  foregoing),
costs or expenses (including reasonable attorneys' fees and court costs) imposed
upon,  incurred by or asserted against Bright PCS and arising from or on account
of: (i) any  occurrence,  injury to or death of persons  (including  workmen) or
loss of or damage to property caused by the negligence or willful  misconduct of
SBA or SBA's agents,  employees,  contractors,  licensees,  subtenants,  guests,
invitees  or other  persons on or about the BTS Site  other than  Bright PCS and
Bright PCS's agents,  employees,  representatives and contractors (and SBA shall
not be deemed Bright PCS's  contractor for purposes  hereof) or (ii) any failure
by SBA to perform or comply with any of the terms,  covenants or  conditions  of
the Ground Lease, this MSA or any applicable SLA.

          (c) SBA shall  have no  obligation  to  indemnify  Bright  PCS from or
against  nor shall  Bright PCS be  entitled  to assert a claim  against  SBA for
incidental and consequential damages arising from the negligence of SBA, but SBA
shall be responsible for incidental and  consequential  damages arising from the
intentional  torts and  willful  misconduct  of SBA or SBA's  officers,  agents,
employees, representatives, invitees and contractors. Likewise, Bright PCS shall
have no obligation to indemnify SBA from or against nor shall SBA be entitled to
assert a claim  against  Bright PCS for  incidental  and  consequential  damages
arising from the  negligence of Bright PCS, but Bright PCS shall be  responsible
for incidental and  consequential  damages arising from the intentional acts and
willful  misconduct of Bright PCS or Bright PCS's officers,  agents,  employees,
representatives,  invitees or contractors.  The foregoing  waivers of incidental
and consequential  damages shall not apply to damages  attributable to claims of
third parties to this MSA.

     20.  CELL  SITE  ON  WHEELS.   Should  Bright  PCS  experience  a  loss  in
communications service to its customers for any reason, Bright PCS shall be, and
hereby is,  authorized,  to the fullest extent permissible by applicable law and
ordinance  and the Ground  Lease,  to bring onto the BTS Site a mobile  wireless
communications  facility  or COW  during  such  period of loss of service to the
extent space is available and further provided that the presence of the COW does
not materially interfere with the maintenance, repair and restoration efforts of
SBA or the other tenants.  In the event that Bright PCS takes such action as the
result of a breach,  or other  negligent  or  wrongful  act or  omission of SBA,
Bright PCS shall be entitled to recover against SBA (or, at Bright PCS's option,
to set off against Rent payable  hereunder)  the  reasonable  costs and expenses
incurred by Bright PCS in implementing and maintaining such facility during such
period and of removing the same upon the re-establishment of regular service.

     21.  NOTICES.  All  notices,  requests,  demands  and other  communications
hereunder shall be in writing and personally delivered against receipt,  sent by
overnight  delivery  by a  nationally  recognized  overnight  carrier or mailed,
certified mail, return receipt requested, addressed as follows:

                                       18
<PAGE>

                  If to Bright PCS, to:

                  Bright PCS, LLC
                  68 East Main Street
                  P.O. Box 480
                  Chillicothe, Ohio 45601-0480
                  Attn:  Vice President Technology

                  With a copy to:

                  Lewellen & Frazier PLC
                  415 North McKinley, Suite 1240
                  Little Rock, AR 72205
                  Attention:  Todd A. Lewellen

                  If to SBA, to:

                  SBA Towers, Inc.
                  Onetown Center Road, 3rd Floor
                  Boca Raton, Florida 33486
                  Attention:  Site Administration

All notices,  demands and requests shall be effective upon actual  delivery,  if
personally  delivered against receipt or delivered by overnight carrier,  or, if
mailed on the date of the  United  States  Postal  Service  postmark;  provided,
however,  that the time  period in which a response  or action,  if any,  to any
notice,  demand or request must be given or completed shall commence to run from
the date of receipt of the notice,  demand or request by the addressee  thereof.
Rejection or failure to claim delivery of any such properly given notice, demand
or request, or any refusal to accept any such notice,  demand or request, or the
inability  to deliver  because of changed  address of which no notice was given,
shall be deemed to be receipt of the  notice,  demand or request  sent as of the
date of the United  States  Postal  Service  postmark  or the date of  attempted
personal  delivery  or  overnight  carrier  delivery,  as the  case  may be.  By
providing at least five (5) days' written notice thereof in accordance with this
Paragraph  21,  either  party  shall have the right from time to time and at any
time during the term of this MSA to change its address and to specify as its new
address any address within the continental United States of America.

     22. QUIET ENJOYMENT,  TITLE AND AUTHORITY. SBA covenants and warrants that:
(i) SBA has full right, power and authority to execute this MSA and the power to
grant all rights and interests  hereunder;  (ii) SBA's execution and performance
of this MSA will not violate any laws, ordinances,  covenants, or the provisions
of any mortgage,  lease or other agreement  binding on SBA; and (iii) subject to
matters of record as of an SLA Commencement  Date and condemnation  proceedings,
Bright PCS shall have the quiet enjoyment of each Site under this MSA during the
SLA Term.  SBA shall  indemnify  Bright  PCS from and  against  any loss,  cost,
expense  or damage  including  attorneys  fees  associated  with a breach of the

                                       19
<PAGE>

foregoing covenant of quiet enjoyment. Subject to Paragraph 22 (iii), Bright PCS
shall not be disturbed in its use and  occupancy of such Site or in the exercise
of its rights under this MSA or the  applicable SLA as long as Bright PCS is not
in default  hereunder  beyond any  applicable  grace or cure period.  Bright PCS
covenants  and  warrants  that:  (i)  Bright PCS has the full  right,  power and
authority to execute this MSA and perform its  obligations  hereunder,  and (ii)
Bright PCS's  execution and  performance  of this MSA will not violate any laws,
ordinances,  covenants,  or the  provisions  of any  mortgage,  lease  or  other
agreement binding on Bright PCS.

     23. ENVIRONMENTAL LAWS.

          (a) Bright PCS,  its heirs,  grantees,  successors,  and assign  shall
indemnify,  defend, reimburse and hold harmless SBA from and against any and all
damages,  caused by activities conducted on a Site by Bright PCS, and either (i)
arising  from the presence of any  substance,  chemical or waste  identified  as
hazardous,  toxic or dangerous in any applicable federal,  state or local law or
regulation  including  petroleum  or  hydrocarbon  based  fuels  such as diesel,
propane or natural  gas  (collectively,  "Hazardous  Materials")  introduced  by
Bright PCS upon,  about or beneath a Site or migrating  from such Site,  or (ii)
arising out of the  violation  by Bright PCS of any  environmental  requirements
applicable to a Site or applicable to the activities of Bright PCS on such Site.
Bright PCS covenants that it shall not nor shall Bright PCS allow its employees,
agents or independent  contractors  to treat,  store or dispose of any Hazardous
Materials on the BTS Site except in accordance with applicable laws.

          (b) Except as set forth above, SBA, its heirs,  grantees,  successors,
and assigns shall indemnify, defend, reimburse and hold harmless Bright PCS from
and against  any and all  damages  arising  from (i) the  presence of  Hazardous
Materials  upon,  about or beneath any BTS Site or  migrating to or from the BTS
Site  introduced  by  SBA or its  other  tenants,  or  (ii)  arising  out of the
violation  by  SBA or  its  other  tenants  of  any  environmental  requirements
pertaining to the BTS Site and any activities thereon.

     24. ASSIGNMENT AND SUBLEASING.

     Either party may assign all or a portion of its rights,  title or interests
hereunder  or under a  particular  SLA,  provided,  however,  that the  proposed
assignee  shall agree in writing to be bound by the terms and conditions of this
MSA and each  applicable SLA. In the event that the proposed  assignee  provides
audited  (i)  balance  sheets and (ii)  statements  of  operations  prepared  in
accordance with GAAP which indicate that the assignee has a financial  position,
as measured by reference to such assignee's net worth,  operating  results,  and
working  capital,  which is  comparable  to that of the  assigning  party's best
financial  position  using the same formula  during the previous three (3) years
but in no event  prior to the date of this MSA,  the  assigning  party  shall be
released from any and all obligations under the assigned instruments and for the
assigned  Sites.  No such assignment by either party shall affect the rights and
obligations  of the other party  under this MSA. In the event that the  proposed
assignee  does  not  have a  financial  position  (as  defined  above)  which is
comparable to the assigning party's best financial  position during the previous
three (3) years,  but in no event prior to the date of this MSA,  the  assigning
party shall remain liable for all obligations under the assigned instruments and
for the assigned Sites.  Bright PCS shall not be entitled to assign its interest
under this MSA or an SLA to an entity which  utilizes a spectrum  different than

                                       20
<PAGE>

that of Bright PCS unless it first  obtains  SBA's prior  written  consent which
consent shall not be conditioned or unreasonably withheld or delayed by SBA. SBA
acknowledges  that its  consent  to a  proposed  assignment  by Bright PCS to an
entity  which  operates  at a  spectrum  different  from  Bright  PCS's  will be
unreasonably  withheld  if  the  operation  at  said  spectrum  will  not  cause
interference  with the operation of other  equipment at each applicable BTS Site
affected by the SLA proposed to be assigned by Bright PCS. Bright PCS shall have
no right to  sublease  or  partially  assign its rights  under any SLA unless it
first  obtains  SBA's prior  written  consent;  however,  SBA shall be entitled,
subject to the other  provisions  hereof,  to sublease or  partially  assign its
rights under an SLA without obtaining Bright PCS's prior consent.

     25. NOTICE OF PROPOSED THIRD PARTY USE; RIGHT OF FIRST REFUSAL.

          (a) In the event  that (i) SBA  makes or  receives  a bona fide  offer
pursuant to which a third party would enter into a lease,  sublease,  license or
other occupancy  agreement with respect to any portion of a BTS Site (the "Right
of First  Refusal  Space")  during the term of this MSA and (ii) SBA  intends to
accept such offer,  then SBA shall  promptly send written  notice (the "Right of
First Refusal  Notice") to Bright PCS offering to lease or sublease the Right of
First Refusal Space to Bright PCS for the same rent and under the same terms and
conditions as the aforementioned bona fide offer (the "Right of First Refusal").
The Right of First Refusal Notice shall contain the following information:

               (i) the price,  terms,  and  condition  for the  occupancy of the
Right of First Refusal Space,  the name of the person or entity making the offer
and a description of the Right of First Refusal Space;

               (ii) evidence of the bona fide offer such as a written  proposal,
term sheet or proposed contract or a summary of a verbal offer; and

               (iii)  provided that such third party is a provider or carrier of
wireless communications services, the frequency or frequencies, proposed antenna
radiation  center  location  and  radiated  power  level and type of  technology
(whether CDMA, TDMA, etc.) to be utilized by such third party on the BTS Site.

          (b) Bright PCS shall have three (3) days after Bright PCS's receipt of
the Right of First  Refusal  Notice in accordance  with the notice  provision in
Paragraph  21 hereof  (which  three (3) day period is  referred to herein as the
"Acceptance  Period") to elect to exercise the Right of First Refusal. If Bright
PCS elects to exercise the Right of First  Refusal,  Bright PCS shall notify SBA
in writing within the Acceptance  Period of Bright PCS's intent to exercise such
right,  whereupon the Right of First Refusal shall become a binding contract for
the lease or sublease of the Right of First  Refusal  Space and Bright PCS shall
lease or sublease the Right of First Refusal Space in accordance with such rent,
terms and  conditions.  If Bright PCS does not notify SBA in writing  within the
Acceptance  Period of  Bright  PCS's  election  to  exercise  its Right of First
Refusal on such terms and  conditions,  Bright PCS's right to exercise its Right

                                       21
<PAGE>

of First Refusal on such terms and conditions shall terminate. This Paragraph 25
(b) shall not be deemed to limit or alter  Bright  PCs's  relocation  rights set
forth in  Paragraph 14 of this MSA or to relieve  Bright PCS of its  obligations
under the SLA prior to the exercise of the Right of First Refusal by Bright PCS.

     26. RIGHT OF FIRST REFUSAL TO PURCHASE.

          (a)  Except  in the  instance  of a sale of  substantially  all of the
assets of SBA or in the event of a merger or  reorganization  by SBA, if, at any
time  during  the Term SBA  receives  a bona fide  offer  from a third  party to
purchase any BTS Site (the "Offer"),  which Offer SBA is prepared to accept, SBA
shall  promptly  transmit  to Bright PCs its written  offer (the "First  Refusal
Notice")  to sell the BTS Site to Bright  PCS on the same  terms and  conditions
specified  in the Offer.  Bright PCS shall have ten (10)  business  days  within
which to accept  such  offer.  If Bright PCS shall  accept such offer by written
notice (the  "Acceptance  Notice") to SBA within said ten (10) day period  (such
Acceptance  Notice  shall  specify a closing date which is the earlier of thirty
(30) days from the date  thereof or the closing  date  specified  in the Offer),
such offer and acceptance  shall constitute a contract between them for the sale
by SBA and the  purchase by Bright PCS of the Site and shall not  thereafter  be
subject to rejection by either party.

          (b) If the Offer is not so accepted  by Bright  PCS,  SBA may sell the
BTS Site to such bona fide third party  purchaser on the terms  contained in the
Offer. Any such sale and transfer must be consummated  within 180 days following
the expiration of the time herein above provided for the acceptance of the Offer
by Bright  PCS. If the BTS Site is sold to such third  party,  the sale shall be
subject to this MSA and the  applicable  SLA and all of the  provisions  hereof,
including the right of first refusal provided in this Paragraph 26.

     27. WAIVER OF SBA'S LIEN.  SBA hereby waives any and all lien rights it may
have,  statutory  or  otherwise,  with  respect to the  Equipment or any portion
thereof.  The Equipment shall be deemed  personal  property for purposes of this
MSA and any SLA,  regardless  of whether any  portion  thereof is deemed real or
personal property under applicable law.

     28. CONFIDENTIAL INFORMATION.

          (a) USE OF CONFIDENTIAL INFORMATION. In order to permit the parties to
perform their respective  obligations  under this MSA, each party may, from time
to time,  disclose to the other  confidential or proprietary  information.  Such
confidential  or  proprietary  information  and  the  terms  of this  MSA  shall
constitute  "Confidential  Information".  Each party shall use all  Confidential
Information solely for the purpose of performing its obligations under this MSA.
Neither party shall disclose to any other person, other than employees or agents
of the party who agree,  in writing,  to be bound by an equivalent  undertaking,
any  Confidential  Information.  SBA agrees not to disclose  any of Bright PCS's
Confidential Information to a competitor of Bright PCS. Bright PCS agrees not to
disclose any of SBA's Confidential Information to a competitor of SBA.

          (b) EXCEPTIONS.  The  aforementioned  restrictions  shall apply to all
Confidential Information with the exception of the following:

                                       22
<PAGE>

               (i) Confidential Information which is made public by either party
while performing under this MSA or which otherwise is or hereafter  becomes part
of the public domain through no wrongful act,  fault,  or negligence on the part
of the other party;

               (ii)  Confidential  Information  which  a  party  can  reasonably
demonstrate is already in such party's possession and not subject to an existing
agreement of confidentiality.

               (iii)  Confidential  Information  which is received  from a third
party without  restriction and without breach of an agreement with Bright PCS or
SBA;

               (iv) Confidential Information which is independently developed by
a party as evidenced by its records; or

               (v)  Confidential  Information  which either party is required to
disclose pursuant to a valid order of a court or other  governmental body or any
political subdivision thereof, provided that, to the extent that it may lawfully
do so, the  disclosing  parry shall  provide the affected  party with  immediate
written  notice of the  nature  of the  required  disclosure  and  shall,  where
appropriate,  provide that party with the  opportunity to interpose an objection
or  obtain  a  protective  order  restricting  the  use  and  disclosure  of the
Confidential Information; or

               (vi) in  defense of a legal  action or  otherwise  required  by a
governmental agency or applicable law.

     29. MISCELLANEOUS.

          (a) Each  party  agrees  to  furnish  to the  other and to a person or
entity designated by the requesting party, within twenty (20) days after receipt
of written  request  such  truthful  estoppel  information  as either  party may
reasonably request.

          (b) Each party agrees to execute any documents (including a short form
or  memorandum of lease,  easement  agreement,  or both)  requested by the other
party to confirm of record its rights  under this MSA or any SLA (but  excluding
the economic terms  hereof).  Unless the laws of the state in which the BTS Site
is located  prohibit the  recordation  of a short form or  memorandum  of lease,
neither  party shall  record  this MSA,  but may record,  in lieu  thereof,  the
aforementioned  short form or  memorandum of lease or the SLA. In the event of a
recordation prohibition described above, either party may record any SLA. Either
party may record any easement agreement.

          (c)  This  MSA and the BTS  Agreement  including  all  SLAS,  exhibits
attached hereto and  incorporated  herein by reference  constitutes the sole and
entire  agreement  between the parties hereto with respect to the subject matter
hereof  and  supersedes  all  understandings,  contracts,  promises,  covenants,
representations,  statements,  agreements and  undertakings  (whether written or
oral),  with respect  thereto made prior to, the  execution and delivery of this
MSA.  This MSA or any SLA may not be modified  or  amended,  except by a written

                                       23
<PAGE>

instrument  signed by both  parties  hereto.  This MSA,  SBA's rights and Bright
PCS's  rights  hereunder  shall be deemed to be and hereby are  incorporated  by
reference  into each SLA for a Site and this MSA and each SLA shall run with and
burden title to each Site and BTS Site and, except as otherwise provided herein,
the provisions of this MSA and each SLA shall be binding upon and shall inure to
the benefit of the parties hereto and their  respective  heirs,  administrators,
executors,   legal  representatives,   successors  and  permitted  assigns.  The
paragraph  captions  and  headings  used in this  MSA  are  for  convenience  of
reference  only and shall not  affect  the  construction  to be given any of the
provisions  hereof.  If the time  period or date by which or on which any right,
option or election  provided  under this MSA must be exercised or by which or on
which any act required hereunder must be performed,  or by which or on which any
notice must be given or received,  expires or occurs on a Saturday,  Sunday or a
holiday  observed  by  state  chartered  or  national  banks  in  the  state  or
commonwealth in which the Site are located,  then such time period or date shall
be  automatically  extended  through  the end of the  next  day  which  is not a
Saturday,  Sunday  or such a  holiday.  All  exhibits  attached  to this MSA and
referred to herein are deemed incorporated in this MSA by reference.

          (d) Whenever possible, each provision of this MSA shall be interpreted
in such manner as to be  effective  and valid under  applicable  law, but if any
provision of this MSA shall be prohibited by or invalid  under  applicable  law,
such provision  shall be ineffective  only to the extent of such  prohibition or
invalidity,  without  invalidating  the  remainder  of  such  provision  or  the
remaining provisions of this MSA.

          (e) This  MSA does  not,  and  shall  not be  construed  to,  create a
partnership  or joint venture or any other  relationship  between SBA and Bright
PCS other than the relationship of lessor and lessee under the laws of the state
or commonwealth in which each BTS Site is located.

          (f) This MSA shall be governed by, and  construed in  accordance  with
the laws of the state where the applicable Site is situated.

          (g) This MSA may be executed in two or more counterparts, all of which
shall be considered one and the same  agreement and shall become  effective when
one or more counterparts  have been signed by the each of the parties,  it being
understood that all parties need not sign the same counterpart.

          (h)  Bright  PCS  shall be  entitled  to pursue  NDAs with the  Ground
Lessors  for each  Site;  provided,  however,  that SBA shall  have the right to
review  and  approve,  which  approval  shall not be  unreasonably  conditioned,
delayed or withheld,  all  correspondence  which is sent to the Ground  Lessors.
Bright PCS shall  provide SBA with copies of all such  correspondence  for SBA's
files.

          (i) Bright PCS and SBA hereby represent, agree and acknowledge that no
broker or other  person is  entitled  to claim or to be paid a  commission  as a
result of the  execution  and  delivery of this MSA.  Each of the parties  shall
indemnify,  defend and hold the other party  harmless  for all claims,  damages,
liabilities   and  expenses   (including   attorney's   fees)   arising  from  a
misrepresentation arising from the first sentence of this paragraph.

                                       24
<PAGE>

          (j)  Notwithstanding  anything to the contrary  contained in this MSA,
faxed  signatures  on this MSA shall be binding as though such  signatures  were
original ink signatures.

          (k)  Notwithstanding  anything to the contrary  contained in this MSA,
the terms of this MSA shall apply only to Region 1, which is  comprised  of BTAs
23, 39, 73, 78, 80, 126,  143,  155,  197, 233, 255, 280, 294, 342, 359, 424 and
487.  Bright PCS  represents  and  warrants  that Bright PCS shall not issue any
Search  Rings (as defined in the BTS  Agreement)  to any entity  during the Site
Acquisition  Term (as  defined  in the BTS  Agreement)  in  Region  2,  which is
comprised  of BTA 229.  This MSA does not  apply to Region 2 as a result of this
representation.  In the event that Bright PCS issues a Search Ring to any entity
in Region 2 during the Site  Acquisition  Term,  such  Search Ring and all other
Search Rings issued in Region 2 shall be subject to the BTS  Agreement  and this
MSA,  and  Region 2 shall be subject to the  exclusivity  provisions  of Section
_1.7_ of the BTS  Agreement,  except  that (i) the Rent for  Sites  within  such
Region 2 Search  Rings  shall be $1,300 a month  subject to a three (3) % annual
increase;  and (ii) Bright will be required to execute an Antenna Site Agreement
substantially  similar to the form  attached  as  Exhibit B to the  Master  Site
Agreement  dated as of August 17,  1999,  by and between BTS Company and Horizon
Personal Communications,  Inc. ("Horizon MSA"), to lease space on 20 tower sites
owned by BTS Company in Region 2 for $1,300 monthly Rent, subject to a 3% annual
increase and an initial one (1) year  abatement,  to the extent  Horizon has not
already done so pursuant to the Horizon MSA.

          IN  WITNESS  WHEREOF,  SBA and  Bright  PCS  have  duly  executed  and
delivered  this MSA. The party last  executing this MSA shall insert the date of
such  execution on the first page  hereof,  which date shall be the Date of this
MSA.

                                BTS COMPANY:

                                SBA TOWERS, INC.

                                By:   /s/ Jeffrey A. ???
                                   -------------------------------
                                Title:  Senior Vice President
                                Attest:
                                Title:  Assistant Secretary

                                         [CORPORATE SEAL]

                                 BRIGHT PCS, LLC

                                 By:  /s/ Mark J. Rekers
                                    ------------------------------
                                 Name:  Mark J. Rekers
                                 Title:  Secretary

<PAGE>

                                 ATTACHMENT "A"
                                       SLA

                            SITE LEASE ACKNOWLEDGMENT

     This Site Lease Acknowledgment  ("SLA") is made and entered into as of this
____  day of  ________  1999,  by and  between  Bright  Personal  Communications
Services,     LLC,    hereinafter     designated    as    "Bright    PCS"    and
_____________________________,  hereinafter  designated  as "SBA",  pursuant and
subject to that certain Master Site Agreement ("MSA") by and between the Parties
hereto,  dated as of October __, 1999. All  capitalized  terms have the meanings
ascribed to them in the MSA.

     1. The Site  leased by SBA to Bright PCS shall  consist of the Cable  Path,
Easements, Tower Space, and Ground Space, as those terms are defined in the MSA.
The Site is a portion  of that  certain  real  property,  located in the City of
__________,  the  County  of  ____________,  and the State of  __________,  more
particularly  described  in the  Memorandum  of Lease  which is recorded in Book
____, Page ____ [or as Instrument Number ____] in the office of the ____________
of  ____________  County,  ______________  (the  "BTS  Site").  The BTS  Site is
described in Exhibit "1" attached hereto and made a part hereof.

     2.  The  commencement  date  of  the  SLA  ("SLA  Commencement   Date")  is
____________, 1999. The first (1st) monthly rental payment is due and payable by
Bright PCS to SBA on the SLA Commencement Date in accordance with Paragraph 4 of
the MSA. Any future rent  adjustments  shall be calculated  in  accordance  with
Paragraph 4 of the MSA.

     3. The term of this SLA is five (5) years beginning on the SLA Commencement
Date.  The term of the SLA will  automatically  renew for  three (3)  additional
consecutive  five (5) year terms  unless  Bright PCS  notifies SBA in writing of
Bright PCS's intention not to renew as provided in Paragraph 3(c) of the MSA.

     4. Bright PCS has been granted certain  preferential rights pursuant to the
MSA which may affect  subsequent  tenants or purchasers  of the BTS Site.  These
preferential  rights  include a right of first refusal to purchase the BTS Site,
the right of first refusal to lease  additional space on the tower, the right to
relocate its equipment to a different  height on the tower, the right to install
additional  equipment on the BTS Site (subject to such  limitations  to install,
modify,  or replace the  equipment as may be provided in the MSA),  the right to
place a mobile  telecommunications  facility  on the  property  in the event the
existing  tower  facilities  are damaged or destroyed,  and the right to be free
from interference from subsequent tenants.

                                       25
<PAGE>

     IN WITNESS  WHEREOF,  the  parties  hereto have set their hands and affixed
their respective seals the day and year first above written.

                                        BRIGHT PCS, LLC

ATTEST:                                 ________________________

_________________________________       By: _________________________________
                                        Title:_______________________________

                                        SBA TOWERS, INC.

ATTEST:                                 ________________________

_________________________________       By:__________________________________
                                        Title:_______________________________

                               [ACKNOWLEDGEMENTS]

                                       26
<PAGE>

                             EXHIBIT "L" TO THE SLA

                        LEGAL DESCRIPTION OF THE BTS SITE

                                       27
<PAGE>

                                 ATTACHMENT "B"
                    NON-DISTURBANCE AND ATTORNMENT AGREEMENT

                                       28

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