SPECIALTY TELECONSTRUCTORS INC
SC 13D, 1998-05-04
WATER, SEWER, PIPELINE, COMM & POWER LINE CONSTRUCTION
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549



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



                                  SCHEDULE 13D
                                 (Rule 13d-101)


                    Under the Securities Exchange Act of 1934


                        SPECIALTY TELECONSTRUCTORS, INC.
                                (Name of Issuer)


                          COMMON STOCK, $0.01 PAR VALUE
                         (Title of Class of Securities)


                                   847517 10 9
                                 (CUSIP Number)


                                 Thomas O. Hicks
                         200 Crescent Court, Suite 1600
                               Dallas, Texas 75201
                                 (214) 740-7300
                  (Name, address and telephone number of person
                authorized to receive notices and communications)


                                 April 23, 1998
             (Date of event which requires filing of this Statement)


If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  that is the subject of this  Schedule  13D, and is filing this
schedule because of Rule 13d-1(e), (f) or (g), check the following box.







                         (Continued on following pages)





<PAGE>


- ----------------------------------               -------------------------------
     CUSIP No. 847517 10 9              13D                    Page 2
- ----------------------------------               -------------------------------


================================================================================
1       NAME OF REPORTING PERSON
        S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           Mr. Thomas O. Hicks
- --------------------------------------------------------------------------------
2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
           (a)
           (b)                                    X
- --------------------------------------------------------------------------------
3       SEC USE ONLY

- --------------------------------------------------------------------------------
4       SOURCE OF FUNDS
           OO
- --------------------------------------------------------------------------------
5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
        REQUIRED PURSUANT TO ITEM 2(d) or 2(e)

- --------------------------------------------------------------------------------
6       CITIZENSHIP OR PLACE OF ORGANIZATION

        United States
- --------------------------------------------------------------------------------
                                 7       SOLE VOTING POWER
           NUMBER OF
            SHARES                       0
         BENEFICIALLY           ------------------------------------------------
           OWNED BY              8       SHARED VOTING POWER
             EACH
           REPORTING                     6,750,000
            PERSON              ------------------------------------------------
             WITH                9       SOLE DISPOSITIVE POWER

                                         0
                                ------------------------------------------------
                                 10      SHARED DISPOSITIVE POWER

                                         6,750,000
- --------------------------------------------------------------------------------
11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        6,750,000
- --------------------------------------------------------------------------------
12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11
        EXCLUDES CERTAIN SHARES

- --------------------------------------------------------------------------------
13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

        45.8%
- --------------------------------------------------------------------------------
14      TYPE OF REPORTING PERSON

        IN
================================================================================


        *  The  reporting  person  expressly  disclaims (i) the existence of any
           group and (ii) beneficial  ownership with respect to any shares other
           than the shares owned of record by such reporting person. See Item 5.




<PAGE>


- -------------------------------                 --------------------------------
     CUSIP No. 847517 10 9             13D                    Page 3
- -------------------------------                 --------------------------------


================================================================================
1       NAME OF REPORTING PERSON
        S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        Hicks, Muse Fund III Incorporated
- --------------------------------------------------------------------------------
2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
           (a)
           (b)                                    X
- --------------------------------------------------------------------------------
3       SEC USE ONLY

- --------------------------------------------------------------------------------
4       SOURCE OF FUNDS
           OO
- --------------------------------------------------------------------------------
5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
        REQUIRED PURSUANT TO ITEM 2(d) or 2(e)

- --------------------------------------------------------------------------------
6       CITIZENSHIP OR PLACE OF ORGANIZATION

        Texas
- --------------------------------------------------------------------------------
                                 7       SOLE VOTING POWER
           NUMBER OF
            SHARES                       0
         BENEFICIALLY           ------------------------------------------------
           OWNED BY              8       SHARED VOTING POWER
             EACH
           REPORTING                     6,750,000
            PERSON              ------------------------------------------------
             WITH                9       SOLE DISPOSITIVE POWER

                                         0
                                ------------------------------------------------
                                 10      SHARED DISPOSITIVE POWER

                                         6,750,000
- --------------------------------------------------------------------------------
11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        6,750,000
- --------------------------------------------------------------------------------
12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11
        EXCLUDES CERTAIN SHARES

- --------------------------------------------------------------------------------
13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

        45.8%
- --------------------------------------------------------------------------------
14      TYPE OF REPORTING PERSON

        CO
================================================================================


        *  The  reporting  person  expressly  disclaims (i) the existence of any
           group and (ii) beneficial  ownership with respect to any shares other
           than the shares owned of record by such reporting person. See Item 5.




<PAGE>


- -------------------------------                   ------------------------------
     CUSIP No. 847517 10 9             13D                    Page 4
- -------------------------------                   ------------------------------


================================================================================
1       NAME OF REPORTING PERSON
        S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        Hicks, Muse GP Partners III, L.P.
- --------------------------------------------------------------------------------
2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
           (a)
           (b)                                    X
- --------------------------------------------------------------------------------
3       SEC USE ONLY

- --------------------------------------------------------------------------------
4       SOURCE OF FUNDS
           OO
- --------------------------------------------------------------------------------
5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
        REQUIRED PURSUANT TO ITEM 2(d) or 2(e)

- --------------------------------------------------------------------------------
6       CITIZENSHIP OR PLACE OF ORGANIZATION

        Texas
- --------------------------------------------------------------------------------
                                 7       SOLE VOTING POWER
           NUMBER OF
            SHARES                       0
         BENEFICIALLY           ------------------------------------------------
           OWNED BY              8       SHARED VOTING POWER
             EACH
           REPORTING                     6,750,000
            PERSON              ------------------------------------------------
             WITH                9       SOLE DISPOSITIVE POWER

                                         0
                                ------------------------------------------------
                                 10      SHARED DISPOSITIVE POWER

                                         6,750,000
- --------------------------------------------------------------------------------
11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        6,750,000
- --------------------------------------------------------------------------------
12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11
        EXCLUDES CERTAIN SHARES

- --------------------------------------------------------------------------------
13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

        45.8%
- --------------------------------------------------------------------------------
14      TYPE OF REPORTING PERSON

        PN
================================================================================


        *  The  reporting  person  expressly  disclaims (i) the existence of any
           group and (ii) beneficial  ownership with respect to any shares other
           than the shares owned of record by such reporting person. See Item 5.




<PAGE>


- --------------------------------                   -----------------------------
     CUSIP No. 847517 10 9              13D                   Page 5
- --------------------------------                   -----------------------------


================================================================================
1       NAME OF REPORTING PERSON
        S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        HM3 Coinvestors, L.P.
- --------------------------------------------------------------------------------
2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
           (a)
           (b)                                    X
- --------------------------------------------------------------------------------
3       SEC USE ONLY

- --------------------------------------------------------------------------------
4       SOURCE OF FUNDS
           OO
- --------------------------------------------------------------------------------
5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
        REQUIRED PURSUANT TO ITEM 2(d) or 2(e)

- --------------------------------------------------------------------------------
6       CITIZENSHIP OR PLACE OF ORGANIZATION

        Delaware
- --------------------------------------------------------------------------------
                                 7       SOLE VOTING POWER
           NUMBER OF
            SHARES                       0
         BENEFICIALLY           ------------------------------------------------
           OWNED BY              8       SHARED VOTING POWER
             EACH
           REPORTING                     6,750,000
            PERSON              ------------------------------------------------
             WITH                9       SOLE DISPOSITIVE POWER

                                         0
                                ------------------------------------------------
                                 10      SHARED DISPOSITIVE POWER

                                         6,750,000
- --------------------------------------------------------------------------------
11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        6,750,000
- --------------------------------------------------------------------------------
12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11
        EXCLUDES CERTAIN SHARES

- --------------------------------------------------------------------------------
13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

        45.8%
- --------------------------------------------------------------------------------
14      TYPE OF REPORTING PERSON

        PN
================================================================================


        *  The  reporting  person  expressly  disclaims (i) the existence of any
           group and (ii) beneficial  ownership with respect to any shares other
           than the shares owned of record by such reporting person. See Item 5.




<PAGE>


- -------------------------------                  -------------------------------
     CUSIP No. 847517 10 9              13D                  Page 6
- -------------------------------                  -------------------------------


================================================================================
1       NAME OF REPORTING PERSON
        S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        HM3/OmniAmerica Partners, LLC
- --------------------------------------------------------------------------------
2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
           (a)
           (b)                                    X
- --------------------------------------------------------------------------------
3       SEC USE ONLY

- --------------------------------------------------------------------------------
4       SOURCE OF FUNDS
           OO
- --------------------------------------------------------------------------------
5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
        REQUIRED PURSUANT TO ITEM 2(d) or 2(e)

- --------------------------------------------------------------------------------
6       CITIZENSHIP OR PLACE OF ORGANIZATION

        Delaware
- --------------------------------------------------------------------------------
                                 7       SOLE VOTING POWER
           NUMBER OF
            SHARES                       0
         BENEFICIALLY           ------------------------------------------------
           OWNED BY              8       SHARED VOTING POWER
             EACH
           REPORTING                     6,750,000
            PERSON              ------------------------------------------------
             WITH                9       SOLE DISPOSITIVE POWER

                                         0
                                ------------------------------------------------
                                 10      SHARED DISPOSITIVE POWER

                                         6,750,000
- --------------------------------------------------------------------------------
11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        6,750,000
- --------------------------------------------------------------------------------
12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11
        EXCLUDES CERTAIN SHARES

- --------------------------------------------------------------------------------
13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

        45.8%
- --------------------------------------------------------------------------------
14      TYPE OF REPORTING PERSON

        OO
================================================================================


        *  The  reporting  person  expressly  disclaims (i) the existence of any
           group and (ii) beneficial  ownership with respect to any shares other
           than the shares owned of record by such reporting person. See Item 5.




<PAGE>


- -------------------------------                 --------------------------------
     CUSIP No. 847517 10 9            13D                    Page 7
- -------------------------------                 --------------------------------


================================================================================
1       NAME OF REPORTING PERSON
        S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        HMTF/Omni Partners, L.P.
- --------------------------------------------------------------------------------
2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
           (a)
           (b)                                    X
- --------------------------------------------------------------------------------
3       SEC USE ONLY

- --------------------------------------------------------------------------------
4       SOURCE OF FUNDS
           OO
- --------------------------------------------------------------------------------
5       CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS
        REQUIRED PURSUANT TO ITEM 2(d) or 2(e)

- --------------------------------------------------------------------------------
6       CITIZENSHIP OR PLACE OF ORGANIZATION

        Delaware
- --------------------------------------------------------------------------------
                                 7       SOLE VOTING POWER
           NUMBER OF
            SHARES                       0
         BENEFICIALLY           ------------------------------------------------
           OWNED BY              8       SHARED VOTING POWER
             EACH
           REPORTING                     6,750,000
            PERSON              ------------------------------------------------
             WITH                9       SOLE DISPOSITIVE POWER

                                         0
                                ------------------------------------------------
                                 10      SHARED DISPOSITIVE POWER

                                         6,750,000
- --------------------------------------------------------------------------------
11      AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        6,750,000
- --------------------------------------------------------------------------------
12      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11
        EXCLUDES CERTAIN SHARES

- --------------------------------------------------------------------------------
13      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

        45.8%
- --------------------------------------------------------------------------------
14      TYPE OF REPORTING PERSON

        PN
================================================================================


        *  The  reporting  person  expressly  disclaims (i) the existence of any
           group and (ii) beneficial  ownership with respect to any shares other
           than the shares owned of record by such reporting person. See Item 5.




<PAGE>





Item 1.  Security and Issuer

   Common Stock, $0.01 par value (the "Common Stock")

   Specialty Teleconstructors, Inc. (the "Company")
   12001 State Highway 14 North
   Cedar Crest, New Mexico 87008

Item 2.  Identity and Background

   (a)   Name of Person(s) Filing this Statement (the "Filing
         Parties"):

         Mr. Thomas O. Hicks;
         Hicks,  Muse Fund III  Incorporated,  a Texas  corporation  ("Fund  III
         Incorporated");  Hicks,  Muse GP Partners  III,  L.P., a Texas  limited
         partnership  ("Hicks Muse  Partners  III");  HM3  Coinvestors,  L.P., a
         Delaware  limited  partnership  ("HM3  Coinvestors");   HM3/OmniAmerica
         Partners,  LLC, a Delaware limited  liability  company ("HM3 LLC"); and
         HMTF/Omni    Partners,    L.P.,   a   Delaware   limited    partnership
         ("OmniPartners").

   (b)   Residence or Business Address:

         The  address  of the  principal  business  office of each of the Filing
   Parties is 200 Crescent Court, Suite 1600, Dallas, Texas 75201.

   (c)   Present Principal Occupation:

         Thomas O. Hicks is the controlling  shareholder and the Chairman of the
   Board,  Chief  Executive  Officer and Secretary of Hicks,  Muse, Tate & Furst
   Incorporated  ("Hicks Muse"), a private  investment firm primarily engaged in
   leveraged  acquisitions,  recapitalizations,  and other  principal  investing
   activities.  Each of the other  Filing  Parties  is a  business  organization
   engaged in principal investing activities.

   (d)   Convictions in Criminal Proceedings during the last 5 Years:

         None of the Filing Parties has been convicted in a criminal  proceeding
   during the last 5 years.

   (e)   Proceedings involving Federal or State Securities Laws:

         None of the Filing Parties has,  during the last 5 years,  been a party
   to any  civil  proceeding  as a result  of which  he or it was  subject  to a
   judgment,   decree  or  final  order  enjoining  future   violations  of,  or
   prohibiting or mandating  activities  subject to, federal or state securities
   laws or finding any violations with respect to such laws.


                                     Page 8




<PAGE>







   (f)   Citizenship:

     Mr. Hicks is a United States  citizen.  Each of the other Filing Parties is
organized under the jurisdiction indicated in paragraph (a) of this Item 2.

Information with respect to Executive Officers, Directors and Control Persons of
Filing Parties not otherwise disclosed herein:

     John R.  Muse is the  Chief  Operating  Officer  of Fund III  Incorporated.
Charles  W.  Tate is the  President  of Fund III  Incorporated.  Each of Jack D.
Furst,  Lawrence D. Stuart,  Jr.,  Alan B. Menkes,  Michael J. Levitt,  David B.
Deniger and Dan H. Blanks is a Managing  Director and  Principal  and  Executive
Vice  President of Fund III  Incorporated.  Jack D. Furst is the Chairman of the
Board of HM3 LLC. Lawrence D. Stuart, Jr. is the President of HM3 LLC.

     The principal  business  address of each of the persons listed above is 200
Crescent Court,  Suite 1600,  Dallas,  Texas 75201. Each of Messrs.  Muse, Tate,
Furst, Stuart,  Menkes,  Levitt, Deniger and Blanks is presently a principal and
executive officer of Hicks Muse, a private  investment firm primarily engaged in
leveraged  acquisitions,   recapitalizations,   and  other  principal  investing
activities,  or an affiliate thereof. None of Messrs. Muse, Tate, Furst, Stuart,
Menkes,  Levitt,  Deniger or Blanks has been convicted in a criminal  proceeding
(excluding traffic violations or similar  misdemeanors) during the last 5 years.
None of Messrs. Muse, Tate, Furst,  Stuart,  Menkes,  Levitt,  Deniger or Blanks
has, during the last 5 years,  been a party to any civil  proceeding as a result
of which he was subject to a judgment,  decree or final order  enjoining  future
violations  of, or prohibiting  or mandating  activities  subject to, federal or
state  securities laws or finding any violations with respect to such laws. Each
of Messrs. Muse, Tate, Furst, Stuart,  Menkes,  Levitt,  Deniger and Blanks is a
United States citizen.

Item 3.  Source and Amount of Funds

     On April 23, 1998, OmniAmerica Holdings Corporation, a Delaware corporation
("Holdings"),   OmniAmerica,  Inc.,  a  Delaware  corporation  and  wholly-owned
subsidiary  of  Holdings  ("OmniAmerica"),  OmniPartners,  the  Company  and OAI
Acquisition  Corp., a Delaware  corporation and  wholly-owned  subsidiary of the
Company  ("Acquisition"),  consummated  the  transactions  contemplated  by that
certain  Amended  and  Restated  Agreement  and  Plan  of  Merger  (the  "Merger
Agreement"),  dated as of February 16, 1998, as amended and restated as of April
22, 1998, among Holdings,  OmniAmerica,  OmniPartners,  the Company, Acquisition
and  Omni/HSW  Acquisition,  Inc.,  which,  prior  to its  merger  with and into
Holdings  immediately  prior  to the  Merger  (as  hereinafter  defined),  was a
Delaware corporation.  Pursuant to the Merger Agreement,  Acquisition was merged
with and into Holdings (the  "Merger"),  with the effect that  Holdings,  as the
surviving

                                     Page 9




<PAGE>







corporation of the Merger,  became a wholly-owned  subsidiary of the Company. At
the  consummation of the Merger,  each share of the common stock, par value $.01
per share, of Holdings ("Holdings Common Stock") was converted into the right to
receive 0.09109398 shares of the Common Stock of the Company.

   OmniPartners received all shares of Common Stock covered by this Schedule 13D
as a result of the Merger by virtue of its record  ownership of Holdings  Common
Stock immediately prior to the effective time of the Merger.

   The description of the Merger Agreement  contained herein is qualified in its
entirety by reference to the  definitive  agreement,  which is filed herewith as
Exhibit 99(a).

Item 4.  Purpose of Transaction

   The shares of Common  Stock that are the  subject of this  Schedule  13D were
acquired  directly and indirectly by the Filing Parties  pursuant to the Merger.
The  Filing  Parties  reserve  the  right to  acquire  beneficial  ownership  of
additional shares of Common Stock or to sell shares of Common Stock from time to
time in the future.

   Pursuant to the Merger  Agreement,  the size of the Board of Directors of the
Company was increased to eight members. Pursuant to the Post-Merger Stockholders
Agreement  (the  "Stockholders  Agreement"),  dated as of April 23, 1998, by and
among  the  Company  and the  stockholders  of the  Company  signatory  thereto,
including, without limitation, OmniPartners, Hicks Muse is entitled to designate
up to four directors of the Board of Directors, dependent upon the percentage of
the Company's Common Stock owned by OmniPartners and its affiliates.

   The description of the Stockholders  Agreement  contained herein is qualified
in its  entirety  by  reference  to the  definitive  agreement,  which  is filed
herewith as Exhibit 99(b).

Item 5.  Interest in Securities of Issuer

   (a) As of the close of business on April 23, 1998, each of the Filing Parties
may be deemed to have  beneficially  owned in the aggregate  6,750,000 shares of
the  Common  Stock  of the  Company,  representing  approximately  45.8%  of the
outstanding  shares of Common Stock. Of such shares,  each of the Filing Parties
has sole voting and  dispositive  power with respect to none of the shares,  and
shared voting and dispositive power with respect to 6,750,000 shares as a result
of the relationships described in paragraph (b) below.

   (b) Of the 6,750,000 shares of Common Stock for which the Filing Parties have
shared voting and  dispositive  power,  all of such shares are held of record by
OmniPartners. HM3 LLC is the general partner of OmniPartners and, therefore, may
be deemed to

                                     Page 10




<PAGE>







be the  beneficial  owner of the  shares  of  Common  Stock  owned of  record by
OmniPartners.  HM3 Coinvestors is the sole member of HM3 LLC and, therefore, may
be deemed to be the beneficial owner of the shares of Common Stock  beneficially
owned  by HM3  LLC.  Hicks  Muse  Partners  III is the  general  partner  of HM3
Coinvestors  and,  therefore,  may be deemed to be the  beneficial  owner of the
shares  of  Common  Stock  beneficially  owned  by  HM3  Coinvestors.  Fund  III
Incorporated is the general  partner of Hicks Muse Partners III and,  therefore,
may  be  deemed  to be the  beneficial  owner  of the  shares  of  Common  Stock
beneficially  owned by Hicks Muse  Partners  III. Mr. Hicks is the sole director
and the Chairman of the Board,  Chief  Executive  Officer and Secretary and owns
all of the  outstanding  shares of capital stock of Fund III  Incorporated  and,
therefore,  may be deemed  to be the  beneficial  owner of the  shares of Common
Stock beneficially owned by Fund III Incorporated.

   Each of the Filing Parties expressly disclaims (i) the existence of any group
and (ii) beneficial ownership with respect to any shares of Common Stock covered
by this Schedule 13D not owned of record by him or it.

   (c) All of the  shares of Common  Stock  covered  by this  Schedule  13D were
received by OmniPartners on the date the Merger was consummated as consideration
for shares of  Holdings  Common  Stock held of record by  OmniPartners  upon the
terms set forth in the Merger Agreement.

   (d) The right to receive  dividends  on, and  proceeds  from the sale of, the
shares of Common  Stock  that are held of record by  OmniPartners  described  in
paragraphs (a) and (b) above is governed by the limited  partnership  agreements
of each of such  entities  (or,  with respect to HM3 LLC, its limited  liability
company  agreement)  and such  dividends  or proceeds  may be  distributed  with
respect to numerous general and limited partnership  interests (or, with respect
to HM3 LLC, membership interests).

   (e) Not applicable.

Item 6.  Contracts, Arrangements, Understandings or
         Relationships with Respect to the Securities of the
         Issuer

   Pursuant  to the terms of the  Stockholders  Agreement,  the  Company has the
right of first offer upon the proposed transfer of shares of Common Stock of the
Company.

   Also, pursuant to the Stockholders Agreement, OmniPartners and certain of its
affiliates  have  agreed  that  prior  to the  termination  of the  Stockholders
Agreement,  none of  them  will  purchase  or  otherwise  acquire,  directly  or
indirectly,  any additional  shares of the Company's common stock.  Furthermore,
none of such parties will take certain actions, including,

                                     Page 11




<PAGE>







without  limitation,  soliciting  proxies,  encouraging  the formation of voting
trusts or  commencing  other  actions  in order to seek  control of the Board of
Directors.

   The description of the Stockholders  Agreement  contained herein is qualified
in its  entirety  by  reference  to the  definitive  agreement,  which  is filed
herewith as Exhibit 99(b).

Item 7.  Material to be Filed as Exhibits

99(a)    Amended and Restated  Agreement  and Plan of Merger,  dated as of April
         22, 1998, among Holdings,  OmniAmerica,  OmniPartners, HSW, the Company
         and
         Acquisition.

99(b)    Post-Merger  Stockholders Agreement,  dated as of April 23, 1998, among
         the Company and the stockholders of the Company signatory thereto.

99(c)    Joint Filing Agreement, dated as of May 4, 1998, among Thomas O. Hicks,
         Fund III  Incorporated,  Hicks Muse Partners III, HM3 Coinvestors,  HM3
         LLC and OmniPartners.

                                     Page 12




<PAGE>





                                    SIGNATURE

     After  reasonable  inquiry and to the best of my  knowledge  and belief,  I
certify that the information  set forth in this statement is true,  complete and
correct.


                           THOMAS O. HICKS

                           By:           *
                              --------------------------
  May 4, 1998              Name: Lawrence D. Stuart, Jr.
   Date                    Title: Attorney-in-Fact


                           HICKS, MUSE FUND III INCORPORATED

                           By:           *
                              --------------------------
                           Name: Lawrence D. Stuart, Jr.
                           Title: Executive Vice President


                           HICKS, MUSE GP PARTNERS III, L.P.

                           By:   HICKS, MUSE FUND III INCORPORATED,
                                     its general partner

                                 By:           *
                                    -----------------------------
                                 Name: Lawrence D. Stuart, Jr.
                                 Title: Executive Vice President


                           HM3 COINVESTORS, L.P.

                           By:   HICKS, MUSE GP PARTNERS III, L.P.,
                                    its general partner

                                 By:   HICKS, MUSE FUND III INCORPORATED,
                                          its general partner

                                       By:          *
                                          ----------------------------
                                       Name: Lawrence D. Stuart, Jr.
                                       Title: Executive Vice President


                           HM3/OMNIAMERICA PARTNERS, LLC

                           By:           *
                              --------------------------
                           Name: Lawrence D. Stuart, Jr.
                           Title: President


                           HMTF/OMNI PARTNERS, L.P.

                           By:   HM3/OMNIAMERICA PARTNERS, LLC,
                                    its general partner
 
                                 By:          * 
                                    --------------------------
                                 Name: Lawrence D. Stuart, Jr.
                                 Title: President



                              /s/ Lawrence D. Stuart, Jr.
                           --------------------------------------
                           Lawrence D. Stuart, Jr.

                           *  Signing on behalf of the above listed
                              persons, in the respective capacities
                              indicated above.




                                                                   Exhibit 99(a)









                              AMENDED AND RESTATED

                          AGREEMENT AND PLAN OF MERGER


                                      among


                        SPECIALTY TELECONSTRUCTORS, INC.

                              OAI ACQUISITION CORP.


                                       and


                                OMNIAMERICA, INC.

                        OMNIAMERICA HOLDINGS CORPORATION

                           OMNI/HSW ACQUISITION, INC.

                            HMTF/OMNI PARTNERS, L.P.







                              Dated April 22, 1998


                AN APPENDIX OF DEFINED TERMS BEGINS ON PAGE (vi)










<PAGE>






                                TABLE OF CONTENTS


                                                                          Page

      ARTICLE I  THE MERGER..................................................2
                  1.1   Definitions..........................................2
                  1.2   The Merger...........................................2
                  1.3   Effective Time of the Merger.........................2
                  1.4   Certificate of Incorporation.........................2
                  1.5   Effects of the Merger................................2

      ARTICLE II  DIRECTORS AND OFFICERS.....................................3
                  2.1   Directors of STI, the Surviving Corporation and
                         OmniAmericaSub......................................3
                  2.2   Officers of the Surviving Corporation................3
                  2.3   Officers of STI......................................3

      ARTICLE III CONVERSION OF SECURITIES...................................3
                  3.1   Consideration for Merger.............................3
                  3.2   Surrender of Certificates............................4
                  3.3   Conversion of the Sub's Securities...................4
                  3.4   OmniPartners to Have No Further Rights as to
                         OmniAmerica.........................................4
                  3.5   Written Consent of Sole Stockholder of the Sub.......5
                  3.6   Written Consent of Sole Stockholder of OmniAmerica...5
                  3.7   Closing..............................................5

      ARTICLE IV  REPRESENTATIONS AND WARRANTIES.............................5
                  4.1   Representations and Warranties of OmniAmerica........5
                        4.1.1 Corporate and Partnership Existence and
                               Authority.....................................5
                        4.1.2 Capitalization of OmniAmerica and
                               OmniAmericaSub................................6
                        4.1.3 Validity and Authorization; Corporate Power
                               and Authority.................................8
                        4.1.4 Execution; No Violations.......................9
                        4.1.5 Governmental and Other Consents...............10
                        4.1.6 OmniAmerica Financial Statements..............10
                        4.1.7 Absence of Certain Liabilities................11
                        4.1.8 Absence of Changes............................11
                        4.1.9 Taxes.........................................15
                        4.1.10 Disputes and Litigation......................16
                        4.1.11 Compliance with Laws.........................17
                        4.1.12 Insurance....................................18
                        4.1.13 Title to Properties..........................18
                        4.1.14 Real Property and Real Property Leases.......18
                        4.1.15 Intangible Personal Property.................19
                        4.1.16 Agreements...................................20


                                     i



<PAGE>






                        4.1.17 Indebtedness and Guaranties..................20
                        4.1.18 Debts to and from Related Parties............21
                        4.1.19 Certificate of Incorporation and Bylaws......21
                        4.1.20 Books and Records............................21
                        4.1.21 Employee Benefits............................22
                        4.1.22 Employees....................................22
                        4.1.23 No Conflicts of Interest.....................23
                        4.1.24 Environmental Matters........................23
                        4.1.25 Licenses.....................................24
                        4.1.26 No Solicitation or Negotiation...............25
                        4.1.27 Tower Space Leases...........................25
                        4.1.28 KISCO Shares.................................26
                  4.2   Representations and Warranties of OmniPartners......26
                        4.2.1 Existence and Authority.......................26
                        4.2.2 Validity and Authorization; Partnership
                               Power and Authority..........................27
                        4.2.3 Execution; No Violations......................28
                        4.2.4 Governmental and Other Consents...............29
                        4.2.5 Investment Intent; Compliance with Securities
                               Laws.........................................30
                  4.3   Representations and Warranties of STI...............31
                        4.3.1 Corporate Existence and Authority.............31
                        4.3.2 Capitalization of STI.........................32
                        4.3.3 Validity and Authorization; Corporate Power
                               and Authority................................32
                        4.3.4 Execution; No Violations......................33
                        4.3.5 Governmental and Other Consents...............33
                        4.3.6 STI Financial Statements......................34
                        4.3.7 Absence of Certain Liabilities................34
                        4.3.8 Absence of Changes............................34
                        4.3.9 Taxes.........................................37
                        4.3.10 Disputes and Litigation......................38
                        4.3.11 Compliance with Laws.........................39
                        4.3.12 Insurance....................................39
                        4.3.13 Title to Properties..........................40
                        4.3.14 Real Property and Real Property Leases.......40
                        4.3.15 Intangible Personal Property.................41
                        4.3.16 Agreements...................................41
                        4.3.17 Indebtedness and Guaranties..................42
                        4.3.18 Debts to and from Related Parties............42
                        4.3.19 Articles of Incorporation and Bylaws.........42
                        4.3.20 Books and Records............................43
                        4.3.21 Employee Benefits............................43
                        4.3.22 Employees....................................43
                        4.3.23 No Conflicts of Interest.....................44
                        4.3.24 Environmental Matters........................44
                        4.3.25 Licenses.....................................45


                                     ii



<PAGE>






                        4.3.26 No Solicitation or Negotiation...............46
                        4.3.27 Fairness Opinion.............................46
                        4.3.28 Investment Intent; Compliance with
                                Securities Laws.............................46
                        4.3.29 Disclosure...................................46
                  4.4   Representations and Warranties of the Sub...........47
                        4.4.1 Corporate Existence and Authority.............47
                        4.4.2 Capitalization of the Sub.  ..................48
                        4.4.3 Validity and Authorization; Corporate Power
                               and Authority................................48
                        4.4.4 Execution; No Violations......................49
                        4.4.5 Governmental and Other Consents...............49
                  4.5   Disclosure Schedules................................49

      ARTICLE V  COVENANTS..................................................49
                  5.1   Mutual Covenants....................................49
                        5.1.1 Access and Information........................50
                        5.1.2 Notices and Approvals.........................50
                        5.1.3 No Solicitation or Negotiation................51
                        5.1.4 Proceedings...................................52
                        5.1.5 Reports and Returns...........................52
                        5.1.6 Assist in Obtaining Licenses, Etc.............52
                        5.1.7 Consents......................................52
                        5.1.8 Insurance.....................................53
                        5.1.9 Preservation of Business......................53
                        5.1.10 Tax Treatment................................53
                        5.1.11 Updating of Disclosure Schedules.............53
                        5.1.12 Other Covenants..............................53
                  5.2   OmniAmerica and OmniAmericaSub Covenants............54
                        5.2.1 Financial Statements..........................54
                        5.2.2 Restriction on Transfers......................54
                        5.2.3 Termination of Certain Affiliate Contracts....54
                        5.2.4 Zoning Compliance Letters.....................55
                        5.2.5 Conduct of Business...........................55
                        5.2.6 Preservation of Vote..........................56
                        5.2.7 Limitation on Short-Term Liabilities..........56
                  5.3   OmniPartners Covenants..............................56
                  5.4   Omni/HSW Acquisition Covenants......................56
                        5.4.1 Preservation of Vote..........................56
                        5.4.2 Conduct of Business...........................56
                  5.5   STI Covenants.......................................57
                  5.5.1 Restriction on Transfers............................57
                        5.5.2 Preservation of Vote..........................57
                        5.5.3 SEC Confirmation..............................57
                        5.5.4 Interim Financial Statements..................58
                        5.5.5 Conduct of Business...........................58


                                     iii



<PAGE>






                        5.5.6 Compliance with Nevada Corporation Law........59

      ARTICLE VI  CONDITIONS PRECEDENT TO CLOSING...........................60
                  6.1   Conditions Precedent to Obligations of STI and
                         the Sub............................................60
                        6.1.1 Representations and Warranties................60
                        6.1.2 Performance by OmniAmerica, OmniAmericaSub
                               and OmniPartners.............................60
                        6.1.3 Regulatory Approvals and Consents.............60
                        6.1.4 No Court Orders...............................60
                        6.1.5 No Material Adverse Change....................61
                        6.1.6 Certificates of OmniAmerica, OmniAmericaSub
                               and OmniPartners.............................61
                        6.1.7 Opinion of OmniAmerica's Counsel..............61
                        6.1.8 Audited Financial Statements and Auditors'
                               Consents.....................................61
                        6.1.9 Good Standing.................................61
                        6.1.10 Related Agreements...........................61
                        6.1.11 Termination of Affiliate Contracts...........62
                        6.1.12 Fairness Opinion.............................62
                        6.1.13 HMTF Affiliate...............................62
                        6.1.14 No Foreseen Material Adverse Effect..........62
                        6.1.15 Receipt of SEC Confirmation..................62
                        6.1.16 Short-Term Liabilities.......................62
                        6.1.17 HSW Merger...................................62
                  6.2   Conditions Precedent to Obligations of OmniAmerica,
                          OmniAmericaSub and OmniPartners...................62
                        6.2.1 Representations and Warranties................62
                        6.2.2 Performance by STI and the Sub................63
                        6.2.3 Regulatory Approvals and Consents.............63
                        6.2.4 No Court Orders...............................63
                        6.2.5 No Material Adverse Change....................63
                        6.2.6 Certificates of STI and the Sub...............63
                        6.2.7 Opinions of STI's Counsel.....................63
                        6.2.8 Good Standing.................................64
                        6.2.9 Related Agreements............................64
                        6.2.10 Tax Opinion..................................64

      ARTICLE VII CLOSING AND DELIVERY OF DOCUMENTS.........................64
                  7.1   Deliveries by OmniAmerica, OmniAmericaSub and
                         OmniPartners.......................................64
                  7.2   Delivery by STI.....................................65
                  7.3   Related Agreements..................................65

      ARTICLE VIII  TERMINATION.............................................66
                  8.1   Reasons for Termination.............................66


                                     iv



<PAGE>






                        8.1.1 By Mutual Consent.............................66
                        8.1.2 By STI........................................66
                        8.1.3 By OmniAmerica................................66
                        8.1.4 Drop-Dead Date................................67
                  8.2   Notice of Problems..................................67
                  8.3   STI Termination Procedure...........................67
                  8.4   OmniAmerica's Termination Procedure.................68
                  8.5   Effect of Termination...............................68
                  8.6   Termination Fee.....................................68

      ARTICLE IX  MISCELLANEOUS.............................................69
                  9.2   Survival............................................69
                  9.3   Expenses............................................69
                  9.4   Notices.............................................69
                  9.5   Entire Agreement....................................71
                  9.6   Headings............................................72
                  9.7   Incorporated by Reference...........................72
                  9.8   Number and Gender of Words..........................72
                  9.9   Execution of Additional Documents...................72
                  9.10  Finders' and Related Fees...........................72
                  9.11  Interpretation......................................72
                  9.12  No Third Party Beneficiary, Etc.....................72
                  9.13  Reformation; Severability...........................72
                  9.14  Binding Effect and Assignment.......................73
                  9.15  Public Announcements................................73
                  9.16  Confidentiality.....................................73
                  9.17  No Other Representation.............................74
                  9.18  Time of the Essence.................................75
                  9.19  Counterparts........................................75
                  9.20  Governing Law.......................................75




                                     v



<PAGE>






                                   APPENDIX OF
                                  DEFINED TERMS


     "Acquired   Businesses"  means  the  assets  and  businesses   acquired  by
OmniAmericaSub  pursuant to: (i) that Purchase and Sale Agreement by and between
Radio Seaway, Incorporated and OmniAmericaSub dated December 19, 1997; (ii) that
Purchase and Sale  Agreement by and between Ardman  Broadcasting  Corporation of
Florida and OmniAmericaSub dated November 22, 1997; (iii) that Purchase and Sale
Agreement by and among Dein P.  Spriggs,  Trustee of the Dein P. Spriggs  Profit
Sharing  Trust and  Robert D.  Aebersold,  Trustee  of the  Robert D.  Aebersold
Pension  Trust and  OmniAmericaSub  dated  October 23, 1997;  (iv) that Purchase
Agreement by and among  OmniAmericaSub  and certain of the partners of OmniTower
Ltd. and South Atlantic Venture Fund III, Limited Partnership dated December 23,
1997; and (v) that Purchase and Sale Agreement by and among Miller  Transmission
Tower Company Ltd, Cowboy Tower Company LLC and OmniAmericaSub dated January 16,
1998.

     "Acquisition" shall have the meaning ascribed to it in Section 5.1.3.

     "Acquisition  Proposal"  shall have the  meaning  ascribed to it in Section
5.1.3.

     "Affiliate"  shall mean, with respect to a specified  Person, a Person that
directly,  or  indirectly  through  one or more  intermediaries,  controls or is
controlled by, or is under common control with,  the Person  specified.  For the
purposes  of this  definition,  "control"  when used with  respect to any Person
means the power to direct the management  and policies of such Person,  directly
or indirectly,  whether through the ownership of voting securities,  by contract
or  otherwise;  and the  terms  "controlling"  and  "controlled"  have  meanings
correlative to the foregoing.

     "Agreement"  shall have the meaning  ascribed to it in the preamble to this
Agreement.

     "Applicable Date" shall have the meaning ascribed to it in Section 8.6.

     "Audited  Financial  Statements"  shall  mean  the DS&S  Audited  Financial
Statements,  the E&Y Audited  Financial  Statements,  the KPMG Audited Financial
Statements and the WC&G Audited Financial Statements.

     "Auditors'  Consents"  shall  have the  meaning  ascribed  to it in Section
5.2.1.

     "Beneficial  Ownership"  shall have the  meaning  given to it in Rule 13d-3
under the Exchange Act.



                                     vi



<PAGE>






     "Breach" shall mean, with respect to a party hereto,  any representation or
warranty of such party under this Agreement being untrue when made by such party
or any  breach  of any of  such  party's  covenants  or  agreements  under  this
Agreement.

     "Budagher" shall mean Michael R. Budagher.

     "Business  Day" shall mean a day other than a  Saturday,  a Sunday or other
day on which commercial banks located in New York are authorized or obligated to
close.

     "Carpenter" shall mean Tommie R. Carpenter.

     "Closing" shall mean the  consummation of the Merger and the closing of the
transactions contemplated by this Agreement.

     "Closing Date" shall have the meaning ascribed to it in Section 3.7.

     "Code" shall have the meaning ascribed to it in the Recitals.

     "Confidential Information" shall have the meaning ascribed to it in Section
9.16.

     "Contracts" shall have the meaning ascribed to it in Section 4.1.16.

     "DGCL" shall have the meaning ascribed to it in the Recitals.

     "Disclosing Party" shall have the meaning ascribed to it in Section 9.16.

     "Disclosure   Schedule"   shall  mean  (a)  in  the  case  of  OmniAmerica,
OmniAmericaSub   and  OmniPartners,   the  Disclosure   Schedule   delivered  by
OmniAmerica,  OmniAmericaSub  and OmniPartners to STI at or prior to the date of
this Agreement pursuant to Sections 4.1 and 4.2,  including without  limitation,
the  Disclosure  Schedule  dated as of  February  16,  1998  and the  Disclosure
Schedule dated as of April 22, 1998 and related to Omni/HSW  Acquisition and (b)
in the case of STI and the Sub, the Disclosure Schedule delivered by STI and the
Sub to OmniAmerica, OmniAmericaSub and OmniPartners pursuant to Sections 4.3 and
4.4, including without limitation,  the Disclosure Schedule dated as of February
16, 1998 and the Disclosure Schedule dated as of April 22, 1998.

     "DS&S" shall mean Derrick, Stubbs & Stith.

     "DS&S Audited  Financial  Statements" shall have the meaning ascribed to it
in Section 5.2.1.

     "E&Y" shall mean Ernst & Young, LLP.



                                       vii



<PAGE>






     "E&Y Audited Financial Statements" shall have the meaning ascribed to it in
Section 5.2.1.

     "Effective Time" shall have the meaning ascribed to it in Section 1.3.

     "Effective  Time of the HSW  Merger"  shall  mean the date and time  when a
properly executed certificate of merger relating to the HSW Merger, in such form
as is required by and executed in accordance with the relevant provisions of the
DGCL, is duly filed with the Secretary of State of the State of Delaware.

     "EIA" shall mean an environmental impact assessment.

     "Environmental Claim" shall mean any and all administrative,  regulatory or
judicial actions,  suits, demands,  demand letters,  directives,  claims, Liens,
Proceedings  or notices of  non-compliance  or violation by any Person  alleging
potential  liability  (including,  without  limitation,  potential liability for
enforcement,  investigatory costs, cleanup costs,  governmental  response costs,
removal costs,  remedial costs,  natural  resources  damages,  property damages,
personal injuries,  or penalties) arising out of, based on or resulting from (A)
the presence,  or release or  threatened  release into the  environment,  of any
Hazardous Material at any location,  whether owned, operated,  leased or managed
by any of the  OmniSubsidiaries  or STI, as the case may be, with respect to its
business;  (B) circumstances  reasonably forming the basis of any violation,  or
alleged violation,  of any Environmental Law by any of the  OmniSubsidiaries  or
STI,  as the case may be; or (C) any and all  written  claims by any third party
seeking damages, contribution,  indemnification,  cost recovery, compensation or
injunctive  relief  resulting  from the  presence  or release  of any  Hazardous
Materials.

     "Environmental  Laws"  shall mean all  applicable  federal,  state or local
laws, rules,  regulations,  orders or other legal  requirements  relating to the
regulation or protection of human health (other than OSHA and  comparable  state
laws and  regulations  relating  to the  protection  of  workers'  health in the
workplace),  safety,  the environment or natural resources  (including,  without
limitation,  ambient air, soil, surface water, ground water,  wetlands,  land or
subsurface strata), including, without limitation, laws and regulations relating
to releases or threatened releases of Hazardous Materials, or otherwise relating
to the manufacture, processing, distribution, use, treatment, storage, disposal,
transport, recycling or handling of Hazardous Materials.

     "ERISA" shall mean the Employee  Retirement Income Security Act of 1974, as
amended.

     "Exchange Act" shall mean the Securities  Exchange Act of 1934, as amended,
and the rules and regulations promulgated by the SEC thereunder.

     "FAA" shall mean the Federal Aviation Administration.



                                      viii



<PAGE>






     "Fairness  Opinion"  shall  mean  the  fairness  opinion  dated on or about
February  16,  1998 from  Wasserstein  Perella  & Co.,  to the  effect  that the
exchange  ratio  specified  in Section  3.1(a) is fair to STI,  from a financial
point of view.

     "Family Member" shall mean, as to any natural Person, such Person's spouse,
grandparent or descendant of that  grandparent,  children  (natural or adopted),
natural   or   adopted   siblings,   mothers   and   fathers-in-law,   sons  and
daughters-in-laws, and brothers and sisters-in-law.

     "FCC" shall mean the Federal Communications Commission.

     "GAAP"  shall mean  those  generally  accepted  accounting  principles  and
practices  which are used in the  United  States and  recognized  as such by the
American Institute of Certified Public Accountants acting through its Accounting
Principles Board or by the Financial Accounting Standards Board or through other
appropriate boards or committees thereof and which are consistently  applied for
all  periods  so as to  properly  reflect  the  financial  position,  results of
operations and cash flows on a consolidated basis of the party,  except that any
accounting  principle  or  practice  required  to be changed  by the  Accounting
Principles Board or Financial  Accounting  Standards Board (or other appropriate
board or  committee)  in order to continue as a  generally  accepted  accounting
principle or practice may be so changed.

     "General  Increase"  shall  have  the  meaning  ascribed  to it in  Section
4.1.8(g).

     "Governmental  Entity"  shall have the  meaning  ascribed  to it in Section
4.1.5(a).

     "Hazardous  Materials"  shall mean any waste,  material or other  substance
that is listed, defined, designated or classified as, or otherwise determined to
be, hazardous, radioactive, toxic or words of similar import or a pollutant or a
contaminant under or pursuant to any Environmental Law, including any mixture or
solution  thereof,  and  specifically  including  petroleum and all  derivatives
thereof or synthetic  substitutes  therefor and asbestos or  asbestos-containing
materials.

     "HM Partners" shall mean Hicks, Muse & Co. Partners,  L.P., a Texas limited
partnership.

     "HMTF"  shall  mean  Hicks,  Muse,  Tate  &  Furst  Incorporated,  a  Texas
corporation.

     "HSR Act" shall mean the  Hart-Scott-Rodino  Antitrust  Improvements Act of
1976, as amended, and the rules and regulations promulgated thereunder.

     "HSW Assets" shall mean the assets acquired by  OmniAmericaSub  pursuant to
that certain Purchase and Sale Agreement by and between H.S.W. Associates,  Inc.
and OmniAmerica Wireless, L.P. dated October 13, 1997, as amended.



                                       ix



<PAGE>






     "HSW Merger"  shall mean the merger of Omni/HSW  Acquisition  with and into
OmniAmerica  prior to the Closing in accordance with the terms of the HSW Merger
Agreement.

     "HSW Merger Agreement" shall mean that certain agreement and plan of merger
to be entered into by and between Omni/HSW  Acquisition and OmniAmerica prior to
the Closing,  the form of which is attached  hereto as Exhibit (ix) - HSW Merger
Agreement.

     "KISCO"  shall  mean  Kline  Iron &  Steel  Co.,  Inc.,  a  South  Carolina
corporation.

     "KISCO  Shares"  shall mean the 11,000  voting common shares and the 60,000
non-voting common shares of KISCO owned by OmniAmericaSub.

     "Kline Consulting  Agreement" shall mean that certain Consulting  Agreement
dated November 14, 1997 by and between Jerome C. Kline and OmniAmericaSub.

     "Kline Option  Agreement"  shall mean that certain  Stock Option  Agreement
dated as of November 14, 1997 by and between Jerome C. Kline and OmniAmerica.

     "Kline  Shareholders   Agreement"  shall  mean  that  certain  Shareholders
Agreement dated as of November 14, 1997 by and among Jerome C. Kline,  KISCO and
OmniAmericaSub.

     "Knowledge  of  OmniAmerica"  shall mean the actual  (rather than  imputed)
knowledge of any individual member of the OmniAmerica  Management and the phrase
"Known to  OmniAmerica"  and similar  phrases shall have a  correlative  meaning
thereto.

     "Knowledge of STI" shall mean the actual (rather than imputed) knowledge of
any  individual  member  of STI  Management  and the  phrase  "Known to STI" and
similar phrases shall have a correlative meaning thereto.

     "KPMG" shall mean KPMG Peat Marwick LLP.

     "KPMG Audited  Financial  Statements" shall have the meaning ascribed to it
in Section 5.2.1.

     "Licenses" shall have the meaning ascribed to it in Section 4.1.25.

     "Lien"  shall mean any  mortgage,  deed of trust,  lien,  pledge,  security
interest or encumbrance of any nature whatsoever but shall exclude those certain
title  exceptions  that are set forth in those certain  Owner  Policies of Title
Insurance that are referenced on Exhibit  (x)--Liens  attached hereto and made a
part hereof for all purposes.

     "Material   Adverse  Effect"  shall  mean  (i)  with  respect  to  each  of
OmniPartners,  OmniAmerica or  OmniAmericaSub,  a material adverse effect on (x)
the business, properties,


                                        x



<PAGE>






assets,  condition (financial or otherwise),  prospects or results of operations
of OmniAmerica, Omni/HSW Acquisition and the OmniSubsidiaries,  taken as a whole
(other  than  changes in general  economic  conditions  or in  economic  changes
generally  affecting  the tower  industry),  (y) its ability to  consummate  the
transactions  contemplated  in this  Agreement and in the Related  Agreements to
which it is a party without material delay or (z) the enforceability  against it
of this Agreement or the Related  Agreements  identified in Section 7.3 to which
it is a party  and (ii)  with  respect  to each of STI and the Sub,  a  material
adverse effect on (x) the business,  properties, assets, condition (financial or
otherwise),  prospects  or  results  of  operations  of STI,  the Sub and  their
respective  Subsidiaries,  taken  as a whole  (other  than  changes  in  general
economic  conditions  or in  economic  changes  generally  affecting  the  tower
construction   industry),   (y)  its  ability  to  consummate  the  transactions
contemplated  in this  Agreement and in the Related  Agreements to which it is a
party  without  material  delay  or (z) the  enforceability  against  it of this
Agreement or the Related  Agreements  identified in Section 7.3 to which it is a
party.

     "Material  Breach  Termination"  shall have the  meaning  ascribed to it in
Section 8.6.

     "Merger" shall have the meaning ascribed to it in the Recitals.

     "Merger  Consideration" shall mean the 6,750,000 shares of STI Common Stock
issuable in the Merger, subject to adjustment as provided in Section 3.1(c).

     "Miller  Towers"  shall  mean  the  assets  and the  business  acquired  by
OmniAmericaSub  pursuant to that Purchase and Sale Agreement by and among Miller
Transmission  Tower  Company Ltd,  Cowboy Tower  Company LLC and  OmniAmericaSub
dated January 16, 1998.

     "OmniAmerica" shall have the meaning ascribed to it in the preamble to this
Agreement.

     "OmniAmerica  Affiliate Contracts" shall have the meaning ascribed to it in
Section 5.2.3.

     "OmniAmerica Common Stock" shall have the meaning ascribed to it in Section
3.1(a).

     "OmniAmerica  Consents"  shall have the  meaning  ascribed to it in Section
4.1.5(b).

     "OmniAmerica  Certificate" shall have the meaning ascribed to it in Section
3.1(a).

     "OmniAmerica  ERISA Plans" shall have the meaning ascribed to it in Section
4.1.21(a).

     "OmniAmerica Financial Statements" shall have the meaning ascribed to it in
Section 4.1.6.



                                       xi



<PAGE>






     "OmniAmerica  Management" shall mean Jack D. Furst, Daniel S. Dross, Steven
M. Smith, Carl E. Hirsch and Anthony S. Ocepek.

     "OmniAmerica  Permitted  Transactions"  shall  mean  (a)  all  actions  and
payments in connection with the construction of the MATC tower in Milwaukee, the
Tampa  Tall  Tower in  Tampa,  and the  Cowboy  tower  in  Dallas,  (b)  capital
expenditures made by OmniPartners or Omni/HSW Acquisition in connection with the
improvement  of assets  purchased  from  H.S.W.  Associates,  Inc.,  (c) capital
expenditures  in connection  with  improvement of assets  purchased from Dein P.
Spriggs,  Trustee  of the  Dein P.  Spriggs  Profit  Sharing  Trust,  Robert  D.
Aebersold,  Trustee  of the  Robert D.  Aebersold  Pension  Trust and Ardman the
Broadcasting  Corporation of Florida,  (d) any transactions agreed to in writing
by STI or the Sub,  (e) any  cancellation,  renegotiation  or  amendment  of any
OmniAmerica   Affiliate  Contracts;   provided,   that  any  such  cancellation,
renegotiation  or amendment does not materially  increase the obligations of the
parties  thereto,  (f) any  transactions  entered  into in  accordance  with the
provisions   of  Sections   5.2.5  (solely  with  respect  to   OmniAmerica   or
OmniAmericaSub) and 5.4.2 (solely with respect to Omni/HSW Acquisition), (g) the
issuance of shares of Omni/HSW  Acquisition to OmniPartners in connection with a
contribution  of  capital  to  Omni/HSW  Acquisition  by  OmniPartners,  (h) the
execution and delivery of the HSW Merger Agreement,  (i) the consummation of the
HSW  Merger  and  (j)  any  transactions  between  OmniAmerica,  OmniAmericaSub,
OmniPartners,  HM Partners or Omni/HSW Acquisition,  on the one hand, and STI or
the Sub, on the other hand.

     "OmniAmerica  Plans"  shall  have the  meaning  ascribed  to it in  Section
4.1.21(a).

     "OmniAmerica  Related  Persons"  shall have the  meaning  ascribed to it in
Section 4.1.18.

     "OmniAmerica  Share"  shall  have the  meaning  ascribed  to it in  Section
3.1(a).

     "OmniAmericaSub"  shall have the meaning  ascribed to it in the preamble of
this Agreement.

     "OmniAmericaSub  Common  Stock"  shall have the  meaning  ascribed to it in
Section 4.1.1(a).

     "OmniAmericaSub  Intellectual  Property" shall have the meaning ascribed to
it in Section 4.1.15(a).

     "OmniAmerica  Termination  Fee" shall have the  meaning  ascribed  to it in
Section 8.6.

     "Omni/HSW  Acquisition"  shall  have  the  meaning  ascribed  to it in  the
preamble of this Agreement.



                                       xii



<PAGE>






     "OmniPartners"  shall have the meaning  ascribed  to it in the  preamble of
this Agreement.

     "OmniPartners  Consents"  shall have the meaning  ascribed to it in Section
4.2.4(b).

     "OmniSubsidiaries"  shall mean OmniAmericaSub,  OmniTower Ltd. and SATC and
solely for the purposes of Section 4.1, shall include Omni/HSW  Acquisition from
February 17, 1998 to the Effective Time of the HSW Merger and OmniAmerica solely
from the Effective Time of the HSW Merger.

     "OmniTower  Ltd." shall mean OmniTower Ltd., a Florida limited  partnership
formerly known as TowerCom, Limited.

     "OmniTower Ltd.  Partnership  Agreement" shall have the meaning ascribed to
it in Section 4.1.1(b).

     "OSHA" shall mean the Occupational, Safety and Health Administration.

     "Permitted  Lien" shall mean (a) any Lien for Taxes not yet due and payable
or contested in good faith by  appropriate  Proceedings  and for which  adequate
reserves  appear  in  the  OmniAmerica  Financial  Statements  with  respect  to
OmniAmerica, OmniAmericaSub and the Acquired Businesses and in the STI Financial
Statements  with  respect  to STI  and the  Sub,  (b) any  Lien  described  as a
"Permitted Lien" in a Disclosure  Schedule,  (c) any Lien as would be shown by a
current survey of the property (in the case of real  property),  (d) any Lien of
mechanics,  materialmen,  laborers,  warehousemen,  carriers  and other  similar
common law or  statutory  liens  which are not yet due and  payable or are being
contested  in  good  faith  and  for  which  adequate  reserves  appear  in  the
OmniAmerica Financial Statements with respect to OmniAmerica, OmniAmericaSub and
the Acquired Businesses and in the STI Financial  Statements with respect to STI
and the  Sub,  (e)  zoning,  entitlement,  land  use,  environmental  and  other
regulation by governmental  agencies, (f) purchase money Liens that may arise or
be  created  after  the date of this  Agreement  in the  ordinary  course of the
business,  (g) any Lien  granted  to any  lenders  prior to the date  hereof for
obligations  set forth in the Disclosure  Schedule or otherwise set forth in the
Financial  Statements of a party (except to the extent  previously  discharged),
(h) any Lien arising under this  Agreement or any Related  Agreement or pursuant
to a  Permitted  Transaction  and (i) other  Liens and defects in title which do
not, individually or in the aggregate,  materially interfere with the use of the
assets or materially detract from their value.

     "Permitted   Transactions"  shall  mean,   collectively,   the  OmniAmerica
Permitted Transactions and the STI Permitted Transactions.

     "Person"  shall  mean  any  individual,  corporation,   partnership,  joint
venture, association, joint-stock company, trust, unincorporated organization or
government or other agency or political subdivision thereof.


                                      xiii



<PAGE>







     "Post-Merger  Stockholders  Agreement" shall mean that certain  Post-Merger
Stockholders  Agreement,  effective  as of the  Closing  Date,  among  Budagher,
Carpenter,  OmniPartners,  STI and the other parties thereto, a form of which is
attached as Exhibit 7.3(a).

     "Post-Termination  Date Termination"  shall have the meaning ascribed to it
in Section 8.6.

     "Potential  Acquiror"  shall  have the  meaning  ascribed  to it in Section
5.1.3.

     "Pre-Merger  Stockholders  Agreement"  shall mean that  certain  Pre-Merger
Stockholders  Agreement,  effective  as of  the  date  hereof,  among  Budagher,
Carpenter, STI, OmniAmerica and OmniPartners.

     "Pre-Termination Date Termination" shall have the meaning ascribed to it in
Section 8.6.

     "Prior  Merger  Agreement"  shall have the  meaning  ascribed  to it in the
Recitals.

     "Proceedings" shall have the meaning ascribed to it in Section 4.1.10(a).

     "Related Agreements" shall have the meaning ascribed to it in Section 7.3.

     "Representatives" shall have the meaning ascribed to it in Section 9.16.

     "SATC"  shall  mean  the  South  Atlantic  Tower  Corporation,  a  Delaware
corporation.

     "SEC" shall mean the  Securities  and Exchange  Commission  as from time to
time  constituted  and created  under the Exchange Act, or, if at any time after
the execution of this instrument such Securities and Exchange  Commission is not
existing and  performing  the duties now assigned to it under the Exchange  Act,
then the Person performing such duties at such time.

     "SEC Confirmation" shall have the meaning ascribed to it in Section 5.5.3.

     "SEC  Documents"  shall  mean  the  documents  STI has  filed  with the SEC
pursuant to the Securities Act and the Exchange Act since June 30, 1996.

     "SEC Filings" shall have the meaning ascribed to it in Section 5.2.1.

     "Securities Act" shall mean the Securities Act of 1933, as amended, and the
rules and regulations promulgated by the SEC thereunder.

     "Significant  Acquired  Businesses"  shall mean the  assets and  businesses
acquired by OmniAmericaSub pursuant to: (i) that Purchase Agreement by and among
OmniAmericaSub


                                       xiv



<PAGE>






and certain of the partners of OmniTower  Ltd. and South  Atlantic  Venture Fund
III, Limited Partnership dated December 23, 1997 and (ii) that Purchase and Sale
Agreement  by and among Miller  Transmission  Tower  Company  Ltd,  Cowboy Tower
Company LLC, and OmniAmericaSub dated January 16, 1998.

     "STI"  shall  have  the  meaning  ascribed  to it in the  preamble  to this
Agreement.

     "STI Common Stock" shall have the meaning ascribed to it in Section 3.1(a).

     "STI Consents" shall have the meaning ascribed to it in Section 4.3.5(b).

     "STI  ERISA  Plans"  shall  have  the  meaning  ascribed  to it in  Section
4.3.21(a).

     "STI Financial Statements" shall have the meaning ascribed to it in Section
4.3.6.

     "STI  Intellectual  Property"  shall  have the  meaning  ascribed  to it in
Section 4.3.15.

     "STI Management" shall mean Michael R. Budagher, Ernie L. Carpenter, Dennis
K. Hartnett and Jeffrey A. Howard.

     "STI Permitted  Transactions"  shall mean (a) any transactions agreed to in
writing by OmniAmerica,  OmniAmericaSub  or  OmniPartners,  (b) any transactions
entered  into in  accordance  with the  provisions  of  Section  5.5.5,  (c) the
employment of Wasserstein,  Perella & Co. and the payment of their fees, (d) the
discharge  of  indebtedness  owed to  Carpenter  as shown  in the STI  Financial
Statements  and  (e)  any  transactions  between  OmniAmerica,   OmniAmericaSub,
OmniPartners,  HM Partners or Omni/HSW Acquisition,  on the one hand, and STI or
the Sub, on the other hand.

     "STI Plans" shall have the meaning ascribed to it in Section 4.3.21(a).

     "STI  Related  Persons"  shall have the  meaning  ascribed to it in Section
4.3.18.

     "STI Termination Fee" shall have the meaning ascribed to it in Section 8.6.

     "Stockholders  Agreements" shall mean the Pre-Merger Stockholders Agreement
and the Post-Merger Stockholders Agreement.

     "Sub"  shall  have  the  meaning  ascribed  to it in the  preamble  to this
Agreement.

     "Sub Common Stock" shall have the meaning ascribed to it in Section 3.3.

     "Subsequent  Disclosure  Schedule" shall have the meaning ascribed to it in
Section 5.1.11.



                                       xv



<PAGE>






     "Subsequent Event" shall have the meaning ascribed to it in Section 5.1.11.

     "Subsidiary"  of any Person  means (i) a  corporation  a majority  of whose
outstanding shares of capital stock or other equity interests with voting power,
under ordinary  circumstances,  to elect directors,  is at the time, directly or
indirectly,  owned by such Person, by one or more subsidiaries of such Person or
by such Person and one or more  subsidiaries of such Person,  and (ii) any other
Person  (other than a  corporation)  in which such Person,  a subsidiary of such
Person or such Person and one or more  subsidiaries of such Person,  directly or
indirectly,  at the date of determination  thereof,  has (x) at least a majority
ownership  interest  or (y) the  power to  elect or  direct  the  election  of a
majority of the directors or other governing body of such Person.

     "Superior Proposal" shall have the meaning ascribed to it in Section 5.1.3.

     "Surviving  Corporation"  shall have the meaning  ascribed to it in Section
1.2.

     "Taxes"  shall  mean  all  federal,   state,   local,   foreign  and  other
governmental or  quasi-governmental  net income,  gross income,  gross receipts,
sales, use, ad valorem, transfer,  franchise,  profits, license, lease, service,
service use, withholding, payroll, employment,  unemployment, excise, severance,
stamp, occupation, premium, property, windfall profits, customs, duties or other
taxes,  fees and  assessments  or charges of any kind  whatever in the nature of
taxes,  together  with  any  interest  and any  penalties,  additions  to tax or
additional amounts with respect thereto.

     "Tax Returns" shall have the meaning ascribed to it in Section 4.1.9(a).

     "Termination Date" shall have the meaning ascribed to it in Section 8.6.

     "Towers"  shall mean the towers  owned by  OmniAmerica  or  OmniAmericaSub,
including those acquired from the Acquired Businesses or included within the HSW
Assets.

     "Tower Space  Leases" shall mean each current lease of space on the Towers.
For purposes of this  Agreement,  (i)  references to a "lease" or "leases" shall
not be deemed to include  the Tower  Space  Leases and (ii) Tower  Space  Leases
shall not be deemed to be "real property leases."

     "WC&G" shall mean Wilen, Clapper & Glassman.

     "WC&G Audited  Financial  Statements"  shall have meaning ascribed to it in
Section 5.2.1.


                                       xvi



<PAGE>






                                    EXHIBITS

Exhibit (ix) --HSW Merger Agreement Form of HSW Merger Agreement
Exhibit (x)--Liens                  List of Owner Policies of Title Insurance
Exhibit 2.1                         Directors of STI, OmniAmerica and
                                    OmniAmericaSub
                                    following the Merger
Exhibit 5.2.3                       Retained Affiliate Contracts
Exhibit 6.1.7                       Form of Opinion of Weil, Gotshal & Manges
                                     LLP
Exhibit 6.2.7(a)                    Form of Opinion of Haynes and Boone, LLP
Exhibit 6.2.7(b)                    Form of Opinion of Jones, Vargas
Exhibit 6.2.10(a)                   Form of Tax Opinion
Exhibit 6.2.10(b)                   Form of OmniAmerica Certificate
Exhibit 6.2.10(c)                   Form of OmniPartners Certificate
Exhibit 6.2.10(d)                   Form of STI Certificate
Exhibit 7.3(a)                      Form of Post-Merger Stockholders Agreement
Exhibit 7.3(b)                      Form of Monitoring and Oversight Agreement
Exhibit 7.3(c)                      Form of Financial Advisory Agreement



                                      xvii



<PAGE>






                              AMENDED AND RESTATED
                          AGREEMENT AND PLAN OF MERGER


      THIS AMENDED AND RESTATED AGREEMENT AND PLAN OF MERGER (this "Agreement"),
dated  as  of  April  22,  1998,   is  entered  into  by  and  among   Specialty
Teleconstructors,  Inc., a Nevada corporation  ("STI"), OAI Acquisition Corp., a
Delaware corporation and a direct,  wholly-owned  subsidiary of STI (the "Sub"),
OmniAmerica,  Inc.,  a  Delaware  corporation  ("OmniAmericaSub"),   OmniAmerica
Holdings  Corporation,   a  Delaware  corporation   ("OmniAmerica"),   HMTF/Omni
Partners,  L.P., a Delaware limited partnership  ("OmniPartners"),  and Omni/HSW
Acquisition, Inc., a Delaware corporation ("Omni/HSW Acquisition").

                                   RECITALS

      The  parties  hereto  entered  into an  Agreement  and Plan of Merger (the
"Prior Merger  Agreement")  dated as of February 16, 1998 relating to the merger
of the Sub with and into OmniAmerica.  The parties hereto desire to make certain
changes to the Prior Merger  Agreement  and to amend,  restate and supersede the
Prior Merger Agreement in its entirety.

      The  parties  hereto  desire to effect the merger of the Sub with and into
OmniAmerica (the "Merger"),  with the effect that OmniAmerica,  as the surviving
corporation of the Merger, will become a wholly-owned subsidiary of STI.

      The board of directors of OmniAmerica  (a) has determined it advisable and
in the best interests of OmniAmerica and its sole  stockholder to consummate the
Merger,  upon the terms and subject to the  conditions  set forth  herein and in
accordance with the applicable  provisions of the Delaware  General  Corporation
Law ("DGCL"),  (b) has adopted and approved this  Agreement,  the Merger and the
other transactions  contemplated hereby and (c) has recommended  approval of the
Merger and this Agreement to its sole stockholder.

      The general  partner of  OmniPartners,  HM3/OmniAmerica  Partners LLC, has
determined it advisable and in the best interests of  OmniPartners  to adopt and
approve, and has adopted and approved, this Agreement,  the Merger and the other
transactions contemplated hereby.

      The board of directors of the Sub (a) has  determined  it advisable and in
the best interests of the Sub and its sole stockholder to consummate the Merger,
upon the terms and subject to the  conditions set forth herein and in accordance
with the  applicable  provisions of the DGCL,  (b) has adopted and approved this
Agreement, the Merger and the other transactions contemplated hereby and (c) has
recommended approval of the Merger and this Agreement to its sole stockholder.



                                     1



<PAGE>






      The board of directors of STI has  determined it advisable and in the best
interests of STI and its stockholders to adopt and approve,  and has adopted and
approved,  this Agreement,  the Merger and the other  transactions  contemplated
hereby.

      The parties intend that, for federal income tax purposes, the Merger shall
qualify as a  reorganization  under the provisions of Section  368(a)(1)(A)  and
Section  368(a)(2)(E)  of the  Internal  Revenue  Code of 1986,  as amended (the
"Code").

      The  parties  are   entering   into  this   Agreement   to  make   certain
representations,  warranties and  agreements as to the Merger,  and to prescribe
various conditions as to the Merger.

                                    AGREEMENT

      NOW,  THEREFORE,  in  consideration  of the  foregoing  premises  and  the
representations,  warranties,  covenants and agreements  contained  herein,  the
parties hereto agree as follows:

                                    ARTICLE I
                                   THE MERGER

      1.1 Definitions.  Capitalized  terms used herein but not otherwise defined
herein shall have the meanings ascribed thereto in the Appendix of Defined Terms
attached hereto beginning on page (vi).

      1.2 The Merger.  Upon the terms and subject to the conditions set forth in
this Agreement,  and in accordance with the DGCL, at the Effective Time, the Sub
shall be merged with and into OmniAmerica  with OmniAmerica  being the surviving
corporation  of the  Merger.  Upon  consummation  of the  Merger,  the  separate
corporate  existence of the Sub shall thereupon cease,  and OmniAmerica,  as the
surviving  corporation  in  the  Merger  (the  "Surviving  Corporation"),  shall
continue its corporate existence in accordance with the DGCL.

      1.3 Effective Time of the Merger. The Merger shall become effective at the
date and time (the  "Effective  Time") when a properly  executed  certificate of
merger,  in such form as is required  by and  executed  in  accordance  with the
relevant  provisions  of the DGCL,  is duly filed with the Secretary of State of
the State of Delaware.  The parties  hereto shall cause such filings to occur as
soon as practicable on the Closing Date.

      1.4 Certificate of  Incorporation.  At the Effective Time, the Certificate
of Incorporation  and Bylaws of OmniAmerica,  as they are in effect  immediately
prior to the Effective  Time,  shall be the  Certificate  of  Incorporation  and
Bylaws of the Surviving  Corporation  resulting from the Merger until thereafter
amended as provided by applicable law.

      1.5 Effects of the Merger.  The effects of the Merger shall be as provided
in the applicable  provisions of the DGCL.  Without limiting the foregoing,  and
subject thereto, the


                                     2



<PAGE>






corporate existence of OmniAmerica,  with all its purposes,  powers and objects,
shall  continue  unaffected  and  unimpaired by the Merger and, as the Surviving
Corporation  of the  Merger,  OmniAmerica  shall be  governed by the laws of the
State of  Delaware  and, at the  Effective  Time,  shall  succeed to all rights,
assets, liabilities,  properties, privileges, powers, franchises and obligations
of the Sub in  accordance  with the laws of the  State  of  Delaware.  As of the
Effective Time, the Surviving Corporation shall be a wholly-owned  subsidiary of
STI.

                                  ARTICLE II
                            DIRECTORS AND OFFICERS

      2.1 Directors of STI, the Surviving Corporation and OmniAmericaSub.  Prior
to the Effective  Time,  (a) STI shall increase the number of the members of the
board of  directors of STI to eight (8) and (b) STI and  OmniAmerica  shall take
such action as may be  necessary  such that each of the boards of  directors  of
STI, the Surviving  Corporation and  OmniAmericaSub,  immediately  following the
Effective Time, is comprised of the persons, subject to availability,  listed on
Exhibit 2.1. Each such director shall hold his or her directorship in accordance
with  the   applicable   certificate  or  articles  (as  the  case  may  be)  of
incorporation and bylaws of STI, OmniAmerica or OmniAmericaSub.

      2.2 Officers of the  Surviving  Corporation.  The officers of  OmniAmerica
immediately  prior to the  Effective  Time  shall  remain  the  officers  of the
Surviving Corporation until their respective successors shall be duly elected or
appointed,  as the case may be, and  qualified,  or until their  earlier  death,
resignation or removal.

      2.3  Officers  of STI.  STI  shall  take  such  action  so that,  upon the
Effective Time, the following persons,  subject to availability,  shall hold the
following  offices with STI in accordance with the articles of incorporation and
bylaws  of STI  until  their  respective  successors  shall be duly  elected  or
appointed,  as the case may be, and  qualified,  or until their  earlier  death,
resignation or removal:

      Carl E. Hirsch             President and Chief Executive Officer
      Michael R. Budagher        Chief Operating Officer
      Anthony S. Ocepek          Chief Financial Officer
      Jeffrey A. Howard          Vice President -- Corporate Development
      F. Howard Mandel           Vice President and General Counsel
      Steven M. Smith            Vice President -- Finance

                                  ARTICLE III
                           CONVERSION OF SECURITIES

      3.1 Consideration for Merger.

            (a) At the  Effective  Time, by virtue of the Merger of the Sub with
      and into  OmniAmerica and without any action on the part of OmniAmerica or
      the Sub, or their


                                     3



<PAGE>






      respective  stockholders  (other  than the  filing of the  certificate  of
      merger referred to in Section 1.3 hereof), (i) each share (an "OmniAmerica
      Share")  of the common  stock of  OmniAmerica,  par value  $0.01 per share
      ("OmniAmerica Common Stock"),  issued and outstanding immediately prior to
      the Effective Time (other than shares of OmniAmerica  Common Stock held in
      the treasury of  OmniAmerica)  shall be canceled and  extinguished  and be
      converted  automatically  into the right to receive  0.09109398  shares of
      common  stock of STI,  par value  $0.01 per share  ("STI  Common  Stock"),
      subject to adjustment  pursuant to Section 3.1(b),  payable as provided in
      Section 3.2 upon surrender of the certificate  formerly  representing such
      OmniAmerica   Share  (the  "OmniAmerica   Certificate"),   and  (ii)  each
      OmniAmerica  Share  then  held in the  treasury  of  OmniAmerica  shall be
      canceled and retired without conversion thereof and without payment of any
      consideration and shall cease to exist.

            (b) The Kline Option  Agreement shall remain  outstanding  following
      the Merger and shall not be  entitled to receive any portion of the Merger
      Consideration, but at the Effective Time, the Kline Option Agreement shall
      become  exercisable  for 36,363  shares of STI Common  Stock at an initial
      exercise  price of $13.75  per share,  pursuant  to the terms of the Kline
      Option Agreement.

            (c) In the event that,  subsequent to the date of this Agreement but
      prior to the Effective Time, the outstanding shares of STI Common Stock or
      OmniAmerica  Common Stock shall have been  increased,  decreased,  changed
      into or exchanged  for a different  number or kind of shares or securities
      through  a  reorganization,   recapitalization,   reclassification,  stock
      dividend,  stock split,  reverse stock split,  or other similar  change in
      capitalization,  or there shall have been  proposed any such change with a
      record  date  prior  to  the  Effective  Time,  then  an  appropriate  and
      proportionate adjustment shall be made in the Merger Consideration.

      3.2  Surrender  of  Certificates.   At  the  Closing,  OmniPartners  shall
surrender all outstanding OmniAmerica  Certificates to STI and STI shall pay and
deliver  to  OmniPartners  the Merger  Consideration  payable as a result of the
Merger in exchange for all such outstanding OmniAmerica Certificates.

      3.3 Conversion of the Sub's Securities.  At the Effective Time, each share
of common stock of the Sub, par value $0.01 per share ("Sub Common  Stock"),  of
the Sub issued and outstanding  immediately prior to the Effective Time shall be
converted,  by virtue of the  Merger and  without  any action on the part of the
holder thereof, into one fully paid and nonassessable share of common stock, par
value $0.01 per share, of the Surviving Corporation.

      3.4 OmniPartners to Have No Further Rights as to OmniAmerica. At and after
the Effective Time, OmniPartners shall cease to have any rights as a stockholder
of OmniAmerica, other than indirectly as a stockholder of STI.



                                     4



<PAGE>






      3.5 Written  Consent of Sole  Stockholder of the Sub.  Concurrent with the
execution of this  Agreement,  STI, as the sole  stockholder  of the Sub,  shall
deliver  certified  copies  of  its  corporate  resolutions  duly  adopting  and
approving  this  Agreement,   the  Related   Agreements,   the  Merger  and  the
transactions  contemplated  by this  Agreement  and the  Related  Agreements  by
written  consent.  STI,  as the sole  stockholder  of the Sub,  shall not amend,
rescind or withdraw its adoption and approval of this  Agreement and the Related
Agreements,  the Merger and the transactions  contemplated by this Agreement and
the Related Agreements.

      3.6 Written Consent of Sole  Stockholder of  OmniAmerica.  Concurrent with
the  execution  of this  Agreement,  OmniPartners,  as the sole  stockholder  of
OmniAmerica,  shall deliver certified copies of its partnership resolutions duly
adopting and approving this Agreement,  the Related  Agreements,  the Merger and
the  transactions  contemplated by this Agreement and the Related  Agreements by
written consent. OmniPartners, as the sole stockholder of OmniAmerica, shall not
amend,  rescind or withdraw its adoption and approval of this  Agreement and the
Related  Agreements,  the  Merger  and  the  transactions  contemplated  by this
Agreement and the Related Agreements.

      3.7 Closing.  Unless this  Agreement is  terminated  and the  transactions
contemplated  herein  abandoned  pursuant  to  Article  VIII and  subject to the
satisfaction  or, if permissible,  waiver of the conditions set forth in Article
VI, the Closing  shall take place (a) at the  offices of Haynes and Boone,  LLP,
Dallas,  Texas,  at 10:00 A.M.  local time on a date to be  specified by STI and
OmniAmerica,  but as soon as  practicable  (and in any event within two Business
Days) after the day on which the last of the  conditions set forth in Article VI
is fulfilled (other than deliveries of instruments to be made at Closing) or, if
permissible,  waived by the relevant  party or (b) at such other date,  time and
place as STI and OmniAmerica shall agree upon in writing.  The date on which the
Closing occurs is referred to herein as the "Closing Date."

                                  ARTICLE IV
                        REPRESENTATIONS AND WARRANTIES

      4.1 Representations  and Warranties of OmniAmerica.  To induce STI and the
Sub to enter into this Agreement and to consummate the transactions contemplated
hereby,  OmniAmerica  and  OmniAmericaSub  jointly and  severally  represent and
warrant  to STI  and  the  Sub as of the  date  hereof  as  follows  (each  such
representation  and warranty being  qualified in its entirety by the disclosures
set forth in the Disclosure Schedule, which such disclosures shall correspond to
the following sections and subsections):

            4.1.1 Corporate and Partnership Existence and Authority.

            (a) Each of  OmniAmerica,  OmniAmericaSub  and SATC is a corporation
      duly  organized,  validly  existing and in good standing under the laws of
      the State of Delaware and has all requisite  corporate power and authority
      to own its  properties  and assets and to carry on its  business as it has
      been and is being conducted,  except where the failure to be so organized,
      existing and in good standing or to have such power and


                                     5



<PAGE>






      authority  would not,  individually  or in the  aggregate,  reasonably  be
      expected   to  have  a  Material   Adverse   Effect  on   OmniAmerica   or
      OmniAmericaSub. Each of OmniAmerica,  OmniAmericaSub and SATC is qualified
      or  licensed  to do  business  as a  foreign  corporation  and is in  good
      standing  in each  state,  nation  or  other  jurisdiction  listed  on the
      Disclosure  Schedule,  being  each  state,  nation  or other  jurisdiction
      wherein the character of the properties owned or held under lease by it or
      the nature of the business  transacted by it makes such  qualification  or
      licensing  necessary,  except for any state,  nation or other jurisdiction
      where the failure to be so qualified or licensed  would not  reasonably be
      expected   to  have  a  Material   Adverse   Effect  on   OmniAmerica   or
      OmniAmericaSub.   Prior  to  the   Effective   Time  of  the  HSW  Merger,
      OmniAmerica's sole asset was and will be 1,000 shares of the common stock,
      par value $0.01 per share, of OmniAmericaSub (the  "OmniAmericaSub  Common
      Stock").

            (b) OmniTower Ltd. is a limited  partnership  organized  pursuant to
      and  presently  existing  under the laws of the State of  Florida  under a
      limited  partnership  agreement as amended to May 21, 1997 (the "OmniTower
      Ltd. Partnership Agreement"),  and has the necessary power to carry on its
      business  as it has been and is now  being  conducted,  except  where  the
      failure to be so organized,  existing and in good standing or to have such
      power  and  authority  would  not,   individually  or  in  the  aggregate,
      reasonably be expected to have a Material  Adverse Effect on  OmniAmerica.
      OmniTower  Ltd. is  qualified  or  licensed to do business  and is in good
      standing  in each  state,  nation  or  other  jurisdiction  listed  on the
      Disclosure  Schedule,  being  each  state,  nation  or other  jurisdiction
      wherein the character of the properties owned or held under lease by it or
      the nature of the business  transacted by it makes such  qualification  or
      licensing  necessary,  except for any state,  nation or other jurisdiction
      where the failure to be so qualified or licensed  would not  reasonably be
      expected   to  have  a  Material   Adverse   Effect  on   OmniAmerica   or
      OmniAmericaSub.  The  OmniTower  Ltd.  Partnership  Agreement has not been
      amended, and remains in full force and effect.  OmniAmerica has previously
      provided a true and correct copy of the OmniTower Ltd.
      Partnership Agreement to STI.




                                     6



<PAGE>






            4.1.2 Capitalization of OmniAmerica and OmniAmericaSub.

            (a) The authorized  capital stock of OmniAmerica  consists solely of
      80,000,000  shares of OmniAmerica  Common Stock of which 74,099,298 shares
      are  issued  and  outstanding.   No  other  shares  of  capital  stock  of
      OmniAmerica are issued and  outstanding or reserved for issuance.  All the
      issued and  outstanding  shares of capital stock of  OmniAmerica  are held
      solely by OmniPartners  free and clear of any Lien and OmniPartners is the
      record  and  Beneficial  Owner  of  such  shares.  All of the  issued  and
      outstanding  shares  of  capital  stock  of  OmniAmerica  have  been  duly
      authorized  and  validly  issued in  accordance  and  compliance  with all
      applicable   laws,   rules  and   regulations   and  are  fully  paid  and
      nonassessable  and were issued free of  preemptive  (or  similar)  rights.
      Other than the Kline Option Agreement,  there are no securities,  options,
      warrants, rights, calls, commitments, plans, contracts or other agreements
      of any character granted or issued by OmniAmerica,  OmniPartners or any of
      the OmniSubsidiaries which provide for the purchase,  issuance or transfer
      of any  shares  of the  capital  stock of  OmniAmerica,  nor are there any
      outstanding   securities   granted  or  issued  by  OmniAmerica  that  are
      convertible  into or exchangeable for or exercisable for any shares of the
      capital  stock of  OmniAmerica,  and none are  authorized.  All  presently
      exercisable  voting rights in  OmniAmerica  are vested  exclusively in the
      outstanding  shares of  OmniAmerica  Common Stock,  each share of which is
      entitled to one vote on every matter to come before its sole  stockholder,
      OmniPartners.  There are no  stockholders'  agreements,  voting  trusts or
      other voting  arrangements  with respect to any of  OmniAmerica's  capital
      stock. Other than pursuant to the terms of the HSW Merger Agreement, there
      are   no   outstanding   obligations   of   OmniAmerica   or  any  of  the
      OmniSubsidiaries   to   repurchase,   redeem  or  otherwise   acquire  any
      OmniAmerica   Common   Stock   or  the   capital   stock  of  any  of  the
      OmniSubsidiaries  or to provide  funds to or make any  investment  (in the
      form of a loan, capital contribution, guarantee or otherwise) in any other
      entity.  OmniAmerica  does not have any  direct  Subsidiaries,  other than
      OmniAmericaSub.

            (b) The authorized  capital stock of OmniAmericaSub  consists solely
      of 1,000 shares of  OmniAmericaSub  Common Stock of which 1,000 shares are
      issued and outstanding. No other shares of capital stock of OmniAmericaSub
      are issued and outstanding or reserved for issuance.

            (c) The  authorized  capital stock of SATC consists  solely of 1,000
      shares of common stock, par value $0.01 per share, of which 100 shares are
      issued  and  outstanding.  No other  shares of  capital  stock of SATC are
      issued and outstanding or reserved for issuance.

            (d) All the  issued  and  outstanding  shares  of  capital  stock of
      OmniAmericaSub  are held solely by OmniAmerica  free and clear of any Lien
      and OmniAmerica is the record and Beneficial Owner of such shares. All the
      issued and outstanding  shares of capital stock of SATC are held solely by
      OmniAmericaSub free


                                     7



<PAGE>






      and clear of any Lien and  OmniAmericaSub  is the  record  and  Beneficial
      Owner of such shares.  All of the issued and outstanding shares of capital
      stock of  OmniAmericaSub  and SATC have been duly  authorized  and validly
      issued in accordance and compliance  with all applicable  laws,  rules and
      regulations and are fully paid and  nonassessable  and were issued free of
      preemptive  (or  similar)  rights.  There  are  no  securities,   options,
      warrants, rights, calls, commitments, plans, contracts or other agreements
      of any character granted or issued by  OmniAmericaSub,  OmniAmerica or any
      of the  OmniSubsidiaries  that  provide  for  the  purchase,  issuance  or
      transfer of any shares of the capital stock of OmniAmericaSub or SATC, nor
      are there any outstanding  securities  granted or issued by OmniAmericaSub
      or SATC that are convertible  into or exchangeable  for or exercisable for
      any shares of the capital stock of  OmniAmericaSub  or SATC,  and none are
      authorized.  All presently exercisable voting rights in OmniAmericaSub are
      vested  exclusively in the  outstanding  shares of  OmniAmericaSub  Common
      Stock, each share of which is entitled to one vote on every matter to come
      before its sole stockholder, OmniAmerica. All presently exercisable voting
      rights in SATC are vested  exclusively in the outstanding shares of common
      stock of SATC, each share of which is entitled to one vote on every matter
      to come before its sole stockholder,  OmniAmericaSub.  There are no voting
      trusts, stockholders' agreements or other voting arrangements with respect
      to any of  OmniAmericaSub's  or SATC's capital stock.  OmniAmericaSub does
      not have any direct  Subsidiaries  other than SATC. SATC does not have any
      Subsidiaries other than OmniTower Ltd.

            (e) The only  general or limited  partners  of  OmniTower  Ltd.  are
      OmniAmericaSub  and SATC.  No other  partnership  interests are issued and
      outstanding  or  reserved  for  issuance.  All the issued and  outstanding
      partnership  interests  of  OmniTower  Ltd.  are  held by  either  SATC or
      OmniAmericaSub   free  and   clear  of  any  Lien  and   either   SATC  or
      OmniAmericaSub  is the  Beneficial  Owner  of such  interests.  All of the
      outstanding  partnership  interests  in  OmniTower  Ltd.  have  been  duly
      authorized  and  validly  issued in  accordance  and  compliance  with all
      applicable   laws,   rules  and   regulations   and  are  fully  paid  and
      nonassessable.  There are no securities, options, warrants, rights, calls,
      commitments, plans, contracts or other agreements of any character granted
      or issued by OmniTower  Ltd.  that provide for the  purchase,  issuance or
      transfer of any partnership interests in OmniTower Ltd., nor are there any
      outstanding  securities  granted  or issued  by  OmniTower  Ltd.  that are
      convertible  into or  exchangeable  for or exercisable for any partnership
      interests of OmniTower  Ltd.  Other than the  OmniTower  Ltd.  Partnership
      Agreement,  all presently  exercisable voting rights in OmniTower Ltd. are
      vested exclusively in the outstanding  partnership interests and there are
      no voting trusts,  partners'  agreements or other voting arrangements with
      respect to any of the  partnership  interests in OmniTower Ltd.  OmniTower
      Ltd. does not have any Subsidiaries.




                                     8



<PAGE>






            4.1.3 Validity and Authorization; Corporate Power and Authority.

            (a) OmniAmerica  has all necessary  corporate power and authority to
      execute, deliver and perform this Agreement,  the Related Agreements,  the
      HSW  Merger  Agreement  and  the  other  instruments  called  for by  this
      Agreement to which it is or is to be a party. The execution,  delivery and
      performance  of this  Agreement by  OmniAmerica  and the  consummation  by
      OmniAmerica  of the  transactions  contemplated  hereby have been duly and
      validly  authorized  by all  necessary  corporate  action  on the  part of
      OmniAmerica  (subject to the filing of  appropriate  merger  documents  as
      required by the DGCL). This Agreement has been duly executed and delivered
      by  OmniAmerica  and,  assuming  the valid  authorization,  execution  and
      delivery  hereof  by STI and the Sub,  constitutes  the  legal,  valid and
      binding  obligation of  OmniAmerica,  enforceable  against  OmniAmerica in
      accordance  with its terms,  except as such  enforcement may be limited by
      bankruptcy, insolvency, reorganization, moratorium, and other similar laws
      affecting or relating to the  enforcement of creditors'  rights  generally
      and by general  principles of equity  (whether  applied in a proceeding at
      law or in equity).

            (b) When the Related Agreements and the other instruments called for
      by this  Agreement  to  which  OmniAmerica  is a party  are  executed  and
      delivered at the Closing,  such Related  Agreements and other  instruments
      will have been duly authorized, executed and delivered by OmniAmerica, and
      will be, assuming the valid authorization,  execution and delivery thereof
      by each other  party  thereto  (except  OmniAmerica  and its  Affiliates),
      enforceable  against OmniAmerica in accordance with their terms, except as
      such enforcement may be limited by bankruptcy, insolvency, reorganization,
      moratorium,   and  other  similar  laws   affecting  or  relating  to  the
      enforcement of creditors'  rights  generally and by general  principles of
      equity (whether applied in a proceeding at law or in equity).

            (c) OmniAmericaSub has all necessary power and authority to execute,
      deliver and perform this Agreement,  the Related  Agreements and the other
      instruments  called  for by this  Agreement  to  which it is or is to be a
      party.  The  execution,  delivery  and  performance  of this  Agreement by
      OmniAmericaSub and the consummation by it of the transactions contemplated
      hereby have been duly and validly  authorized by all  necessary  corporate
      action on its part. This Agreement has been duly executed and delivered by
      OmniAmericaSub  and,  assuming  the  valid  authorization,  execution  and
      delivery  hereof  by STI and the Sub,  constitutes  the  legal,  valid and
      binding obligation of OmniAmericaSub, enforceable against it in accordance
      with its terms,  except as such  enforcement may be limited by bankruptcy,
      insolvency,  reorganization,  moratorium, and other similar laws affecting
      or relating to the  enforcement  of  creditors'  rights  generally  and by
      general principles of equity (whether applied in a proceeding at law or in
      equity).



                                     9



<PAGE>






            (d) When the Related Agreements and the other instruments called for
      by this  Agreement  to which  OmniAmericaSub  is a party are  executed and
      delivered at the Closing,  such Related  Agreements and  instruments  will
      have been duly authorized,  executed and delivered by OmniAmericaSub,  and
      will be, assuming the valid authorization,  execution and delivery thereof
      by each other party thereto (other than  OmniAmerica and its  Affiliates),
      enforceable  against it in  accordance  with their  terms,  except as such
      enforcement  may be limited  by  bankruptcy,  insolvency,  reorganization,
      moratorium,   and  other  similar  laws   affecting  or  relating  to  the
      enforcement of creditors'  rights  generally and by general  principles of
      equity (whether applied in a proceeding at law or in equity).

            4.1.4 Execution;  No Violations.  The execution and delivery of this
Agreement by each of OmniAmerica  and  OmniAmericaSub  do not, and the execution
and delivery of the Related Agreements to which they are parties and solely with
respect to OmniAmerica,  the execution and delivery of the HSW Merger Agreement,
the  consummation  of the  transactions  contemplated  hereby  and  thereby  and
compliance  with the provisions  hereof and thereof by each of  OmniAmerica  and
OmniAmericaSub  will not:  (a) violate,  conflict  with,  modify,  result in the
incurrence  of  any   prepayment   penalties  or  cause  any  default  under  or
acceleration,  termination  or  cancellation  of any obligation or the loss of a
benefit  under  (or  give  any  party  any  right  to  declare  any  default  or
acceleration  upon notice or passage of time or both),  in whole or in part, (i)
any provision of the  certificate of  incorporation  or bylaws of OmniAmerica or
OmniAmericaSub, (ii) any Lien, indenture, lease, loan or credit agreement, note,
bond,  mortgage or other  agreement  (other than,  with respect to  termination,
agreements  terminable  without material penalty either at will or upon 90 days'
or less  notice  by the  terminating  party),  obligation,  instrument,  permit,
concession,  franchise  or  license  applicable  to  OmniAmerica  or  any of the
OmniSubsidiaries  or (iii) assuming all the consents,  filings and registrations
referred  to in Section  4.1.5 are  obtained  or made,  any  order,  injunction,
decree,  or judgment to which  OmniAmerica or any of the  OmniSubsidiaries  is a
party or by which either of OmniAmerica or any of the OmniSubsidiaries or any of
their  respective  properties  is bound;  (b) result in the creation of any Lien
upon or right of first  refusal with  respect to any property or asset  (whether
real,  personal,  mixed,  tangible or  intangible)  of OmniAmerica or any of the
OmniSubsidiaries,  except  as may be  approved  by  STI,  (c)  assuming  all the
consents, filings and registrations referred to in Section 4.1.5 are obtained or
made,  violate any statute,  ordinance,  law, rule or  regulation  applicable to
OmniAmerica or any of the  OmniSubsidiaries,  or (d) permit any federal or state
regulatory  agency to impose any  restrictions  or  limitations of any nature on
OmniAmerica  or  any  of  the   OmniSubsidiaries  or  any  of  their  respective
activities,  except in the case of clauses  (a)(ii),  (b), (c) and (d), any such
violations,   conflicts,   modifications,   defaults,   accelerations,   rights,
restrictions, limitations or Liens that would not reasonably be expected to have
a Material Adverse Effect on OmniAmerica or OmniAmericaSub.




                                     10



<PAGE>






            4.1.5 Governmental and Other Consents.

            (a)  Except  for  filings  under  the HSR  Act,  the  filing  of the
      certificate  of merger  contemplated  by Section 1.3 and the filing of the
      certificate  of  merger  contemplated  by the  HSW  Merger  Agreement,  no
      consent,  approval  or  authorization  of,  or  designation,  declaration,
      registration  or filing with,  any domestic  (federal or state) or foreign
      court,  commission,  governmental body,  regulatory  agency,  authority or
      tribunal (a "Governmental  Entity") is required on the part of OmniAmerica
      or  OmniAmericaSub  in  connection  with the execution or delivery of this
      Agreement,  the Related  Agreements to which it is a party, the HSW Merger
      Agreement  solely with respect to OmniAmerica or the consummation by it of
      the  transactions  contemplated  hereby and  thereby,  except as would not
      reasonably be expected to have a Material Adverse Effect on OmniAmerica or
      OmniAmericaSub.

            (b)  The  Disclosure  Schedule  lists  all  consents,  approvals  or
      authorizations of third Persons required in connection with  OmniAmerica's
      and  OmniAmericaSub's  valid  execution,  delivery or  performance of this
      Agreement,  the  Related  Agreements  to which each is a party and the HSW
      Merger Agreement solely with respect to OmniAmerica or the consummation of
      any of the  transactions  contemplated  hereby or  thereby  on the part of
      OmniAmerica or OmniAmericaSub (collectively,  the "OmniAmerica Consents"),
      including but not limited to the consents  required  under the  Contracts,
      except,  in each  case,  as would not  reasonably  be  expected  to have a
      Material Adverse Effect on OmniAmerica or OmniAmericaSub.

            4.1.6 OmniAmerica Financial Statements.

            (a) (i) The Disclosure  Schedule contains true and correct copies of
      (A) the  consolidated  balance sheet for OmniAmerica at December 31, 1997,
      and the  related  statements  of profit and loss and cash flows  since the
      inception  of  OmniAmerica  and (B) the  balance  sheets  for  each of the
      Significant  Acquired  Businesses at December 31, 1997,  1996 and 1995 and
      the related  statements  of profit and loss and cash flows for each of the
      one-year  periods then ended and (ii) when  delivered  pursuant to Section
      5.2.1, similar financial statements to those described in clause (a)(i)(B)
      for  each  additional   month  ending  before  the  Closing  for  each  of
      OmniAmerica and the Significant  Acquired  Businesses  (collectively,  the
      "OmniAmerica Financial Statements").

            (b) The  OmniAmerica  Financial  Statements  have been  prepared  in
      accordance  with GAAP and  present  fairly in all  material  respects  the
      financial position of the Significant  Acquired Businesses and OmniAmerica
      as  of  the  dates  thereof  and  the  results  of  Significant   Acquired
      Businesses'  and  OmniAmerica's  operations and cash flows for the periods
      then  ended,  except  that  in  the  case  of  the  OmniAmerica  Financial
      Statements described in clause (a)(ii) above are also subject to recurring
      year-end  adjustments,  if any,  that are  normal  in nature  and  amount.
      OmniAmerica and the


                                     11



<PAGE>






      Significant Acquired Businesses maintain a system of accounting, including
      without  limitation a system of internal  controls,  which permits them to
      prepare   financial   statements  that  present  fairly  their  respective
      financial positions and results of operations in all material respects.

            4.1.7  Absence of Certain  Liabilities.  Except (a) for  liabilities
incurred in the ordinary course of business  consistent with past practice,  (b)
for transaction expenses not to exceed $650,000 incurred in connection with this
Agreement,  (c) for  liabilities  set forth on any balance sheet  (including the
notes  thereto)  included  in the  OmniAmerica  Financial  Statements,  (d)  for
liabilities incurred in connection with the OmniAmerica  Permitted  Transactions
and (e) for  liabilities  assumed  by  OmniAmericaSub  in  connection  with  the
acquisition  of the Acquired  Businesses,  as of December 31, 1997,  neither the
Acquired  Businesses,  OmniAmerica nor any of the  OmniSubsidiaries had incurred
any liabilities or obligations of any nature, whether or not accrued, contingent
or  otherwise,  and whether  due or to become due,  that would be required to be
reflected or reserved  against in a  consolidated  balance  sheet  (assuming the
consummation  prior  to  December  31,  1997 of the  acquisition  of each of the
Acquired   Businesses)  of  the  Acquired   Businesses,   OmniAmerica   and  the
OmniSubsidiaries  (including the notes thereto) prepared in accordance with GAAP
applying the same practices and procedures as were applied in the preparation of
the  OmniAmerica  Financial  Statements.  Prior to the Effective Time of the HSW
Merger,  OmniAmerica had not conducted and will not conduct any business,  other
than  holding  the  OmniAmericaSub  Common  Stock,  had no  and  will  incur  no
liabilities (whether fixed or contingent) whatsoever (other than its obligations
hereunder) and had no and will not have any employees.

            4.1.8  Absence of  Changes.  Except as  expressly  provided  in this
Agreement or in connection with the OmniAmerica  Permitted  Transactions,  since
December  31,  1997,   OmniAmerica  and  OmniAmericaSub   have  conducted  their
businesses  only in the  ordinary  course and in a manner  consistent  with past
practice and, since such date, there has not been:

            (a) Any change or aggregate of changes in the  condition  (financial
      or   otherwise),   business,   assets,   or  liabilities  of  any  of  the
      OmniSubsidiaries  that has had, or would  reasonably be expected to result
      in, a Material Adverse Effect on OmniAmerica;

            (b) Any change in the  capitalization  of  OmniAmerica or any of the
      OmniSubsidiaries,   including,   without   limitation,   the  issuance  by
      OmniAmerica or any of the  OmniSubsidiaries  of any shares of stock of any
      class,  any  subscriptions,  options,  warrants,  convertible  securities,
      rights, calls, agreements,  commitments or rights affecting or relating in
      any manner whatsoever to any equitable  interests in OmniAmerica or any of
      the OmniSubsidiaries;

            (c) Any purchase,  redemption or other acquisition by OmniAmerica or
      any of the  OmniSubsidiaries,  or any  commitment,  plan or  agreement  by
      OmniAmerica or


                                     12



<PAGE>






      any of the OmniSubsidiaries  to purchase,  redeem or otherwise acquire any
      shares of its capital stock or other equitable interests;

            (d) Any merger or consolidation or agreement to merge or consolidate
      by OmniAmerica or any of the OmniSubsidiaries  with another Person, or any
      purchase  of or  investment  in or  agreement  to  purchase  or  invest by
      OmniAmerica  or any of the  OmniSubsidiaries  in the  business  of another
      Person;

            (e) Any declaration,  payment or setting aside by OmniAmerica or any
      of the  OmniSubsidiaries  of any dividends or other  distributions  of any
      assets  of any kind  whatsoever  to its  stockholders  or other  equitable
      owners, except for ordinary salary payments for services actually rendered
      and reasonable expense reimbursements in the ordinary course of business;

            (f) Any amendment to the certificate of  incorporation  or bylaws or
      other   organizational   documents   of   OmniAmerica   or   any   of  the
      OmniSubsidiaries;

            (g) Any  increase in the  compensation  or rate of  compensation  or
      commission payable or to become payable by any of the  OmniSubsidiaries to
      any of its  directors,  officers,  salaried  employees  earning  more than
      $75,000  per annum,  salesmen or agents,  or any  General  Increase in the
      compensation or rate of  compensation  payable or to become payable to any
      of its hourly employees or salaried employees earning $75,000 per annum or
      less  ("General  Increase"  for  purposes  hereof  shall mean any increase
      (including by means of increased  bonuses)  applicable to a class or group
      of  employees  and  does  not  include  increases  granted  to  individual
      employees   for  merit,   length  of   service,   change  in  position  or
      responsibility, regularly scheduled salary increase or bonus in accordance
      with a general  incentive  plan or other  reasons  applicable  to specific
      employees and not generally to a class or group thereof), or any hiring of
      any  employee  at a  salary  in  excess  of  $75,000  per  annum,  or  any
      termination of any key employee or any employee whose  compensation was in
      excess of $75,000 per annum;

            (h) Any material change in any existing,  or adoption of or entering
      into  any new,  benefit  plan or  arrangement  (whether  written  or oral)
      affecting any of the officers, directors, employees, salesmen or agents of
      any of the  OmniSubsidiaries,  including,  without limitation,  any bonus,
      profit-sharing,  pension, deferred compensation,  severance or termination
      pay benefit, stock option, group life or health insurance or other similar
      plans, agreements or arrangements;

            (i)  Any  release,  cancellation,  modification  or  waiver  of  any
      financial obligation,  indebtedness,  liability or Lien in favor of any of
      the OmniSubsidiaries,  unless such obligation,  indebtedness, liability or
      Lien has been paid in full at the time of  release  or such as would  not,
      individually  or in  the  aggregate,  reasonably  be  expected  to  have a
      Material Adverse Effect on OmniAmerica;



                                     13



<PAGE>






            (j)  Any  waivers,   compromises   or  settlements  by  any  of  the
      OmniSubsidiaries  of any right or claim of any of the  OmniSubsidiaries in
      excess of $50,000 in the aggregate;  or any  institution or settlement of,
      or agreement to settle,  any litigation,  action or proceeding  before any
      Governmental Entity relating to any of the  OmniSubsidiaries or any of its
      properties;

            (k) Any mortgage,  pledge or other  subjection to any Lien or option
      of any property,  asset,  right or business of  OmniAmerica  or any of the
      OmniSubsidiaries,  other than  Permitted  Liens and those  incurred in the
      ordinary course of business and consistent with past practice;

            (l) Any assumptions or guarantees (except endorsements of negotiable
      instruments in the ordinary  course of business and  consistent  with past
      practice) by OmniAmerica or any of the OmniSubsidiaries of the obligations
      of any Person,  except in the ordinary  course of business and  consistent
      with past  practice,  but in no event in excess of  $50,000  when all such
      assumptions, guarantees and endorsements are aggregated;

            (m)  Any  payment  or  satisfaction  by  OmniAmerica  or  any of the
      OmniSubsidiaries  of any material  liability,  obligation or indebtedness,
      other than those  reflected on the  OmniAmerica  Financial  Statements and
      those incurred in the ordinary course of business and consistent with past
      practice;

            (n) Any loan, advance, or capital contribution to, or investment in,
      any Person in an  aggregate  amount in excess of $100,000  (excluding  any
      loan, advance or capital contribution to, or investment in, OmniAmerica or
      any  of  the  OmniSubsidiaries),  any  commitment  to  so  loan,  advance,
      contribute  capital or invest,  or any renewal,  refunding or extension of
      any existing loan, advance or investment made by OmniAmerica or any of the
      OmniSubsidiaries to any Person,  except in the ordinary course of business
      and consistent with past practice;

            (o) Any actions  taken or  transactions  entered  into by any of the
      OmniSubsidiaries involving more than $100,000 in the aggregate, other than
      in the ordinary course of business and consistent  with past practice,  or
      any capital  expenditures or commitments therefor in excess of $100,000 in
      the aggregate, other than in the ordinary course of business;

            (p) Any creations,  renewals,  material changes or terminations,  or
      any notice of any proposed renewal,  material change or termination of any
      contract,  agreement,  commitment,  obligation, lease or license involving
      more than  $5,000,000 in the aggregate or extending  beyond six (6) months
      from the date of this Agreement, to which any of the OmniSubsidiaries is a
      party or by which any of the OmniSubsidiaries or its properties are bound;



                                     14



<PAGE>






            (q) Any sale, assignment, lease, abandonment or other disposition by
      any of the OmniSubsidiaries of any real property, or any sale, assignment,
      transfer,   license,   lapse,   or  other   disposition   by  any  of  the
      OmniSubsidiaries  of any material  trademark,  trade name,  copyright  (or
      pending  application  for any material  trademark or copyright),  or other
      intangible asset;

            (r) Any sale,  assignment  or transfer of any  contract,  agreement,
      lease,  or asset by any of the  OmniSubsidiaries,  except in the  ordinary
      course of business and  consistent  with past  practice,  other than to an
      OmniSubsidiary;

            (s) Any general labor dispute, or threat of a general labor dispute,
      or any  attempt  or  threat  of any  attempt  by a union to  organize  any
      employees of any of the  OmniSubsidiaries who are not now covered under an
      existing union or collective bargaining agreement;

            (t) Any lapse of any material insurance policy or coverage of any of
      the OmniSubsidiaries, except for normal renewals and/or replacements;

            (u)  Any  failure  by  any  of  the  OmniSubsidiaries  to  replenish
      inventories and supplies in a normal and customary manner  consistent with
      prior practice;  any purchase commitment by any of the OmniSubsidiaries in
      excess of the normal,  ordinary and usual  requirements  of business or at
      any price in excess of the then current market price;

            (v) Any  material  damage,  destruction  or loss to the  business or
      properties  of any of the  OmniSubsidiaries,  whether  or not  covered  by
      insurance,  including, without limitation, any damage, destruction or loss
      as a result of fire, explosion, accident, earthquake, lightning, aircraft,
      vehicle,  smoke,  hail,  flood,  drought,  storm,  strike,  work stoppage,
      lockout,  sabotage,  embargo,   condemnation,   riot,  civil  disturbance,
      vandalism  or act of God or public enemy the result of which is a Material
      Adverse Effect on OmniAmerica;

            (w)  Any   granting   of   powers   of   attorney   by  any  of  the
      OmniSubsidiaries;  any material writing up or writing down of the carrying
      value of any of its assets;  any material  change in the  depreciation  or
      amortization policies or rates heretofore adopted; or

            (x) Any other material  action taken or transaction  entered into by
      any of the OmniSubsidiaries other than in the ordinary course of business.

      For purposes hereof, the "ordinary course of business" for OmniAmerica and
the  OmniSubsidiaries  shall  include  the  ordinary  course of  conduct  of the
Acquired Businesses since January 1, 1997.



                                     15



<PAGE>






            4.1.9 Taxes.

            (a) Each of OmniAmerica and the OmniSubsidiaries has duly and timely
      filed  all  required  federal,   state,   local  and  other  tax  returns,
      information returns,  notices and reports (including,  without limitation,
      income,  property,  sales, use, franchise,  capital stock,  excise,  value
      added,   employment,   withholding,   FICA,   medicare  and  unemployment)
      (collectively,  "Tax  Returns")  related  to  OmniAmerica  and  any of the
      OmniSubsidiaries  heretofore  due,  and all such Tax Returns are  correct,
      accurate and complete in all material respects;

            (b) All  deposits  of  estimated  income and  withholding,  FICA and
      medicare  Taxes  required  to be  made  by  OmniAmerica  and  any  of  the
      OmniSubsidiaries have been duly and timely made;

            (c) There has not been  during the past five (5) years any audits or
      examinations  of  any  tax  returns  filed  by  OmniAmerica  or any of the
      OmniSubsidiaries,  no audits or judicial or administrative proceeding with
      respect to any Taxes due from  OmniAmerica or any of the  OmniSubsidiaries
      are in progress,  and neither OmniAmerica nor any of the  OmniSubsidiaries
      have been notified by any tax authority that any such audits, examinations
      or proceedings are contemplated or pending;

            (d)  All  Taxes  with   respect  to   OmniAmerica   or  any  of  the
      OmniSubsidiaries  that have become due and  payable on or before  December
      31, 1997 have been timely paid in full or adequately  reserved  against in
      accordance  with GAAP on the  OmniAmerica  Financial  Statements,  and all
      Taxes which have become due and payable  subsequent  to December  31, 1997
      have  been paid in full or  adequately  reserved  against  on its books of
      account and the amounts reflected on the OmniAmerica  Financial Statements
      and such books are  sufficient  for the  payment of all unpaid  Taxes with
      respect to the periods then ended and for all periods prior thereto. There
      are  no  Liens  on  any  of  the  assets  of  OmniAmerica  or  any  of the
      OmniSubsidiaries  that arose in  connection  with any  failure (or alleged
      failure) to pay any Tax,  except those that are not yet due and payable or
      are being contested in good faith by appropriate proceedings;

            (e) There are no agreements, waivers or other arrangements providing
      for an extension of time with respect to the  assessment  or collection of
      any Tax against OmniAmerica or any of the OmniSubsidiaries,  nor are there
      any  actions,  suits,  proceedings,  investigations  or claims now pending
      against OmniAmerica or any of the  OmniSubsidiaries in respect of any Tax,
      or any matters under discussion with any federal,  state, local or foreign
      authority,  or  any  claims  for  refund  by  OmniAmerica  or  any  of the
      OmniSubsidiaries  for overpaid Taxes relating to any Taxes,  or any claims
      for additional Taxes asserted by any such authority, and there is no basis
      for the assertion of any  additional  Taxes against  OmniAmerica or any of
      the OmniSubsidiaries;



                                     16



<PAGE>






            (f)  The  consummation  of the  transactions  contemplated  by  this
      Agreement  will not result in the  imposition of any  additional  Taxes on
      OmniAmerica or any of the  OmniSubsidiaries,  except for Taxes relating to
      the consummation of OmniAmerica Permitted Transactions;

            (g) Each of the  OmniSubsidiaries  has  withheld  and paid all Taxes
      required to have been withheld and paid in connection with amounts paid or
      owing to any  employee,  creditor,  independent  contractor or other third
      party;

            (h)  None of the  OmniSubsidiaries  is a party to any  "safe  harbor
      lease" that is subject to the provisions of Section  168(f)(8) of the Code
      as in effect  prior to the Tax  Reform Act of 1986,  or to any  "long-term
      contract" within the meaning of Section 460 of the Code;

            (i)  There  are no  accounting  method  changes  in  effect or being
      requested with respect to OmniAmerica or any of the OmniSubsidiaries  that
      could give rise to an adjustment under Section 481 of the Code for periods
      after the Closing Date;

            (j) Each of OmniAmerica and the  OmniSubsidiaries  has disclosed (in
      accordance  with  Section  6662(d)(2)(B)(ii)  of the Code) on its  federal
      income tax returns all  positions  taken therein that could give rise to a
      substantial  understatement  of federal  income tax within the  meaning of
      Section 6662(d) of the Code; and

            (k) For purposes of this  Agreement,  all  references to sections of
      the Code shall include any predecessor provisions to such sections and any
      similar provisions of state, local or foreign law.

            4.1.10 Disputes and Litigation.  (a) There is no suit,  arbitration,
action, litigation,  proceeding,  investigation,  claim, complaint or accusation
pending (the "Proceedings") of which OmniAmerica or any of the  OmniSubsidiaries
has received  written  notice or, to the  Knowledge of  OmniAmerica  Management,
threatened against or affecting  OmniAmerica or any of the  OmniSubsidiaries  or
any of their properties,  assets or businesses or to which OmniAmerica or any of
the  OmniSubsidiaries  is a party,  in any court or before any arbitrator of any
kind or before or by any Governmental Entity (including, without limitation, any
federal,  state, local,  foreign or other governmental  department,  commission,
board, bureau, agency or instrumentality),  the result of which, individually or
in the aggregate,  would  reasonably be expected to result in a Material Adverse
Effect on OmniAmerica;  (b) to the Knowledge of OmniAmerica Management, there is
no pending or threatened  change in any  Environmental Law or zoning or building
laws, regulations or ordinances the result of which would reasonably be expected
to result in a  Material  Adverse  Effect  on  OmniAmerica;  and (c) there is no
outstanding order, writ, injunction, decree, judgment, determination or award by
any court, arbitrator or Governmental Entity against or affecting OmniAmerica or
any of the  OmniSubsidiaries  or any of their  properties,  assets or businesses
which  would  reasonably  be  expected  to have a  Material  Adverse  Effect  on
OmniAmerica. None of the items nor


                                     17



<PAGE>






aggregate  of items  listed  in the  Disclosure  Schedule  would,  if  adversely
determined,  reasonably  be  expected  to  have a  Material  Adverse  Effect  on
OmniAmerica. To the Knowledge of OmniAmerica Management, there is no Proceeding,
formal or informal,  pending or threatened which would give rise to any right of
indemnification  on the part of any director or officer of OmniAmerica or any of
the OmniSubsidiaries.

            4.1.11 Compliance with Laws. Each of the OmniSubsidiaries  presently
is, and has at all times been, in  compliance in all material  respects with any
applicable federal,  state, local, foreign and other laws, rules and regulations
(including,  without  limitation,  EIA  wind-loading  and other EIA standards as
adopted  in  the  local  building  code  for  towers,  and  FAA,  FCC  and  OSHA
regulations),  other than those  where  noncompliance  would not  reasonably  be
expected  to have a  Material  Adverse  Effect on  OmniAmerica,  and none of the
OmniSubsidiaries  has received any written or, to the  Knowledge of  OmniAmerica
Management,  oral  notice of any  claimed  violation  of any such  law,  rule or
regulation  which would reasonably be expected to have a Material Adverse Effect
on OmniAmerica.  Except with respect to the matters  addressed in Section 4.1.9,
each of the OmniSubsidiaries has filed all returns,  reports and other documents
and furnished all information required or requested by any federal, state, local
or foreign  governmental  or  quasi-governmental  agency  and all such  returns,
reports,  documents and information are true and complete in all respects except
where such failure to file or  inaccuracies  would not reasonably be expected to
result in a Material  Adverse  Effect on  OmniAmerica.  All  permits,  licenses,
orders,  franchises  and  approvals  of all  federal,  state,  local and foreign
governmental or  quasi-governmental or regulatory bodies required of each of the
OmniSubsidiaries for the conduct of its business have been obtained,  other than
those where  noncompliance  would not  reasonably be expected to have a Material
Adverse  Effect on  OmniAmerica,  no  violations  are or have been  recorded  in
respect of any such permits,  licenses,  orders,  franchises and approvals,  and
there is no  Proceeding,  formal or  informal,  pending or, to the  Knowledge of
OmniAmerica  Management,  threatened,  which may revoke,  limit, or question the
validity,  sufficiency  or  continuance  of any  such  permit,  license,  order,
franchise or approval,  except in each case where the same would not  reasonably
be expected to have a Material  Adverse  Effect on  OmniAmerica.  Such  permits,
licenses,  orders,  franchises  and approvals are valid and  sufficient  for all
activities presently carried on by each of the OmniSubsidiaries,  except in each
case where the same would not reasonably be expected to have a Material  Adverse
Effect on OmniAmerica. None of the OmniSubsidiaries,  nor any officer, director,
employee,  stockholder  or agent  of the  OmniSubsidiaries  has made any  offer,
payment,  promise to pay, or authorization  of the payment of any money,  offer,
gift, promise to give, or authorization of anything of value to any Person named
or  identified  in Section  30A of the  Exchange  Act for any  unlawful  purpose
described in Section 30A of the Exchange Act.  Notwithstanding  anything in this
Section  4.1.11 to the  contrary,  no  representation  is made by  OmniPartners,
OmniAmerica or any of the  OmniSubsidiaries  concerning its compliance with Rule
10b-5 as promulgated  under the Exchange Act in connection  with the sale of the
OmniAmerica Shares pursuant to this Agreement.

            4.1.12  Insurance.  The  Disclosure  Schedule  sets forth a true and
complete list of all insurance  policies  (including the policy number, the name
of the insurer,


                                     18



<PAGE>






the  amounts  of  coverage,  the  premium  rate,  the cash  value,  if any,  the
expiration date and the risks and losses insured against)  currently  maintained
by each of the OmniSubsidiaries on its properties,  assets, products, businesses
and  personnel,  and  OmniAmerica  shall  deliver  copies of all such  policies,
agreements,  studies and analyses to STI not later than seven (7) days after the
date of this  Agreement.  All of the  foregoing  insurance  policies are in full
force and effect and are fully paid as to all premiums  heretofore  due. None of
the OmniSubsidiaries has failed to give any notice, if the failure thereof would
reasonably  be expected to have a Material  Adverse  Effect on  OmniAmerica,  or
present any material claim under such insurance policies in timely fashion,  nor
has  any  of the  OmniSubsidiaries  received  any  written  notification  of the
cancellation  of any of such  policies  or that any of them will not be renewed,
except as to such cancellations as would not,  individually or in the aggregate,
reasonably be expected to have a Material Adverse Effect on OmniAmerica.

            4.1.13  Title  to  Properties.  The  properties  and  assets  of the
OmniSubsidiaries  consist of (a) all of the properties  and assets  reflected on
the OmniAmerica Financial Statements as owned by them and (b) all other material
properties and assets presently carried on  OmniSubsidiaries'  books as owned by
them or used in their businesses,  except,  in each case,  properties and assets
licensed  or  leased  by any of the  OmniSubsidiaries  or as to which any of the
OmniSubsidiaries otherwise has the right to use and assets subsequently disposed
of in the ordinary course of business. Each of the OmniSubsidiaries has good and
indefeasible title to all of its respective properties and assets (whether real,
personal,  mixed,  tangible  or  intangible)  owned by it free and  clear of all
Liens,  except  Permitted  Liens,  if  any.  To  the  Knowledge  of  OmniAmerica
Management,  the Towers and any  improvements  thereto are in good condition and
repair,  ordinary  wear and tear  excepted,  and do not have any  structural  or
material  defects,  except where the failure to be in such condition  would not,
individually  or in the  aggregate,  reasonably  be  expected to have a Material
Adverse Effect on OmniAmerica.

            4.1.14  Real  Property  and Real  Property  Leases.  The  Disclosure
Schedule contains a true and complete list of (a) all real property owned by the
OmniSubsidiaries,   (b)  all  real   estate   leases   to   which   any  of  the
OmniSubsidiaries  is a party, and (c) all other material  interests,  if any, in
real property owned or claimed by any of the OmniSubsidiaries.  To the Knowledge
of OmniAmerica  Management,  each of the OmniSubsidiaries has material easements
and rights, including parking rights and easements for power lines, water lines,
roadways and other access,  necessary to conduct the  businesses it now conducts
and enjoys peaceful and undisturbed possession of all properties occupied by it.
To the Knowledge of OmniAmerica Management, neither the whole nor any portion of
any real property owned, occupied or leased to or by any of the OmniSubsidiaries
has been  adversely  rezoned  or  condemned  or  otherwise  taken by any  public
authority  and, to the Knowledge of  OmniAmerica  Management,  no such rezoning,
condemnation or other taking is threatened or contemplated.  To the Knowledge of
OmniAmerica Management, none of the real properties owned, occupied or leased to
or by  any of  the  OmniSubsidiaries  or the  occupancy  or  operation  thereof,
constitutes a nuisance or violation of any law or any building,  zoning or other
ordinance, code or regulation or any private or public covenant or restriction,


                                     19



<PAGE>






and no written  notice  from any  Governmental  Entity or other  Person has been
served upon any of the  OmniSubsidiaries  or any Person who had previously owned
the Acquired  Businesses  during the  two-year  period prior to the date of this
Agreement claiming any outstanding  violation of any such law, ordinance,  code,
regulation,  covenant or restriction,  or requiring or calling  attention to the
need for any material  amount of work,  repairs,  construction,  alterations  or
installations on or in connection with any of such properties which has not been
complied with, except as such that would not,  individually or in the aggregate,
reasonably be expected to have a Material  Adverse  Effect on  OmniAmerica.  All
leases  of real  property  to which any of the  OmniSubsidiaries  is a party are
valid,  binding  and in full force and  effect,  and,  there  exists no material
default  thereunder  by any of the  OmniSubsidiaries  or,  to the  Knowledge  of
OmniAmerica  Management,  any other party  thereto,  nor any events which,  with
notice or lapse of time, or both,  would constitute a material default by any of
the  OmniSubsidiaries  thereunder,  and all rents heretofore  payable under such
leases have been paid in full. Each of the OmniSubsidiaries shall deliver to STI
not later than seven (7) days after the date of this  Agreement,  true,  correct
and complete copies of all deeds, title commitments, title policies, and surveys
to the real property  listed on the  Disclosure  Schedule and true,  correct and
complete  copies of all real estate  leases listed on the  Disclosure  Schedule,
including all  amendments,  modifications,  letter  agreements  and  assignments
relating thereto.

            4.1.15  Intangible Personal Property.

            (a) The Disclosure Schedule contains a true and complete list of all
      material  trademarks,  service  marks,  trade  names  (including  the name
      "OmniAmerica"  and  all  derivations   thereof  used  by  OmniAmericaSub),
      patents,   copyrights  and   applications   for  the  foregoing  owned  by
      OmniAmericaSub (collectively, the "OmniAmericaSub Intellectual Property"),
      all material  licenses to which  OmniAmericaSub is a licensor or licensee,
      and all non-competition covenants of OmniAmericaSub. OmniAmericaSub is the
      sole and  exclusive  owner  of the  OmniAmericaSub  Intellectual  Property
      indicated on the  Disclosure  Schedule to be owned by it free and clear of
      all Liens,  except  Permitted  Liens, if any, and has the right to use the
      OmniAmericaSub  Intellectual Property,  having not granted or entered into
      any agreement, covenant, license or sublicense with respect thereto.

            (b) No written  claims or demands have been asserted  against any of
      the   OmniSubsidiaries   with   respect  to  any  of  the   OmniAmericaSub
      Intellectual  Property,  and no  Proceedings  have  been  instituted,  are
      pending or, to the Knowledge of OmniAmerica Management, threatened against
      OmniAmericaSub  which challenge the rights of OmniAmericaSub  with respect
      to any of such assets.  To the Knowledge of  OmniAmerica  Management,  the
      businesses and operations of OmniAmericaSub  and the use or publication of
      the OmniAmericaSub  Intellectual Property does not involve infringement or
      claimed infringement of any United States trademark, trade name, copyright
      or patent.



                                     20



<PAGE>






            (c) No director,  officer or  stockholder,  or, to the  Knowledge of
      OmniAmerica Management, employee, consultant, distributor, representative,
      advisor,  salesman or agent of any of the OmniSubsidiaries  owns, directly
      or  indirectly,  in whole or in part,  any  trademarks,  trade  names,  or
      copyrights,  or applications for the foregoing, or other material tangible
      personal  property which  OmniAmericaSub  is presently using or the use of
      which is necessary for the business of any of the  OmniSubsidiaries as now
      conducted.  None of the directors,  officers or stockholders of any of the
      OmniSubsidiaries has entered into any agreement regarding know-how,  trade
      secrets, or prohibition or restriction of competition,  or solicitation of
      customers or any other similar restrictive agreement or covenant,  whether
      written or oral, with any Persons other than the OmniSubsidiaries.

            4.1.16  Agreements.  The  Disclosure  Schedule  contains  a true and
complete  list of all (i) oral  contracts,  leases,  and  licenses the breach of
which would  result in a Material  Adverse  Effect on  OmniAmerica  and (ii) all
written contracts, leases, and licenses, (collectively, the "Contracts") in each
case to which any of the  OmniSubsidiaries  is a party or its  properties may be
bound and which  (a)  involve  obligations  by any  party  thereto  in excess of
$250,000;  (b) require the consent of any party thereto to the  consummation  of
the transactions  contemplated by this Agreement or the Related Agreements;  (c)
contain covenants limiting the freedom of any of the OmniSubsidiaries to compete
in any line of  business  or with any Person or in any  geographical  area;  (d)
contain  any  provision  or option  relating  to the  acquisition  by any of the
OmniSubsidiaries  of  any  business  or  relating  to  the  sale  by  any of the
OmniSubsidiaries  of any  business,  other  than  pursuant  to  the  OmniAmerica
Permitted  Transactions;  (e) contain an agreement or  commitment  by any of the
OmniSubsidiaries  for a material  capital  expenditure,  other than  OmniAmerica
Permitted  Transactions;  or (f) are contracts or agreements to which the United
States  government  is a party;  provided,  that  notwithstanding  the foregoing
provisions of this Section  4.1.16,  the Disclosure  Schedule need not list, and
the term "Contracts" shall not include,  agreements for which the obligations of
the parties thereto have been fulfilled.  All of the Contracts were entered into
by the  OmniSubsidiary  that  is a  party  thereto  in the  ordinary  course  of
business,  are valid  and  binding  and in full  force and  effect  against  the
OmniSubsidiary  that is a party  thereto and, to the  Knowledge  of  OmniAmerica
Management,  each of the other  parties  thereto,  and there  exists no material
breach or default by the  OmniSubsidiary  that is a party thereto,  or any event
which,  with notice or lapse of time or both, would constitute a material breach
or default by the OmniSubsidiary that is a party thereto, or to the Knowledge of
OmniAmerica Management, by any other party thereto. OmniAmericaSub shall deliver
to STI not later than seven (7) days after the date of this Agreement,  true and
complete  copies,  including  all  amendments,   modifications  and  assignments
relating  thereto,  of all of the  aforesaid  written  agreements  and  true and
correct summaries of all such oral agreements.

            4.1.17  Indebtedness  and Guaranties.  The Disclosure  Schedule sets
forth  a true  and  complete  list of all  promissory  notes,  loan  agreements,
security  agreements and guarantees  relating to indebtedness for borrowed money
or money  loaned to others  to which any of the  OmniSubsidiaries  is a party or
obligor. Neither OmniAmerica nor any of the


                                     21



<PAGE>






OmniSubsidiaries   has  an  existing   obligation  to  guarantee  any  dividend,
obligation  or  indebtedness  of any  Person  (except  for  the  endorsement  of
negotiable  instruments in the ordinary  course of business and consistent  with
past  practice).  All of the  aforesaid  items were entered into in the ordinary
course of  business,  are  valid and  binding  and in full  force and  effect as
against the OmniSubsidiary  that is a party thereto and there exists no material
breach or default by the  OmniSubsidiary  that is a party thereto,  or any event
which with notice or lapse of time or both,  would  constitute a material breach
or default by the OmniSubsidiary that is a party thereto or, to the Knowledge of
OmniAmerica Management, any other parties thereto.

            4.1.18 Debts to and from Related Parties. Except for the advancement
and  reimbursement of business  expenditures upon arms' length terms or pursuant
to valid  employment  agreements  or employee  health and benefit  plans,  there
presently is no  indebtedness  owing to any of the  OmniSubsidiaries  by, or any
contractual agreements between any of the OmniSubsidiaries, on the one hand, and
any stockholder,  director,  partner, or officer of any of the OmniSubsidiaries,
any  Family  Member  of  their  respective  families,  or to  the  Knowledge  of
OmniAmerica Management, any Affiliate or "associate" (as such term is defined in
Rule  405  of  the  Securities   Act)  of  any  of  the  foregoing   individuals
(collectively,  "OmniAmerica  Related Persons"),  on the other hand, and none of
the OmniAmerica  Related Persons owns any material property or rights,  tangible
or  intangible  (other  than  an  equitable  interest),   used  in  any  of  the
OmniSubsidiaries'  businesses.  Except as set forth in the OmniAmerica Financial
Statements   and   the   E&Y   Audited   Financial   Statements,   none  of  the
OmniSubsidiaries  is indebted to any OmniAmerica  Related Person,  in any amount
whatsoever,  other than, to the Knowledge of OmniAmerica Management, for payment
of salaries,  normal  fringe  benefits,  reimbursement  of  reasonable  business
expenditures and compensation for services  actually  rendered to OmniAmericaSub
in the ordinary course of their businesses.

            4.1.19 Certificate of Incorporation and Bylaws. Not later than three
(3) days after the date of this Agreement, OmniAmerica,  OmniAmericaSub and SATC
shall deliver to STI true and complete copies of their  respective  certificates
of  incorporation  and  bylaws as  currently  in  effect.  The  certificates  of
incorporation and bylaws were duly adopted and are in full force and effect, and
there are no  amendments  or  modifications  thereto  except as included in said
certificates of incorporation and bylaws. None of OmniAmerica, OmniAmericaSub or
SATC  is  in  violation  of  any  of  the  provisions  of  its   certificate  of
incorporation or bylaws.

            4.1.20  Books  and  Records.   The  minute  books  of   OmniAmerica,
OmniAmericaSub  and SATC contain  accurate records of all material actions taken
by the stockholders and directors of OmniAmerica, OmniAmericaSub or SATC, as the
case  may  be.  The  books,   records  and  accounts  of  OmniAmerica   and  the
OmniSubsidiaries,  all of which  have  been  made  available  to STI,  have been
maintained  in  accordance  with the  requirements  of Section  13(b)(2)  of the
Exchange Act  (regardless  of the fact that neither  OmniAmerica  nor any of the
OmniSubsidiaries   is  currently   subject  to  that  Section),   including  the
maintenance of an adequate system of internal  controls.  The stock  certificate
books and stock transfer ledgers


                                     22



<PAGE>






ofOmniAmerica,  OmniAmericaSub  and SATC are  correct and  complete  and reflect
accurately  the  number  of  shares  of  stock  held by  their  respective  sole
stockholders.

            4.1.21  Employee Benefits.

            (a) Neither OmniAmerica nor any of the  OmniSubsidiaries  maintains,
      administers,  or  contributes  to  or  has  maintained,  administered,  or
      contributed to (or had an obligation to maintain, administer or contribute
      to) or is a party  to (i) any  "employee  benefit  plan,"  as  defined  in
      Section  3(3) of  ERISA)  (the  "OmniAmerica  ERISA  Plans")  or (ii)  any
      employment or consulting, bonus or other incentive compensation,  deferred
      compensation,  salary continuation during any leave of absence, severance,
      stock award,  stock option,  stock purchase or fringe benefit  agreements,
      policies  or  arrangements,  whether  written or oral  (together  with the
      OmniAmerica ERISA Plans, the "OmniAmerica Plans").

            (b) None of the  OmniAmerica  Plans is subject to Title IV of ERISA.
      None of the OmniAmerica  Plans provides  retiree medical or life insurance
      benefits to any Person. None of the OmniAmerica Plans provides for payment
      of a  benefit,  the  increase  of  a  benefit  amount,  the  payment  of a
      contingent  benefit,  or the  acceleration  of the payment or vesting of a
      benefit by reason of the execution of this  Agreement or the  consummation
      of the transactions  contemplated by this Agreement.  Neither  OmniAmerica
      nor  OmniAmericaSub  has an obligation  to adopt,  or is  considering  the
      adoption of, any new  OmniAmerica  Plan or, except as required by law, the
      amendment of any existing  OmniAmerica  Plan. Each OmniAmerica  ERISA Plan
      intended to be qualified  under Section  401(a) of the Code has received a
      favorable  determination  letter from the Internal Revenue Service that it
      is so qualified and, to the Knowledge of OmniAmerica  Management,  nothing
      has  occurred  since the date of such  letter  that  could  reasonably  be
      expected to affect the qualified  status of such  OmniAmerica  ERISA Plan.
      OmniAmerica  Management  is  not  aware  of  any  claims  relating  to the
      OmniAmerica   Plans  (other  than  routine  claims  for  benefits).   Each
      OmniAmerica  Plan has been operated in all respects in accordance with its
      terms and the  requirements of all applicable law, except to the extent as
      would not  reasonably  be  expected to have a Material  Adverse  Effect on
      OmniAmerica.

Neither  OmniAmerica  nor any of the  OmniSubsidiaries  nor any  member of their
"controlled  group" has any withdrawal  liability,  under Title IV of ERISA, the
terms of the applicable plan, any collective  bargaining  agreement or any other
labor agreement or otherwise,  with respect to any "multi-employer" plan (within
the meaning of Section 3(37) or  4001(a)(3)  of ERISA) to which they  contribute
(or had any  obligation  to  contribute);  nor has  any  event  occurred  or any
circumstance  exist that  presents a risk of the  occurrence  of any  withdrawal
liability with respect to any such multi-employer plan.



                                     23



<PAGE>






            4.1.22  Employees.

            (a) The  Disclosure  Schedule sets forth a true and complete list of
      all collective  bargaining agreements to which any of the OmniSubsidiaries
      is a party.

            (b) To the Knowledge of OmniAmerica Management, OmniAmerica and each
      of the OmniSubsidiaries are in full compliance with all federal, state and
      local laws respecting  employment,  wages and hours in each case except to
      the extent as would not reasonably be expected to have a Material  Adverse
      Effect on OmniAmerica. To the Knowledge of OmniAmerica Management, each of
      the  OmniSubsidiaries  is in compliance in all material  respects with all
      applicable federal and state laws and regulations respecting  occupational
      safety and health standards other than those where noncompliance would not
      reasonably be expected to have a Material  Adverse Effect on  OmniAmerica,
      and none of the  OmniSubsidiaries has received written complaints from any
      federal or state agency or regulatory body alleging outstanding violations
      of any such laws and regulations which violations  would,  individually or
      in the aggregate, reasonably be expected to have a Material Adverse Effect
      on OmniAmerica.

            (c) To the Knowledge of OmniAmerica  Management,  except pursuant to
      applicable  law, the  employment  of all persons and officers  employed by
      each of the OmniSubsidiaries is terminable at will, without any penalty or
      severance obligation of any kind on the part of the employer. All material
      sums due for employee  compensation  and  benefits  and all vacation  time
      owing to any employees have been duly and adequately  accrued on the books
      of each of the  OmniSubsidiaries in accordance with GAAP. To the Knowledge
      of  OmniAmerica  Management,  all  employees of the  OmniSubsidiaries  are
      either  United  States  citizens or are  authorized  to be employed in the
      United States in accordance with all applicable laws.

            (d) None of the  OmniSubsidiaries has experienced since December 31,
      1996, any general labor troubles or strife,  work stoppages,  slowdowns by
      its  employees.  To the Knowledge of OmniAmerica  Management,  none of the
      OmniSubsidiaries  has  experienced  since  December  31, 1996 any union or
      collective  bargaining  organization efforts or negotiations,  or requests
      for negotiations, for any representation or any labor contract relating to
      any employees of the OmniSubsidiaries not covered by a union or collective
      bargaining agreement as of December 31, 1996.

            (e) Each of the  OmniSubsidiaries  subscribes  to,  or is  otherwise
      insured under, the worker's compensation or similar statute in each of the
      states in which it has employees with respect to such employees.

            4.1.23 No Conflicts of Interest.  The Disclosure Schedule sets forth
a list  of all  agreements  which  each of the  OmniSubsidiaries  has  with  its
directors,  officers,  employees,  consultants,  distributors,  representatives,
advisors,  salesmen and agents that prohibit or restrain such  individuals  from
competing with one or more of the OmniSubsidiaries


                                     24



<PAGE>






in their respective  businesses.  None of the OmniSubsidiaries owns, directly or
indirectly, a controlling interest in, any Person which is a customer, supplier,
competitor or potential competitor of one or more of the OmniSubsidiaries.

            4.1.24  Environmental Matters.

            (a)  To  the  Knowledge  of  OmniAmerica  Management,  each  of  the
      OmniSubsidiaries   has  been  and  is  in  material  compliance  with  all
      applicable  Environmental  Laws and  possesses  all  licenses,  permits or
      similar  authorizations  required under Environmental Laws for the conduct
      of its business as it is currently being conducted.

            (b)  None  of  the   OmniSubsidiaries   has   received  any  written
      communication   from   any   Person   that   alleges   that   any  of  the
      OmniSubsidiaries  is not in compliance with, or is liable under applicable
      Environmental Laws.

            (c) There is no Environmental  Claim pending or, to the Knowledge of
      OmniAmerica  Management,   overtly  threatened  (i)  against  any  of  the
      OmniSubsidiaries,   (ii)  against  any  Person  whose  liability  for  any
      Environmental  Claim any of the  OmniSubsidiaries  has retained or assumed
      either  contractually or, to the Knowledge of OmniAmerica  Management,  by
      operation  of law,  or (iii)  against  any real or  personal  property  or
      operations  which are now or, to the Knowledge of OmniAmerica  Management,
      have been previously owned,  leased,  operated or managed,  in whole or in
      part, based on activities conducted by any of the OmniSubsidiaries.

            (d)  None  of  the  OmniSubsidiaries  is  subject  to  any  material
      liabilities under  Environmental Laws and, to the Knowledge of OmniAmerica
      Management,  there are no facts,  circumstances or conditions  relating to
      the operations of the  OmniSubsidiaries  that could reasonably be expected
      to result in the  OmniSubsidiaries  incurring  material  liabilities under
      Environmental Laws.

            (e) There are no underground  storage tanks, no aboveground  storage
      tanks,  asbestos  or  asbestos-containing   materials  or  polychlorinated
      biphenyls  located on, under or at any property owned,  operated or leased
      by  any  of the  OmniSubsidiaries,  except  in  material  compliance  with
      Environmental Laws.

            (f)  OmniAmericaSub  has  made  available  to STI any  environmental
      reports,  audits or assessments on any real property currently or formerly
      owned or leased by any of the OmniSubsidiaries that are in the possession,
      custody or control of OmniAmerica.

            4.1.25  Licenses.  Each of the  OmniSubsidiaries  has all  licenses,
permits, approvals, authorizations,  exemptions, classifications,  registrations
and certificates  (including,  without  limitation,  all  registrations or other
filings with respect to the Towers required by the


                                     25



<PAGE>






FAA  and  FCC),  and all  consents  or  agreements  with  Governmental  Entities
(collectively "Licenses") necessary to conduct its business in the manner and to
the extent that it has been  conducted,  other than any  Licenses the failure of
which  to have  would  not,  individually  or in the  aggregate,  reasonably  be
expected  to have a  Material  Adverse  Effect on  OmniAmerica.  The  Disclosure
Schedule  contains a list of every  material  License.  All Licenses are in full
force  and  effect  and no  Proceedings  are  pending  or, to the  Knowledge  of
OmniAmerica   Management,   threatened  which  may  result  in  the  revocation,
modification,  non-renewal  or suspension of any of the Licenses,  the denial of
any pending application for a License,  the issuance of a cease and desist order
or the imposition of any  administrative  penalty or sanction,  other than those
which would not,  individually  or in the  aggregate,  reasonably be expected to
have a Material  Adverse Effect on  OmniAmerica.  There does not exist under any
License any default or violation,  or event which,  with notice or lapse of time
or both,  would  constitute  a  default  or  violation  or would  result  in the
withdrawal of such License,  other than defaults or violations  which would not,
individually  or in the  aggregate,  reasonably  be  expected to have a Material
Adverse  Effect on  OmniAmerica,  nor is there,  to the Knowledge of OmniAmerica
Management, any basis for assertion of any default or violation.

            4.1.26 No Solicitation or Negotiation.  Neither  OmniAmerica nor any
of the  OmniSubsidiaries  has made any agreement to sell the stock,  business or
substantially all of the assets of OmniAmerica or any of the OmniSubsidiaries to
another  Person,  or to merge,  consolidate  or combine  assets or  business  of
OmniAmerica or any of the  OmniSubsidiaries  with another Person (except for the
OmniAmerica Permitted Transactions) and is not currently engaged in negotiations
or discussions  concerning any other sale of the stock,  or the sale,  merger or
combination  of any  material  asset or  business of  OmniAmerica  or any of the
OmniSubsidiaries to or with another Person (except for the OmniAmerica Permitted
Transactions).

            4.1.27 Tower Space Leases. The Disclosure  Schedule contains a true,
correct and complete  summary of each material Tower Space Lease,  including the
name of the  lessee,  the term of the  lease  and the  monthly  revenue  derived
therefrom.  OmniAmerica  has made  available  to STI true,  correct and complete
copies of all of the  material  Tower Space  Leases.  Other than the Tower Space
Leases,  there are no  leases,  occupancies,  tenancies  or  licenses  in effect
pertaining  to a Tower,  and other than  lessees or tenants  under  Tower  Space
Leases,  to the  Knowledge  of  OmniAmerica  Management,  no  persons,  tenants,
licensees or entities occupy space on a Tower. There are no options or rights to
renew,  extend or  terminate  the Tower  Space  Leases or expand  any  leased or
licensed  premises,  except as shown in the Tower Space Leases.  The Tower Space
Leases and any guaranties  thereof are in full force and effect.  OmniAmericaSub
is the sole owner of the  landlord's or  licensor's  interest in the Tower Space
Leases.  As of the Closing Date and as contemplated  herein, no rents due under,
or other  interest  in,  any of the Tower  Space  Leases  will  have been  sold,
assigned or transferred by any of the  OmniSubsidiaries  or otherwise pledged or
encumbered in any way. Neither the landlord nor, to the Knowledge of OmniAmerica
Management,  any tenant or licensee is in material default under any Tower Space
Lease nor has  OmniAmerica or any of the  OmniSubsidiaries  received any written
notice from any tenant or licensee of any default


                                     26



<PAGE>






under its current Tower Space Lease or of any tenant's or licensee's termination
of its current Tower Space Lease in advance of the scheduled  expiration date of
its  Tower  Space  Lease  unless  such  defaults  or  terminations   would  not,
individually  and in the  aggregate,  reasonably  be expected to have a Material
Adverse  Effect on  OmniAmerica.  All of the  improvements  to be constructed by
OmniAmerica or any of the OmniSubsidiaries, if any, contemplated under the Tower
Space Leases or as required  therein or in any  collateral  agreement,  plans or
specifications  respecting the Tower Space Leases have been fully  completed and
paid for,  except for such of the  foregoing  the  failure to pay for would not,
individually  or in the  aggregate,  reasonably  be  expected to have a Material
Adverse Effect on OmniAmerica.

            4.1.28 KISCO Shares. OmniAmericaSub owns good and transferable title
to the KISCO Shares,  free and clear of any Liens.  The KISCO Shares are validly
issued,  fully paid and  nonassessable.  The Kline  Shareholders  Agreement is a
valid and binding  obligation  of KISCO and,  to the  Knowledge  of  OmniAmerica
Management,  Jerome C. Kline,  enforceable  against KISCO in accordance with its
terms,  except as such  enforcement  may be limited by  bankruptcy,  insolvency,
reorganization,  moratorium, and other similar laws affecting or relating to the
enforcement of creditors'  rights generally and by general  principles of equity
(whether applied in a proceeding at law or in equity).

      4.2 Representations and Warranties of OmniPartners.  To induce STI and the
Sub to enter into this Agreement and to consummate the transactions contemplated
hereby,  OmniPartners  represents and warrants to STI and the Sub as of the date
hereof as follows (each such  representation and warranty being qualified in its
entirety by the  disclosures  set forth in the Disclosure  Schedule,  which such
disclosures shall correspond to the following sections and subsections):

            4.2.1 Existence and Authority.

            (a) OmniPartners is a partnership  duly organized,  validly existing
      and in good standing under the laws of the State of Delaware. OmniPartners
      has all requisite  partnership  power and authority to own its  properties
      and  assets  and to  carry  on its  business  as it has  been and is being
      conducted,  except where the failure to be so  organized,  existing and in
      good standing or to have such power and authority would not,  individually
      or in the  aggregate,  reasonably  be expected to have a Material  Adverse
      Effect on OmniAmerica or OmniAmericaSub.

            (b) HM Partners is a partnership  duly organized,  validly  existing
      and in good standing under the laws of the State of Texas. HM Partners has
      all requisite  partnership  power and authority to own its  properties and
      assets and to carry on its business as it has been and is being conducted,
      except where the failure to be so organized, existing and in good standing
      or to have such  power and  authority  would not,  individually  or in the
      aggregate,  reasonably  be expected to have a Material  Adverse  Effect on
      OmniAmerica or OmniAmericaSub.



                                     27



<PAGE>






            (c) On the date of this Agreement prior to the Effective Time of the
      HSW Merger, Omni/HSW Acquisition is a corporation duly organized,  validly
      existing and in good standing under the laws of the State of Delaware.  On
      the date of this Agreement  prior to the Effective Time of the HSW Merger,
      Omni/HSW  Acquisition  has all requisite  corporate power and authority to
      own its  properties and assets and to carry on its business as it has been
      and is being  conducted,  except  where the  failure  to be so  organized,
      existing and in good  standing or to have such power and  authority  would
      not,  individually  or in the aggregate,  reasonably be expected to have a
      Material Adverse Effect on OmniAmerica or OmniAmericaSub.

            4.2.2 Validity and Authorization; Partnership Power and Authority.

            (a) OmniPartners has all necessary  partnership  power and authority
      to execute, deliver and perform this Agreement, the Related Agreements and
      the other instruments called for by this Agreement to which it is or is to
      be a party.  The execution,  delivery and performance of this Agreement by
      OmniPartners  and the  consummation by  OmniPartners  of the  transactions
      contemplated hereby have been duly and validly authorized by all necessary
      partnership  action on the part of OmniPartners  (subject to the filing of
      appropriate  merger documents as required by the DGCL). This Agreement has
      been duly executed and delivered by OmniPartners  and,  assuming the valid
      authorization,   execution  and  delivery  hereof  by  STI  and  the  Sub,
      constitutes  the legal,  valid and  binding  obligation  of  OmniPartners,
      enforceable  against  OmniPartners in accordance with its terms, except as
      such enforcement may be limited by bankruptcy, insolvency, reorganization,
      moratorium,   and  other  similar  laws   affecting  or  relating  to  the
      enforcement of creditors'  rights  generally and by general  principles of
      equity (whether applied in a proceeding at law or in equity).

            (b) When the Related Agreements and the other instruments called for
      by this  Agreement  to which  OmniPartners  is a party  are  executed  and
      delivered at the Closing,  such Related  Agreements and  instruments  will
      have been duly  authorized,  executed and delivered by  OmniPartners,  and
      will be, assuming the valid authorization,  execution and delivery thereof
      by each other party thereto (other than  OmniAmerica and its  Affiliates),
      enforceable against OmniPartners in accordance with their terms, except as
      such enforcement may be limited by bankruptcy, insolvency, reorganization,
      moratorium,   and  other  similar  laws   affecting  or  relating  to  the
      enforcement of creditors'  rights  generally and by general  principles of
      equity (whether applied in a proceeding at law or in equity).

            (c) HM Partners has all necessary partnership power and authority to
      execute, deliver and perform the Related Agreements to which it is to be a
      party. The  consummation by HM Partners of the  transactions  contemplated
      thereby have been duly and validly authorized by all necessary partnership
      action on the part of HM Partners. When the Related Agreements to which HM
      Partners  is a party are  executed  and  delivered  at the  Closing,  such
      Related Agreements will have been duly authorized,


                                     28



<PAGE>






      executed and  delivered by HM  Partners,  and will be,  assuming the valid
      authorization,  execution and delivery thereof by each other party thereto
      (other  than  OmniAmerica  and  its  Affiliates)  enforceable  against  HM
      Partners in accordance with their terms, except as such enforcement may be
      limited by bankruptcy, insolvency,  reorganization,  moratorium, and other
      similar laws affecting or relating to the enforcement of creditors' rights
      generally  and by  general  principles  of equity  (whether  applied  in a
      proceeding at law or in equity).

            (d)  Omni/HSW  Acquisition  has all  necessary  corporate  power and
      authority to execute,  deliver and perform the HSW Merger  Agreement.  The
      consummation  by Omni/HSW  Acquisition  of the  transactions  contemplated
      thereby have been duly and validly  authorized by all necessary  corporate
      action on the part of Omni/HSW Acquisition.

            4.2.3 Execution; No Violations.

            (a)  OmniPartners'  execution and delivery of this Agreement do not,
      and the execution and delivery of the Related  Agreements to which it is a
      party,  the  consummation  of the  transactions  contemplated  hereby  and
      thereby  and  compliance  with  the  provisions   hereof  and  thereof  by
      OmniPartners  will not:  (i) violate,  conflict  with or cause any default
      under (or give any party any right to declare any  default  upon notice or
      passage of time or both),  in whole or in part,  any  limited  partnership
      agreement,  indenture, lease, agreement,  instrument, and assuming all the
      consents,  filings  and  registrations  referred  to in Section  4.2.4 are
      obtained  or made,  any order,  injunction,  decree,  or judgment to which
      OmniPartners is a party or by which  OmniPartners or any of its properties
      is bound,  (ii) result in the  creation of any Lien upon or right of first
      refusal  with respect to any property or asset  (whether  real,  personal,
      mixed,   tangible   or   intangible)   of   OmniAmerica   or  any  of  the
      OmniSubsidiaries  except as may be approved by STI, (iii) assuming all the
      consents,  filings  and  registrations  referred  to in Section  4.2.4 are
      obtained or made, violate any statute,  ordinance, law, rule or regulation
      applicable to OmniPartners,  OmniAmerica or any of the OmniSubsidiaries or
      any of their respective properties or assets or (iv) permit any federal or
      state  regulatory  agency to impose any restrictions or limitations of any
      nature  on  OmniAmerica  or  any  of  the  OmniSubsidiaries  or any of its
      activities,  except in the case of clauses (ii),  (iii) and (iv), any such
      violations, conflicts,  modifications,  defaults,  accelerations,  rights,
      restrictions, limitations or Liens that would not, individually, or in the
      aggregate,  reasonably  be expected to have a Material  Adverse  Effect on
      OmniAmerica or OmniAmericaSub.

            (b) HM  Partners'  execution  and  delivery  of each of the  Related
      Agreements to which it is a party,  the consummation by HM Partners of the
      transactions  contemplated  thereby  and  compliance  with the  provisions
      thereof by HM Partners  will not: (i) violate,  conflict with or cause any
      default  under (or give any party any right to declare  any  default  upon
      notice or passage of time or both), in whole or in part, any


                                     29



<PAGE>






      limited partnership agreement,  indenture,  lease, agreement,  instrument,
      and assuming all the consents,  filings and  registrations  referred to in
      Section  4.2.4 are obtained or made,  any order,  injunction,  decree,  or
      judgment to which HM Partners is a party or by which HM Partners or any of
      its  properties is bound,  (ii) result in the creation of any Lien upon or
      right of first  refusal  with  respect to any  property or asset  (whether
      real,  personal,  mixed,  tangible or intangible) of OmniAmerica or any of
      the OmniSubsidiaries  except as may be approved by STI, (iii) assuming all
      the consents,  filings and registrations  referred to in Section 4.2.4 are
      obtained or made, violate any statute,  ordinance, law, rule or regulation
      applicable to HM Partners,  OmniAmerica or any of the  OmniSubsidiaries or
      any of their respective properties or assets or (iv) permit any federal or
      state  regulatory  agency to impose any restrictions or limitations of any
      nature  on  OmniAmerica  or  any  of  the  OmniSubsidiaries  or any of its
      activities,  except in the case of clauses (ii),  (iii) and (iv), any such
      violations, conflicts,  modifications,  defaults,  accelerations,  rights,
      restrictions, limitations or Liens that would not, individually, or in the
      aggregate,  reasonably  be expected to have a Material  Adverse  Effect on
      OmniAmerica or OmniAmericaSub.

            (c) Omni/HSW Acquisition's  execution and delivery of the HSW Merger
      Agreement,  the  consummation by Omni/HSW  Acquisition of the transactions
      contemplated  thereby  and  compliance  with  the  provisions  thereof  by
      Omni/HSW  Acquisition  will not: (i) violate,  conflict  with or cause any
      default  under (or give any party any right to declare  any  default  upon
      notice or passage of time or both),  in whole or in part, any  certificate
      of incorporation,  indenture,  lease,  agreement,  instrument,  any order,
      injunction,  decree, or judgment to which Omni/HSW  Acquisition is a party
      or by which Omni/HSW  Acquisition or any of its properties is bound,  (ii)
      result in the  creation  of any Lien upon or right of first  refusal  with
      respect to any property or asset (whether real, personal,  mixed, tangible
      or intangible) of OmniAmerica or any of the OmniSubsidiaries except as may
      be approved by STI,  (iii)  violate any statute,  ordinance,  law, rule or
      regulation applicable to Omni/HSW  Acquisition,  OmniAmerica or any of the
      OmniSubsidiaries  or any of their respective  properties or assets or (iv)
      permit any federal or state  regulatory  agency to impose any restrictions
      or limitations of any nature on OmniAmerica or any of the OmniSubsidiaries
      or any of its  activities,  except in the case of clauses (ii),  (iii) and
      (iv),   any   such   violations,   conflicts,   modifications,   defaults,
      accelerations,  rights,  restrictions,  limitations or Liens that as would
      not, individually,  or in the aggregate,  reasonably be expected to have a
      Material Adverse Effect on OmniAmerica or OmniAmericaSub.

            4.2.4 Governmental and Other Consents.

            (a)  Except  for  filings  under  the HSR Act and the  filing of the
      certificate of merger contemplated by Section 1.3, no consent, approval or
      authorization  of, or  designation,  registration,  declaration  or filing
      with, any  Governmental  Entity is required on the part of OmniPartners in
      connection with the execution or delivery of this  Agreement,  the Related
      Agreements to which it is a party or the consummation by it of


                                     30



<PAGE>






      the  transactions  contemplated  hereby and  thereby,  except as would not
      reasonably be expected to have a Material Adverse Effect on OmniAmerica or
      OmniAmericaSub.  No consent, approval or authorization of, or designation,
      registration,  declaration  or filing  with,  any  Governmental  Entity is
      required on the part of HM Partners in  connection  with its  execution or
      delivery  of  the  Related  Agreements  to  which  it is a  party  or  the
      consummation by it of the  transactions  contemplated  thereby,  except as
      would not  reasonably  be  expected to have a Material  Adverse  Effect on
      OmniAmerica or OmniAmericaSub.

            (b)  The  Disclosure  Schedule  lists  all  consents,  approvals  or
      authorizations   of  third  Persons   required  in  connection   with  (i)
      OmniPartners'  valid execution,  delivery or performance of this Agreement
      and the Related  Agreements to which it is a party or the  consummation of
      any of the  transactions  contemplated  hereby or  thereby  on the part of
      OmniPartners   and  (ii)  HM  Partners'  valid   execution,   delivery  or
      performance  of the  Related  Agreements  to  which  it is a party  or the
      consummation of any of the transactions  contemplated  thereby on the part
      of HM Partners  (collectively,  the "OmniPartners  Consents"),  except, in
      each case, as would not reasonably be expected to have a Material  Adverse
      Effect on OmniAmerica or OmniAmericaSub.

            4.2.5 Investment Intent; Compliance with Securities Laws.

            (a)   OmniPartners  is  acquiring  the  Merger   Consideration   for
      investment  for its own  account,  not as a nominee or agent for any other
      Person,  and not with a view to the  resale  or  distribution  of any part
      thereof in violation of the Securities Act. OmniPartners does not have any
      present intention of selling,  granting any participation in, or otherwise
      distributing  the  Merger  Consideration  otherwise  than  pursuant  to an
      effective  registration  statement  under  the  Securities  Act  or  in  a
      transaction exempt from the registration requirements under the Securities
      Act and  applicable  state  securities  laws.  Except  as set forth in the
      Stockholders   Agreements,   OmniPartners  does  not  have  any  contract,
      undertaking, agreement or arrangement with any Person to sell, transfer or
      grant  participations to such Person or to any third Person,  with respect
      to any of the Merger Consideration.

            (b)   OmniPartners  acknowledges  that  the issuance  of the  Merger
      Consideration will not be registered under the Securities Act or any state
      securities  laws on the  basis  of a  claimed  exemption  by STI  that the
      issuance of the Merger Consideration as provided for herein is exempt from
      registration  under the  Securities  Act and such state  securities  laws.
      OmniPartners  acknowledges  that the  availability  of such  exemptions is
      predicated  in part on  OmniPartners'  representations  set  forth in this
      Section and that STI and the Sub are relying on such representations.

            (c)  OmniPartners  has  received  all the  information  it considers
      necessary  or  appropriate  for  deciding  whether  to accept  the  Merger
      Consideration. OmniPartners has had an opportunity to ask questions and to
      receive answers from STI regarding the


                                     31



<PAGE>






      terms and conditions of the issuance of the Merger  Consideration  and the
      business,  properties,  and  financial  condition  of STI  and  to  obtain
      additional  information  (to the extent STI possessed such  information or
      could  acquire it without  unreasonable  effort or expense)  necessary  to
      verify  the  accuracy  of  any   information   furnished  to  OmniPartners
      (including the  representations  and warranties of STI and the Sub herein)
      or to which OmniPartners had access.

            (d) OmniPartners  acknowledges  that it is able to bear the economic
      risk of the investment in the Merger Consideration, and has such knowledge
      and  experience  in financial  and business  matters that it is capable of
      evaluating   the  merits  and  risks  of  the  investment  in  the  Merger
      Consideration.

            (e) OmniPartners is an Accredited Investor as defined in Rule 501(a)
      of Regulation D promulgated under the Securities Act.

            (f) OmniPartners  acknowledges that the Merger  Consideration or any
      portion  thereof may not be sold,  transferred  or  otherwise  disposed of
      without  registration under the Securities Act or an applicable  exemption
      therefrom and that in the absence of an effective  registration  statement
      covering  the  Merger   Consideration  or  an  available   exemption  from
      registration  under the Securities Act, the Merger  Consideration  must be
      held  indefinitely.  OmniPartners  further  acknowledges  that the  Merger
      Consideration  may not be sold pursuant to Rule 144 promulgated  under the
      Securities Act unless all of the conditions of that rule are met.

            (g) OmniPartners acknowledges that each certificate representing any
      of the Merger  Consideration will be endorsed with a legend  substantially
      similar to the following:

                  THE  SECURITIES  REPRESENTED  HEREBY HAVE NOT BEEN  REGISTERED
                  UNDER THE  SECURITIES  ACT OF 1933,  AS AMENDED,  OR ANY STATE
                  SECURITIES LAWS, AND MAY NOT BE SOLD OR TRANSFERRED  UNLESS SO
                  REGISTERED  OR UNLESS THE COMPANY  HAS  RECEIVED AN OPINION OF
                  COUNSEL  OR OTHER  EVIDENCE,  REASONABLY  SATISFACTORY  TO THE
                  COMPANY  AND  ITS  COUNSEL,  THAT  SUCH  REGISTRATION  IS  NOT
                  REQUIRED.

      4.3   Representations  and  Warranties  of  STI.  To  induce  OmniAmerica,
OmniAmericaSub  and  OmniPartners to enter into this Agreement and to consummate
the   transactions   contemplated   hereby,   STI  represents  and  warrants  to
OmniAmerica,  OmniAmericaSub  and  OmniPartners as of the date hereof as follows
(each such  representation  and warranty being  qualified in its entirety by the
disclosures set forth (a) in the Disclosure


                                     32



<PAGE>






Schedule  of STI,  which such  disclosures  shall  correspond  to the  following
sections and subsections or (b) in the SEC Documents):

            4.3.1 Corporate  Existence and Authority.  STI is a corporation duly
organized,  validly existing and in good standing under the laws of the State of
Nevada and has all requisite corporate power and authority to own its properties
and assets and to carry on its  business as it has been and is being  conducted,
except where the failure to be so organized, existing and in good standing or to
have such power and  authority  would  not,  individually  or in the  aggregate,
reasonably  be  expected  to have a  Material  Adverse  Effect  on  STI.  STI is
qualified  or licensed to do  business as a foreign  corporation  and is in good
standing in each state,  nation or other  jurisdiction  listed on the Disclosure
Schedule,  being each state, nation or other jurisdiction  wherein the character
of the properties  owned or held under lease by it or the nature of the business
transacted by it makes such qualification or licensing necessary, except for any
state,  nation or other  jurisdiction  where the failure to be so  qualified  or
licensed would not  reasonably be expected to have a Material  Adverse Effect on
STI.

            4.3.2  Capitalization  of STI. The  authorized  capital stock of STI
consists  solely of  20,000,000  shares of STI Common  Stock of which  8,055,652
shares are issued and  outstanding and 2,000,000  shares of preferred  stock, of
which none are issued and  outstanding.  No other shares of capital stock of STI
are issued and  outstanding  or  reserved  for  issuance.  All of the issued and
outstanding shares of capital stock of STI have been duly authorized and validly
issued  in  accordance  and  compliance  with all  applicable  laws,  rules  and
regulations  and are  fully  paid  and  nonassessable  and were  issued  free of
preemptive  (or similar)  rights.  There are no securities,  options,  warrants,
rights,  calls,  commitments,  plans,  contracts  or  other  agreements  of  any
character  granted or issued by STI which provide for the purchase,  issuance or
transfer  of any  shares  of the  capital  stock  of  STI,  nor  are  there  any
outstanding  securities  granted or issued by STI that are  convertible  into or
exchangeable  for or exercisable for any shares of the capital stock of STI, and
none are authorized.  All presently  exercisable voting rights in STI are vested
exclusively in the outstanding  shares of STI Common Stock,  each share of which
is entitled to one vote on every matter to come before its stockholders.  Except
for the Stockholders Agreements,  there are no stockholders  agreements,  voting
trusts or other voting  arrangements with respect to any of STI's capital stock.
There are no outstanding  obligations of STI to repurchase,  redeem or otherwise
acquire any STI Common Stock or to provide funds to or make any  investment  (in
the form of a loan, capital  contribution,  guarantee or otherwise) in any other
entity.  STI  does  not  have  any  Subsidiaries,  other  than  Novak  &  Lackey
Construction Co., Inc.,  Specialty  Management,  Inc., Microwave Tower Services,
Inc., Specialty  Constructors,  Inc.,  Specialty  Constructors  Coatings,  Inc.,
Specialty Capital Services, Inc., Specialty Combined Resources,  Inc., Specialty
Fortress, Inc., Specialty Training Centers, Inc. and the Sub.

            4.3.3 Validity and Authorization; Corporate Power and Authority.

            (a) STI has all necessary  corporate power and authority to execute,
      deliver and perform this Agreement,  the Related  Agreements and the other
      instruments called


                                     33



<PAGE>






      for by this  Agreement to which it is or is to be a party.  The execution,
      delivery and performance of this Agreement by STI and the  consummation by
      STI of the  transactions  contemplated  hereby  have been duly and validly
      authorized by all necessary  corporate  action on the part of STI (subject
      to the filing of  appropriate  merger  documents as required by the DGCL).
      This  Agreement has been duly executed and delivered by STI and,  assuming
      the valid  authorization,  execution and delivery  hereof by  OmniAmerica,
      OmniAmericaSub and OmniPartners,  constitutes the legal, valid and binding
      obligation of STI,  enforceable  against STI in accordance with its terms,
      except as such  enforcement  may be  limited  by  bankruptcy,  insolvency,
      reorganization,  moratorium,  and other similar laws affecting or relating
      to  the  enforcement  of  creditors'   rights  generally  and  by  general
      principles  of  equity  (whether  applied  in a  proceeding  at  law or in
      equity).

            (b) When the Related Agreements and the other instruments called for
      by this  Agreement to which STI is a party are  executed and  delivered at
      the Closing,  such Related  Agreements and instruments will have been duly
      authorized, executed and delivered by STI, and will be, assuming the valid
      authorization,  execution and delivery thereof by each other party thereto
      (except STI and its  Affiliates),  enforceable  against STI in  accordance
      with their terms, except as such enforcement may be limited by bankruptcy,
      insolvency,  reorganization,  moratorium, and other similar laws affecting
      or relating to the  enforcement  of  creditors'  rights  generally  and by
      general principles of equity (whether applied in a proceeding at law or in
      equity).

            4.3.4 Execution;  No Violations.  The execution and delivery of this
Agreement  by STI does  not,  and the  execution  and  delivery  of the  Related
Agreements  to  which  it is a  party,  the  consummation  of  the  transactions
contemplated  hereby and thereby and compliance  with the provisions  hereof and
thereof by STI will not:  (a)  violate,  conflict  with,  modify,  result in the
incurrence  of  any   prepayment   penalties  or  cause  any  default  under  or
acceleration,  termination  or  cancellation  of any obligation or the loss of a
benefit  under  (or  give  any  party  any  right  to  declare  any  default  or
acceleration  upon notice or passage of time or both),  in whole or in part, (i)
any provision of the articles of  incorporation or bylaws of STI, (ii) any Lien,
indenture,  lease,  loan or credit  agreement,  note,  bond,  mortgage  or other
agreement  (other  than,  with  respect to  termination,  agreements  terminable
without  material  penalty either at will or upon 90 days' or less notice by the
terminating party), obligation,  instrument,  permit,  concession,  franchise or
license  applicable  to STI or (iii)  assuming  all the  consents,  filings  and
registrations  referred to in Section  4.3.5 are  obtained  or made,  any order,
injunction,  decree,  or judgment to which STI is a party or by which STI or any
of its properties is bound; (b) result in the creation of any Lien upon or right
of first refusal with respect to any property or asset (whether real,  personal,
mixed, tangible or intangible) of STI, except as may be approved by OmniAmerica,
OmniAmericaSub  or  OmniPartners,  (c)  assuming all the  consents,  filings and
registrations  referred to in Section  4.3.5 are  obtained or made,  violate any
statute, ordinance, law, rule or regulation applicable to STI, or (d) permit any
federal or state regulatory  agency to impose any restrictions or limitations of
any  nature  on STI or any of its  activities,  except  in the  case of  clauses
(a)(ii), (b), (c) and (d), any such


                                     34



<PAGE>






violations,   conflicts,   modifications,   defaults,   accelerations,   rights,
restrictions, limitations or Liens that would not reasonably be expected to have
a Material Adverse Effect on STI or the Sub.

            4.3.5 Governmental and Other Consents.

            (a)  Except  for  filings  under  the HSR Act and the  filing of the
      certificate of merger contemplated by Section 1.3, no consent, approval or
      authorization  of, or  designation,  declaration,  registration  or filing
      with, any Governmental Entity is required on the part of STI in connection
      with the execution or delivery of this Agreement,  the Related  Agreements
      to  which  it is a party  or the  consummation  by it of the  transactions
      contemplated  hereby  and  thereby,  except  as would  not  reasonably  be
      expected to have a Material Adverse Effect on STI or the Sub.

            (b)  The  Disclosure  Schedule  lists  all  consents,  approvals  or
      authorizations  of third Persons  required in connection with STI's or the
      Sub's valid  execution,  delivery or performance of this Agreement and the
      Related  Agreements to which each is a party or the consummation of any of
      the transactions  contemplated hereby or thereby on the part of STI or the
      Sub (collectively,  the "STI Consents"),  including but not limited to the
      consents required under the Contracts,  except, in each case, as would not
      reasonably  be  expected to have a Material  Adverse  Effect on STI or the
      Sub.

            4.3.6 STI Financial Statements.

            (a) (i) The Disclosure  Schedule contains true and correct copies of
      the  consolidated  balance  sheet  for STI at  December  31,  1997 and the
      related  statements  of  profit  and  loss and cash  flows  and (ii)  when
      delivered pursuant to Section 5.5.4, similar financial statements to those
      described in clause  (a)(i) for each  additional  month ending  before the
      Closing (collectively, the "STI Financial Statements").

            (b) The STI  Financial  Statements  have been prepared in accordance
      with  GAAP and  present  fairly in all  material  respects  the  financial
      position  of STI  as of  the  dates  thereof  and  the  results  of  STI's
      operations  and cash flows for the periods then ended,  except that in the
      case of the STI Financial Statements described in clause (a)(ii) above are
      also subject to recurring year-end adjustments, if any, that are normal in
      nature and amount. STI maintains a system of accounting, including without
      limitation  a system of  internal  controls,  which  permits it to prepare
      financial  statements  that present  fairly its  financial  positions  and
      results of operations in all material respects.

            4.3.7  Absence of Certain  Liabilities.  Except (a) for  liabilities
incurred in the ordinary course of business  consistent with past practice,  (b)
for transaction  expenses not to exceed  $1,700,000  incurred in connection with
this Agreement,  (c) for  liabilities set forth on any balance sheet  (including
the notes thereto) included in the STI Financial Statements and


                                     35



<PAGE>






(d) for the STI Permitted Transactions,  STI had not incurred any liabilities or
obligations of any nature, whether or not accrued,  contingent or otherwise, and
whether due or to become due, that would be required to be reflected or reserved
against  in a  consolidated  balance  sheet  prepared  in  accordance  with GAAP
applying the same practices and procedures as were applied in the preparation of
the STI Financial Statements.

            4.3.8  Absence of  Changes.  Except as  expressly  provided  in this
Agreement or in connection with the STI Permitted  Transactions,  since December
31, 1997,  STI has conducted  its business only in the ordinary  course and in a
manner consistent with past practice and, since such date, there has not been:

            (a) Any change or aggregate of changes in the  condition  (financial
      or otherwise),  business,  assets,  or liabilities  that has had, or would
      reasonably be expected to result in, a Material Adverse Effect on STI;

            (b) Any  change in the  capitalization  of STI,  including,  without
      limitation,  the issuance by STI of any shares of stock of any class,  any
      subscriptions,  options, warrants,  convertible securities, rights, calls,
      agreements,  commitments  or rights  affecting  or  relating in any manner
      whatsoever to any equitable interests in STI;

            (c) Any  purchase,  redemption or other  acquisition  by STI, or any
      commitment,  plan or  agreement  by STI to  purchase,  redeem or otherwise
      acquire any shares of its capital stock or other equitable interests;

            (d) Any merger or consolidation or agreement to merge or consolidate
      by STI  with  another  Person,  or any  purchase  of or  investment  in or
      agreement to purchase or invest by STI in the business of another Person;

            (e)  Any  declaration,  payment  or  setting  aside  by  STI  of any
      dividends or other  distributions  of any assets of any kind whatsoever to
      its  stockholders  or other equitable  owners,  except for ordinary salary
      payments  for  services   actually   rendered   and   reasonable   expense
      reimbursements in the ordinary course of business;

            (f) Any amendment to the  certificate  or articles,  as the case may
      be, of incorporation or bylaws of STI or the Sub;

            (g) Any  increase in the  compensation  or rate of  compensation  or
      commission  payable or to become  payable by STI to any of its  directors,
      officers, salaried employees earning more than $75,000 per annum, salesmen
      or  agents,  or any  General  Increase  in the  compensation  or  rate  of
      compensation  payable or to become payable to any of its hourly  employees
      or salaried  employees earning $75,000 per annum or less, or any hiring of
      any  employee  at a  salary  in  excess  of  $75,000  per  annum,  or  any
      termination of any key employee or any employee whose  compensation was in
      excess of $75,000 per annum;


                                     36



<PAGE>







            (h) Any material change in any existing,  or adoption of or entering
      into  any new,  benefit  plan or  arrangement  (whether  written  or oral)
      affecting any of the officers, directors, employees, salesmen or agents of
      STI, including,  without limitation, any bonus,  profit-sharing,  pension,
      deferred compensation, severance or termination pay benefit, stock option,
      group life or health  insurance  or other  similar  plans,  agreements  or
      arrangements;

            (i)  Any  release,  cancellation,  modification  or  waiver  of  any
      financial  obligation,  indebtedness,  liability  or Lien in favor of STI,
      unless such obligation,  indebtedness,  liability or Lien has been paid in
      full at the time of release or such as would not,  individually  or in the
      aggregate,  reasonably  be expected to have a Material  Adverse  Effect on
      STI;

            (j) Any waivers,  compromises  or settlements by STI of any right or
      claim of STI in excess of $50,000 in the aggregate;  or any institution or
      settlement  of,  or  agreement  to  settle,  any  litigation,   action  or
      proceeding  before any  Governmental  Entity relating to STI or any of its
      properties;

            (k) Any mortgage,  pledge or other  subjection to any Lien or option
      of any property,  asset,  right or business of STI,  other than  Permitted
      Liens and those incurred in the ordinary course of business and consistent
      with past practice;

            (l) Any assumptions or guarantees (except endorsements of negotiable
      instruments in the ordinary  course of business and  consistent  with past
      practice) by STI of the obligations of any Person,  except in the ordinary
      course of business and consistent  with past practice,  but in no event in
      excess of $50,000 when all such  assumptions,  guarantees and endorsements
      are aggregated;

            (m) Any payment or  satisfaction  by STI of any material  liability,
      obligation  or  indebtedness,  other  than  those  reflected  on  the  STI
      Financial Statements and those incurred in the ordinary course of business
      and consistent with past practice;

            (n) Any loan, advance, or capital contribution to, or investment in,
      any Person in an  aggregate  amount in excess of $100,000  (excluding  any
      loan,  advance or capital  contribution  to, or investment  in, STI),  any
      commitment  to so loan,  advance,  contribute  capital or  invest,  or any
      renewal,   refunding  or  extension  of  any  existing  loan,  advance  or
      investment  made by STI to any Person,  except in the  ordinary  course of
      business and consistent with past practice;

            (o) Any actions taken or transactions  entered into by STI involving
      more than $100,000 in the aggregate,  other than in the ordinary course of
      business and consistent with past practice, or any capital expenditures or
      commitments therefor in excess of $100,000 in the aggregate, other than in
      the ordinary course of business;



                                     37



<PAGE>






            (p) Any creations,  renewals,  material changes or terminations,  or
      any notice of any proposed renewal,  material change or termination of any
      contract,  agreement,  commitment,  obligation, lease or license involving
      more than  $5,000,000 in the aggregate or extending  beyond six (6) months
      from the date of this  Agreement,  to which STI is a party or by which STI
      or its properties are bound;

            (q) Any sale, assignment, lease, abandonment or other disposition by
      STI of any real  property,  or any sale,  assignment,  transfer,  license,
      lapse, or other disposition by STI of any material trademark,  trade name,
      copyright  (or  pending   application   for  any  material   trademark  or
      copyright), or other intangible asset;

            (r) Any sale,  assignment  or transfer of any  contract,  agreement,
      lease,  or asset by STI,  except in the  ordinary  course of business  and
      consistent with past practice;

            (s) Any general labor dispute, or threat of a general labor dispute,
      or any  attempt  or  threat  of any  attempt  by a union to  organize  any
      employees  of STI who are not now  covered  under  an  existing  union  or
      collective bargaining agreement;

            (t) Any lapse of any material  insurance  policy or coverage of STI,
      except for normal renewals and/or replacements;

            (u) Any failure by STI to  replenish  inventories  and supplies in a
      normal and customary manner  consistent with prior practice;  any purchase
      commitment by STI in excess of the normal, ordinary and usual requirements
      of business or at any price in excess of the then current market price;

            (v) Any  material  damage,  destruction  or loss to the  business or
      properties of STI, whether or not covered by insurance, including, without
      limitation,  any  damage,  destruction  or  loss  as  a  result  of  fire,
      explosion,  accident,  earthquake,  lightning,  aircraft,  vehicle, smoke,
      hail, flood,  drought,  storm, strike, work stoppage,  lockout,  sabotage,
      embargo, condemnation, riot, civil disturbance, vandalism or act of God or
      public enemy the result of which is a Material Adverse Effect on STI;

            (w) Any granting of powers of attorney by STI; any material  writing
      up or  writing  down  of the  carrying  value  of any of its  assets;  any
      material  change in the  depreciation  or  amortization  policies or rates
      heretofore adopted; or

            (x) Any other material  action taken or transaction  entered into by
      STI other than in the ordinary course of business.



                                     38



<PAGE>






            4.3.9 Taxes.

            (a) STI has duly and timely filed all  required Tax Returns  related
      to STI and the Sub  heretofore  due, and all such Tax Returns are correct,
      accurate and complete in all material respects;

            (b) All  deposits  of  estimated  income and  withholding,  FICA and
      medicare Taxes required to be made by STI have been duly and timely made;

            (c) There has not been  during the past five (5) years any audits or
      examinations  of any tax  returns  filed by STI,  no audits or judicial or
      administrative  proceedings  with respect to any Taxes due from STI are in
      progress, and STI has not been notified by any tax authority that any such
      audits, examinations or proceedings are contemplated or pending;

            (d) All Taxes with  respect to STI that have  become due and payable
      on or before December 31, 1997 have been timely paid in full or adequately
      reserved against on the STI Financial Statements, and all Taxes which have
      become due and payable  subsequent  to December 31, 1997 have been paid in
      full or adequately  reserved  against in accordance with GAAP on its books
      of account and the amounts  reflected on the STI Financial  Statements and
      such books are sufficient for the payment of all unpaid Taxes with respect
      to the periods then ended and for all periods prior thereto.  There are no
      Liens on any of the  assets  of STI  that  arose  in  connection  with any
      failure (or alleged failure) to pay any Tax, except those that are not yet
      due and  payable  or are  being  contested  in good  faith by  appropriate
      proceedings;

            (e) There are no agreements, waivers or other arrangements providing
      for an extension of time with respect to the  assessment  or collection of
      any Tax  against  STI,  nor are there  any  actions,  suits,  proceedings,
      investigations or claims now pending against STI in respect of any Tax, or
      any matters under  discussion  with any federal,  state,  local or foreign
      authority,  or any claims for refund by STI for overpaid Taxes relating to
      any  Taxes,  or any  claims  for  additional  Taxes  asserted  by any such
      authority, and there is no basis for the assertion of any additional Taxes
      against STI;

            (f)  The  consummation  of the  transactions  contemplated  by  this
      Agreement  will not result in the  imposition of any  additional  Taxes on
      STI,  except  for Taxes  relating  to the  consummation  of STI  Permitted
      Transactions;

            (g) STI has  withheld  and  paid all  Taxes  required  to have  been
      withheld  and  paid  in  connection  with  amounts  paid or  owing  to any
      employee, creditor, independent contractor or other third party;



                                     39



<PAGE>






            (h) STI is not a party to any "safe harbor lease" that is subject to
      the provisions of Section  168(f)(8) of the Code as in effect prior to the
      Tax Reform Act of 1986, or to any "long-term  contract" within the meaning
      of Section 460 of the Code;

            (i)  There  are no  accounting  method  changes  in  effect or being
      requested with respect to STI that could give rise to an adjustment  under
      Section 481 of the Code for periods after the Closing Date;

            (j) STI has disclosed (in accordance with Section  6662(d)(2)(B)(ii)
      of the Code) on its federal income tax returns all positions taken therein
      that could give rise to a substantial understatement of federal income tax
      within the meaning of Section 6662(d) of the Code; and

            (k) For purposes of this  Agreement,  all  references to sections of
      the Code shall include any predecessor provisions to such sections and any
      similar provisions of state, local or foreign law.

            4.3.10 Disputes and Litigation.  (a) There is no Proceeding of which
STI  has  received  written  notice  or,  to the  Knowledge  of STI  Management,
threatened  against  or  affecting  STI  or any of  its  properties,  assets  or
businesses or to which STI is a party,  in any court or before any arbitrator of
any kind or before or by any Governmental Entity (including, without limitation,
any federal, state, local, foreign or other governmental department, commission,
board, bureau, agency or instrumentality),  the result of which, individually or
in the aggregate,  would  reasonably be expected to result in a Material Adverse
Effect on STI; (b) to the  Knowledge of STI  Management,  there is no pending or
threatened  change  in  any  Environmental  Law  or  zoning  or  building  laws,
regulations  or ordinances  the result of which would  reasonably be expected to
result in a  Material  Adverse  Effect on STI;  and (c) there is no  outstanding
order, writ, injunction, decree, judgment,  determination or award by any court,
arbitrator  or  Governmental  Entity  against  or  affecting  STI  or any of its
properties,  assets or businesses  which would  reasonably be expected to have a
Material  Adverse Effect on STI. None of the items nor aggregate of items listed
in the  Disclosure  Schedule  would,  if  adversely  determined,  reasonably  be
expected  to have a Material  Adverse  Effect on STI.  To the  Knowledge  of STI
Management,  there is no Proceeding,  formal or informal,  pending or threatened
which  would  give  rise to any  right  of  indemnification  on the  part of any
director or officer of STI.

            4.3.11  Compliance with Laws. STI presently is, and has at all times
been, in compliance in all material respects with any applicable federal, state,
local,  foreign  and other  laws,  rules  and  regulations  (including,  without
limitation,  EIA  wind-loading  and other EIA  standards as adopted in the local
building code for towers, and FAA, FCC and OSHA  regulations),  other than those
where  noncompliance would not reasonably be expected to have a Material Adverse
Effect on STI, and STI has not received any written or, to the  Knowledge of STI
Management,  oral  notice of any  claimed  violation  of any such  law,  rule or
regulation  which would reasonably be expected to have a Material Adverse Effect
on STI.


                                     40



<PAGE>






Except with respect to the matters addressed in Section 4.3.9, STI has filed all
returns,  reports and other documents and furnished all information  required or
requested   by  any   federal,   state,   local  or  foreign   governmental   or
quasi-governmental  agency  and  all  such  returns,   reports,   documents  and
information  are true and complete in all respects  except where such failure to
file or  inaccuracies  would not  reasonably be expected to result in a Material
Adverse Effect on STI. All permits,  licenses,  orders, franchises and approvals
of all federal,  state, local and foreign governmental or  quasi-governmental or
regulatory  bodies  required  of STI for the conduct of its  business  have been
obtained,  other than those where noncompliance would not reasonably be expected
to have a  Material  Adverse  Effect  on STI,  no  violations  are or have  been
recorded  in respect  of any such  permits,  licenses,  orders,  franchises  and
approvals,  and there is no Proceeding,  formal or informal,  pending or, to the
Knowledge of STI Management,  threatened,  which may revoke,  limit, or question
the validity,  sufficiency or continuance  of any such permit,  license,  order,
franchise or approval,  except in each case where the same would not  reasonably
be expected to have a Material  Adverse  Effect on STI. Such permits,  licenses,
orders,  franchises  and approvals are valid and  sufficient  for all activities
presently  carried  on by STI,  except  in each case  where  the same  would not
reasonably be expected to have a Material  Adverse  Effect on STI.  Neither STI,
nor any officer,  director,  employee,  stockholder or agent of STI has made any
offer,  payment,  promise to pay, or  authorization of the payment of any money,
offer,  gift,  promise to give,  or  authorization  of  anything of value to any
Person named or  identified  in Section 30A of the Exchange Act for any unlawful
purpose described in Section 30A of the Exchange Act.  Notwithstanding  anything
in  this  Section  4.3.11  to the  contrary,  no  representation  is made by STI
concerning its compliance with Rule 10b-5 as promulgated  under the Exchange Act
in connection with the sale of STI Common Stock pursuant to this Agreement.

            4.3.12  Insurance.  The  Disclosure  Schedule  sets forth a true and
complete list of all insurance  policies  (including the policy number, the name
of the insurer,  the amounts of coverage,  the premium rate, the cash value,  if
any, the  expiration  date and the risks and losses insured  against)  currently
maintained by STI on its properties, assets, products, businesses and personnel,
and STI shall  deliver  copies of all such  policies,  agreements,  studies  and
analyses  to  OmniAmerica  not later  than seven (7) days after the date of this
Agreement.  All of the foregoing insurance policies are in full force and effect
and are fully paid as to all premiums heretofore due. STI has not failed to give
any  notice,  if the  failure  thereof  would  reasonably  be expected to have a
Material  Adverse  Effect on STI,  or  present  any  material  claim  under such
insurance  policies  in  timely  fashion,  nor  has  STI  received  any  written
notification  of the  cancellation  of any of such  policies or that any of them
will not be renewed,  except as to such cancellations as would not, individually
or in the aggregate, reasonably be expected to have a Material Adverse Effect on
STI.

            4.3.13 Title to Properties. The properties and assets of STI consist
of (a)  all  of the  properties  and  assets  reflected  on  the  STI  Financial
Statements  as owned by it and (b) all  other  material  properties  and  assets
presently  carried  on STI's  books  as  owned by it or used in its  businesses,
except,  in each case,  properties and assets licensed or leased by STI or as to
which STI otherwise has the right to use and assets subsequently  disposed of in
the ordinary


                                     41



<PAGE>






course of business. STI has good and indefeasible title to all of its respective
properties and assets (whether real,  personal,  mixed,  tangible or intangible)
owned by it free and clear of all Liens, except Permitted Liens, if any.

            4.3.14  Real  Property  and Real  Property  Leases.  The  Disclosure
Schedule  contains a true and complete  list of (a) all real  property  owned by
STI,  (b) all real  estate  leases  to which  STI is a party,  and (c) all other
material  interests,  if any, in real  property  owned or claimed by STI. To the
Knowledge of STI Management,  STI has material  easements and rights,  including
parking  rights and easements for power lines,  water lines,  roadways and other
access,  necessary to conduct the businesses it now conducts and enjoys peaceful
and undisturbed possession of all properties occupied by it. To the Knowledge of
STI  Management,  neither the whole nor any portion of any real property  owned,
occupied  or leased to or by STI has been  adversely  rezoned  or  condemned  or
otherwise taken by any public authority and, to the Knowledge of STI Management,
no such rezoning, condemnation or other taking is threatened or contemplated. To
the Knowledge of STI Management,  none of the real properties owned, occupied or
leased  to or by  STI or the  occupancy  or  operation  thereof,  constitutes  a
nuisance or violation  of any law or any  building,  zoning or other  ordinance,
code or  regulation  or any private or public  covenant or  restriction,  and no
written notice from any Governmental Entity or other Person has been served upon
STI during the two-year period prior to the date of this Agreement  claiming any
outstanding violation of any such law, ordinance, code, regulation,  covenant or
restriction,  or  requiring  or calling  attention  to the need for any material
amount of work,  repairs,  construction,  alterations or  installations on or in
connection with any of such properties which has not been complied with,  except
as such that would not, individually or in the aggregate, reasonably be expected
to have a Material  Adverse  Effect on STI. All leases of real property to which
STI is a party are valid,  binding  and in full  force and  effect,  and,  there
exists  no  material  default  thereunder  by STI or,  to the  Knowledge  of STI
Management,  any other party thereto, nor any events which, with notice or lapse
of time, or both, would constitute a material default by STI thereunder, and all
rents  heretofore  payable  under such leases have been paid in full.  STI shall
deliver  to  OmniAmerica  not later  than  seven (7) days after the date of this
Agreement,  true,  correct and complete copies of all deeds,  title commitments,
title  policies,  and  surveys  to the real  property  listed on the  Disclosure
Schedule and true,  correct and complete copies of all real estate leases listed
on the Disclosure  Schedule,  including all  amendments,  modifications,  letter
agreements and assignments relating thereto.

            4.3.15  Intangible Personal Property.

            (a) The Disclosure Schedule contains a true and complete list of all
      material  trademarks,  service  marks,  trade  names  (including  the name
      "Speciality  Teleconstructors"  and all derivations  thereof used by STI),
      patents,  copyrights  and  applications  for the  foregoing  owned  by STI
      (collectively,  the "STI Intellectual Property"), all material licenses to
      which STI is a licensor or licensee, and all non-competition  covenants of
      STI. STI is the sole and exclusive owner of the STI Intellectual  Property
      indicated on the Disclosure Schedule to be owned by it free and


                                     42



<PAGE>






      clear of all Liens,  except  Permitted Liens, if any, and has the right to
      use the STI Intellectual Property,  having not granted or entered into any
      agreement, covenant, license or sublicense with respect thereto.

            (b) No written claims or demands have been asserted against STI with
      respect to any of the STI Intellectual  Property,  and no Proceedings have
      been  instituted,  are pending  or, to the  Knowledge  of STI  Management,
      threatened  against STI which  challenge the rights of STI with respect to
      any of such assets. To the Knowledge of STI Management, the businesses and
      operations  of STI  and  the use or  publication  of the STI  Intellectual
      Property  does not involve  infringement  or claimed  infringement  of any
      United States trademark, trade name, copyright or patent.

            (c) No director, officer or stockholder, or, to the Knowledge of STI
      Management, employee, consultant,  distributor,  representative,  advisor,
      salesman  or agent of STI owns,  directly  or  indirectly,  in whole or in
      part, any trademarks,  trade names, or copyrights, or applications for the
      foregoing,  or other  material  tangible  personal  property  which STI is
      presently  using or the use of which is necessary  for the business of STI
      as now conducted.  None of the directors,  officers or stockholders of STI
      has entered into any  agreement  regarding  know-how,  trade  secrets,  or
      prohibition or restriction of competition, or solicitation of customers or
      any other similar  restrictive  agreement or covenant,  whether written or
      oral, with any Persons other than STI.

            4.3.16  Agreements.  The  Disclosure  Schedule  contains  a true and
complete  list of all (i) oral  contracts,  leases,  and  licenses the breach of
which would result in a Material Adverse Effect on STI and (ii) all Contracts in
each case to which STI is a party or its  properties  may be bound and which (a)
involve obligations by any party thereto in excess of $250,000;  (b) require the
consent  of  any  party  thereto  to  the   consummation  of  the   transactions
contemplated by this Agreement or the Related Agreements;  (c) contain covenants
limiting  the  freedom  of STI to compete  in any line of  business  or with any
Person or in any geographical area; (d) contain any provision or option relating
to the  acquisition by STI of any business or relating to the sale by STI of any
business, other than pursuant to the STI Permitted Transactions;  (e) contain an
agreement or commitment by STI for a material  capital  expenditure,  other than
STI  Permitted  Transactions;  or (f) are  contracts or  agreements to which the
United  States  government  is  a  party;  provided,  that  notwithstanding  the
foregoing  provisions of this Section 4.3.16,  the Disclosure  Schedule need not
list,  and the term  "Contracts"  shall not  include,  agreements  for which the
obligations  of the parties  thereto have been  fulfilled.  All of the Contracts
were  entered  into by STI in the  ordinary  course of  business,  are valid and
binding and in full force and effect  against STI and, to the  Knowledge  of STI
Management,  each of the other  parties  thereto,  and there  exists no material
breach or default by STI,  or any event  which,  with notice or lapse of time or
both,  would constitute a material breach or default by STI, or to the Knowledge
of STI Management,  by any other party thereto. STI shall deliver to OmniAmerica
not  later  than  seven  (7) days  after  the date of this  Agreement,  true and
complete copies, including all amendments, modifications and


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<PAGE>






assignments  relating thereto,  of all of the aforesaid  written  agreements and
true and correct summaries of all such oral agreements.

            4.3.17  Indebtedness  and Guaranties.  The Disclosure  Schedule sets
forth  a true  and  complete  list of all  promissory  notes,  loan  agreements,
security  agreements and guarantees  relating to indebtedness for borrowed money
or money  loaned  to  others  to which  STI is a party  or  obligor.  STI has no
existing obligation to guarantee any dividend, obligation or indebtedness of any
Person  (except for the  endorsement  of negotiable  instruments in the ordinary
course of business and  consistent  with past  practice).  All of the  aforesaid
items  were  entered  into in the  ordinary  course of  business,  are valid and
binding and in full force and effect as against STI and there exists no material
breach or default  by STI,  or any event  which with  notice or lapse of time or
both,  would constitute a material breach or default by STI or, to the Knowledge
of STI Management, any other parties thereto.

            4.3.18 Debts to and from Related Parties. Except for the advancement
and  reimbursement of business  expenditures upon arms' length terms or pursuant
to valid  employment  agreements  or employee  health and benefit  plans,  there
presently  is no  indebtedness  owing to STI by, or any  contractual  agreements
between STI, on the one hand, and any stockholder, director, partner, or officer
of STI, any Family Member of their respective  families,  or to the Knowledge of
STI  Management,  any Affiliate or "associate"  (as such term is defined in Rule
405 of the Securities  Act) of any of the foregoing  individuals  (collectively,
"STI Related  Persons"),  on the other hand, and none of the STI Related Persons
owns any  material  property or rights,  tangible or  intangible  (other than an
equitable  interest),  used in STI's  business.  Except  as set forth in the STI
Financial  Statements,  STI is not  indebted to any STI Related  Person,  in any
amount whatsoever,  other than, to the Knowledge of STI Management,  for payment
of salaries,  normal  fringe  benefits,  reimbursement  of  reasonable  business
expenditures  and  compensation  for  services  actually  rendered to STI in the
ordinary course of its business.

            4.3.19 Articles of  Incorporation  and Bylaws.  Not later than three
(3) days after the date of this Agreement, STI shall deliver to OmniAmerica true
and complete copies of its articles of incorporation  and bylaws as currently in
effect.  The articles of  incorporation  and bylaws were duly adopted and are in
full force and effect,  and there are no  amendments  or  modifications  thereto
except as included in said articles of incorporation  and bylaws.  STI is not in
violation of any of the provisions of its articles of incorporation or bylaws.

            4.3.20 Books and Records.  The minute books of STI contain  accurate
records of all material  actions taken by the stockholders and directors of STI.
The books, records and accounts of STI, all of which have been made available to
OmniAmerica, have been maintained in accordance with the requirements of Section
13(b)(2) of the Exchange Act, including the maintenance of an adequate system of
internal controls.



                                     44



<PAGE>






            4.3.21  Employee Benefits.

            (a) Neither STI nor the Sub maintains,  administers,  or contributes
      to  or  has  maintained,  administered,  or  contributed  to  (or  had  an
      obligation to maintain,  administer or contribute to) or is a party to (i)
      any "employee benefit plan," as defined in Section 3(3) of ERISA (the "STI
      ERISA  Plans")  or (ii)  any  employment  or  consulting,  bonus  or other
      incentive compensation,  deferred compensation, salary continuation during
      any leave of absence, severance, stock award, stock option, stock purchase
      or fringe benefit agreements, policies or arrangements, whether written or
      oral (together with the STI ERISA Plans, the "STI Plans").

            (b) None of the STI Plans is subject  to Title IV of ERISA.  None of
      the STI Plans provides  retiree medical or life insurance  benefits to any
      Person.  None of the STI Plans  provides  for  payment of a  benefit,  the
      increase of a benefit amount, the payment of a contingent  benefit, or the
      acceleration  of the  payment  or  vesting  of a benefit  by reason of the
      execution  of  this  Agreement  or the  consummation  of the  transactions
      contemplated by this Agreement.  Neither STI nor the Sub has an obligation
      to adopt,  or is considering  the adoption of, any new STI Plan or, except
      as required by law, the amendment of any existing STI Plan. Each STI ERISA
      Plan  intended  to be  qualified  under  Section  401(a)  of the  Code has
      received  a  favorable  determination  letter  from the  Internal  Revenue
      Service that it is so qualified  and, to the Knowledge of STI  Management,
      nothing has occurred  since the date of such letter that could  reasonably
      be expected  to affect the  qualified  status of such STI ERISA Plan.  STI
      Management  is not aware of any claims  relating  to the STI Plans  (other
      than routine claims for benefits).  Each STI Plan has been operated in all
      respects  in  accordance  with  its  terms  and  the  requirements  of all
      applicable  law,  except to the extent as would not reasonably be expected
      to have a Material Adverse Effect on STI.

            (c)  Neither  STI nor any member of its  "controlled  group" has any
      withdrawal liability, under Title IV of ERISA, the terms of the applicable
      plan, any collective  bargaining agreement or any other labor agreement or
      otherwise,  with respect to any "multi-employer"  plan (within the meaning
      of Section 3(37) or 4001(a)(3) of ERISA) to which it  contributes  (or had
      any  obligation  to  contribute);  nor  has  any  event  occurred  or  any
      circumstance  exist  that  presents  a  risk  of  the  occurrence  of  any
      withdrawal liability with respect to any such multi-employer plan.

            4.3.22  Employees.

            (a) The  Disclosure  Schedule sets forth a true and complete list of
      all collective bargaining agreements to which STI is a party.

            (b) To the Knowledge of STI  Management,  STI is in full  compliance
      with all federal,  state and local laws respecting  employment,  wages and
      hours in each  case  except  to the  extent  as would  not  reasonably  be
      expected to have a Material Adverse


                                     45



<PAGE>






      Effect on STI. To the Knowledge of STI Management, STI is in compliance in
      all  material  respects  with all  applicable  federal  and state laws and
      regulations respecting occupational safety and health standards other than
      those  where  noncompliance  would not  reasonably  be  expected to have a
      Material  Adverse  Effect  on  STI,  and  STI  has  not  received  written
      complaints  from any federal or state agency or  regulatory  body alleging
      outstanding  violations of any such laws and regulations  which violations
      would, individually or in the aggregate,  reasonably be expected to have a
      Material Adverse Effect on STI.

            (c)  To  the  Knowledge  of  STI  Management,   except  pursuant  to
      applicable law, the employment of all persons and officers employed by STI
      is terminable at will, without any penalty or severance  obligation of any
      kind on the part of the  employer.  All  material  sums  due for  employee
      compensation  and benefits and all  vacation  time owing to any  employees
      have been duly and  adequately  accrued on the books of STI in  accordance
      with GAAP.  To the Knowledge of STI  Management,  all employees of STI are
      either  United  States  citizens or are  authorized  to be employed in the
      United States in accordance with all applicable laws.

            (d) STI has not  experienced  since  December 31, 1996,  any general
      labor troubles or strife, work stoppages,  slowdowns by its employees.  To
      the Knowledge of STI Management,  STI has not  experienced  since December
      31,  1996 any  union or  collective  bargaining  organization  efforts  or
      negotiations, or requests for negotiations,  for any representation or any
      labor contract  relating to any employees of STI not covered by a union or
      collective bargaining agreement as of December 31, 1996.

            (e) STI subscribes to, or is otherwise  insured under,  the worker's
      compensation  or  similar  statute  in each of the  states in which it has
      employees with respect to such employees.

            4.3.23 No Conflicts of Interest.  The Disclosure Schedule sets forth
a list of all agreements which STI has with its directors,  officers, employees,
consultants, distributors,  representatives,  advisors, salesmen and agents that
prohibit or restrain such  individuals  from competing with STI in its business.
STI does not own, directly or indirectly,  a controlling interest in, any Person
which is a customer, supplier, competitor or potential competitor of STI.

            4.3.24  Environmental Matters.

            (a) To the  Knowledge  of STI  Management,  STI has  been  and is in
      material  compliance with all applicable  Environmental Laws and possesses
      all   licenses,   permits  or  similar   authorizations   required   under
      Environmental  Laws for the  conduct of its  business  as it is  currently
      being conducted.



                                     46



<PAGE>






            (b) STI has not received any written  communication  from any Person
      that  alleges  that STI is not in  compliance  with,  or is liable  under,
      applicable Environmental Laws.

            (c) There is no Environmental  Claim pending or, to the Knowledge of
      STI  Management,  overtly  threatened  (i) against  STI,  (ii) against any
      Person whose  liability  for any  Environmental  Claim STI has retained or
      assumed either  contractually  or, to the Knowledge of STI Management,  by
      operation  of law,  or (iii)  against  any real or  personal  property  or
      operations which are now or, to the Knowledge of STI Management, have been
      previously owned, leased,  operated or managed, in whole or in part, based
      on activities conducted by STI.

            (d)  STI  is  not  subject  to  any   material   liabilities   under
      Environmental  Laws and, to the Knowledge of STI Management,  there are no
      facts,  circumstances or conditions relating to the operations of STI that
      could  reasonably  be  expected  to  result  in  STI  incurring   material
      liabilities under Environmental Laws.

            (e) There are no underground  storage tanks, no aboveground  storage
      tanks,  asbestos  or  asbestos-containing   materials  or  polychlorinated
      biphenyls  located on, under or at any property owned,  operated or leased
      by STI, except in material compliance with Environmental Laws.

            (f) STI has made available to OmniAmerica any environmental reports,
      audits or assessments on any real property  currently or formerly owned or
      leased by STI that are in the possession, custody or control of STI.

            4.3.25  Licenses.  STI has all  Licenses  necessary  to conduct  its
business in the manner and to the extent that it has been conducted,  other than
any  Licenses  the  failure of which to have would not,  individually  or in the
aggregate,  reasonably be expected to have a Material Adverse Effect on STI. The
Disclosure Schedule contains a list of every material License.  All Licenses are
in full force and effect and no Proceedings  are pending or, to the Knowledge of
STI Management,  threatened  which may result in the  revocation,  modification,
non-renewal  or  suspension  of any of the  Licenses,  the denial of any pending
application  for a License,  the  issuance  of a cease and  desist  order or the
imposition  of any  administrative  penalty or sanction,  other than those which
would not,  individually  or in the aggregate,  reasonably be expected to have a
Material  Adverse  Effect on STI.  There does not exist  under any  License  any
default or  violation,  or event  which,  with  notice or lapse of time or both,
would  constitute a default or violation  or would result in the  withdrawal  of
such License, other than defaults or violations which would not, individually or
in the  aggregate,  reasonably be expected to have a Material  Adverse Effect on
STI, nor is there, to the Knowledge of STI  Management,  any basis for assertion
of any default or violation.  STI has delivered to OmniAmerica true and complete
copies of all of the material Licenses.



                                     47



<PAGE>






            4.3.26  No  Solicitation  or  Negotiation.  STI  has  not  made  any
agreement to sell the stock,  business or substantially all of the assets of STI
to another Person, or to merge, consolidate or combine assets or business of STI
with  another  Person  (except for the STI  Permitted  Transactions)  and is not
currently  engaged in negotiations  or discussions  concerning any other sale of
the stock, or the sale,  merger or combination of any material asset or business
of STI to or with another Person (except for the STI Permitted Transactions).

            4.3.27  Fairness Opinion.  STI has received the Fairness Opinion.

            4.3.28  Investment Intent; Compliance with Securities Laws.

            (a) STI is acquiring the OmniAmerica Common Stock for investment for
      its own account,  not as a nominee or agent for any other Person,  and not
      with a view to the resale or distribution of any part thereof in violation
      of the Securities Act. STI does not have any present intention of selling,
      granting any participation  in, or otherwise  distributing the OmniAmerica
      Common  Stock  otherwise  than  pursuant  to  an  effective   registration
      statement  under the  Securities  Act or in a transaction  exempt from the
      registration  requirements  under the Securities Act and applicable  state
      securities laws. Except as set forth in the Stockholders  Agreements,  STI
      does not have any contract, undertaking, agreement or arrangement with any
      Person to sell, transfer or grant  participations to such Person or to any
      third Person, with respect to any of the OmniAmerica Common Stock.

            (b) STI acknowledges  that the sale of the OmniAmerica  Common Stock
      will not be registered  under the Securities  Act or any state  securities
      laws on the basis of a claimed  exemption by OmniPartners that the sale of
      the  OmniAmerica  Common  Stock as  provided  for  herein is  exempt  from
      registration  under the Securities Act and such state securities laws. STI
      acknowledges  that the  availability  of such  exemptions is predicated in
      part  on  STI's  representations  set  forth  in  this  Section  and  that
      OmniPartners and OmniAmerica are relying on such representations.

            (c) STI has received all the  information it considers  necessary or
      appropriate for deciding  whether to accept the OmniAmerica  Common Stock.
      STI has had an  opportunity  to ask questions and to receive  answers from
      OmniPartners, OmniAmerica and the OmniSubsidiaries regarding the terms and
      conditions of the sale of the  OmniAmerica  Common Stock and the business,
      properties,    and   financial    condition   of   OmniAmerica   and   the
      OmniSubsidiaries  and to  obtain  additional  information  (to the  extent
      OmniPartners,   OmniAmerica   or  the   OmniSubsidiaries   possessed  such
      information  or could acquire it without  unreasonable  effort or expense)
      necessary  to verify the  accuracy  of any  information  furnished  to STI
      (including the representations and warranties of OmniPartners, OmniAmerica
      and OmniAmericaSub herein) or to which STI had access.



                                     48



<PAGE>






            (d) STI  acknowledges  that it is able to bear the economic  risk of
      the investment in the OmniAmerica Common Stock, and has such knowledge and
      experience  in  financial  and  business  matters  that it is  capable  of
      evaluating  the  merits  and risks of the  investment  in the  OmniAmerica
      Common Stock.

            (e) STI is an  Accredited  Investor  as  defined  in Rule  501(a) of
      Regulation D promulgated under the Securities Act.

            (f) STI  acknowledges  that  the  OmniAmerica  Common  Stock  or any
      portion  thereof may not be sold,  transferred  or  otherwise  disposed of
      without  registration under the Securities Act or an applicable  exemption
      therefrom and that in the absence of an effective  registration  statement
      covering  the  OmniAmerica  Common Stock or an  available  exemption  from
      registration  under the Securities Act, the OmniAmerica  Common Stock must
      be held indefinitely. STI further acknowledges that the OmniAmerica Common
      Stock  may  not be  sold  pursuant  to  Rule  144  promulgated  under  the
      Securities Act unless all of the conditions of that rule are met.

            (g) STI acknowledges  that each certificate  representing any of the
      OmniAmerica  Common  Stock will be  endorsed  with a legend  substantially
      similar to the following:

                  THE  SECURITIES  REPRESENTED  HEREBY HAVE NOT BEEN  REGISTERED
                  UNDER THE  SECURITIES  ACT OF 1933,  AS AMENDED,  OR ANY STATE
                  SECURITIES LAWS, AND MAY NOT BE SOLD OR TRANSFERRED  UNLESS SO
                  REGISTERED  OR UNLESS THE COMPANY  HAS  RECEIVED AN OPINION OF
                  COUNSEL  OR OTHER  EVIDENCE,  REASONABLY  SATISFACTORY  TO THE
                  COMPANY  AND  ITS  COUNSEL,  THAT  SUCH  REGISTRATION  IS  NOT
                  REQUIRED.

            4.3.29  Disclosure.  No  representation  or  warranty  by STI or Sub
contained  in  this  Agreement,  and no  statement  contained  in  any  document
(including  without  limitation  the  STI  Financial  Statements,   the  closing
documents  delivered  pursuant to Article VII and the  Disclosure  Schedules  or
Subsequent  Disclosure  Schedules of STI  hereto),  list,  certificate  or other
instrument  furnished or to be furnished  prior to the  Effective  Time by or on
behalf  of  STI  or  any  Affiliate   thereof  to  OmniAmerica  or  any  of  its
representatives  in  connection  with  the  transactions   contemplated  hereby,
contained  or will  contain when  furnished  any untrue  statement of a material
fact,  or omitted or will omit when  furnished  to state any  material  fact (i)
necessary,  in light of the circumstances under which it was or will be made, in
order to make the statements  herein or therein not misleading or (ii) necessary
in order fully and fairly to provide the information  required to be provided in
any such document, list, certificate or other instrument, which untrue statement
or omission of a material fact in each case results in a Material Adverse Effect
on STI. STI has not failed to disclose to


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<PAGE>






OmniAmerica  any fact which would  reasonably  be  determined to have a Material
Adverse Effect on STI.

      4.4  Representations  and  Warranties  of the Sub. To induce  OmniAmerica,
OmniAmericaSub  and  OmniPartners to enter into this Agreement and to consummate
the  transactions  contemplated  hereby,  the Sub  represents  and  warrants  to
OmniAmerica,  OmniAmericaSub  and  OmniPartners as of the date hereof as follows
(each such  representation  and warranty being  qualified in its entirety by the
disclosures set forth in the Disclosure  Schedule,  which such disclosures shall
correspond to the following sections and subsections):

            4.4.1 Corporate Existence and Authority. The Sub was incorporated in
Delaware on February  13, 1998 for the sole purpose of  consummating  the Merger
and has not conducted any business since its  incorporation,  has no liabilities
(whether fixed or contingent)  whatsoever (other than its obligations hereunder)
and neither has nor has had employees.  The Sub is a corporation duly organized,
validly  existing and in good standing  under the laws of the State of Delaware.
The Sub has all requisite  corporate  power and authority to own its  properties
and assets and to carry on its business as it has been and is being conducted.

            4.4.2 Capitalization of the Sub. The authorized capital stock of the
Sub  consists  solely of 2,000  shares of the Sub Common  Stock,  of which 1,000
shares are issued and  outstanding,  and 1,000  shares of preferred  stock,  par
value $1.00 per share, of which none are issued and outstanding. No other shares
of capital stock of the Sub are issued and outstanding or reserved for issuance.
All of the issued and  outstanding  shares of capital stock of the Sub have been
duly  authorized  and  validly  issued in  accordance  and  compliance  with all
applicable laws, rules and regulations and are fully paid and  nonassessable and
were issued free of preemptive  (or similar)  rights.  There are no  securities,
options,  warrants,  rights,  calls,  commitments,  plans,  contracts  or  other
agreements of any  character  granted or issued by the Sub which provide for the
purchase,  issuance or  transfer of any shares of the capital  stock of the Sub,
nor are there any outstanding  securities  granted or issued by the Sub that are
convertible  into or  exchangeable  for or  exercisable  for any  shares  of the
capital stock of the Sub, and none are  authorized.  All  presently  exercisable
voting rights in the Sub are vested exclusively in the outstanding shares of the
Sub Common Stock, each share of which is entitled to one vote on every matter to
come before sole stockholder, STI. There are no stockholders' agreements, voting
trusts or other voting  arrangements  with  respect to any of the Sub's  capital
stock. There are no outstanding obligations of the Sub to repurchase,  redeem or
otherwise acquire any of the Sub Common Stock or to provide funds to or make any
investment (in the form of a loan, capital contribution, guarantee or otherwise)
in any other entity. The Sub does not have any direct Subsidiaries.

            4.4.3 Validity and Authorization; Corporate Power and Authority.

            (a) The Sub has full  corporate  power  and  authority  to  execute,
      deliver and perform this Agreement,  the Related  Agreements and the other
      instruments  called  for by this  Agreement  to  which it is or is to be a
      party. The execution, delivery and


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<PAGE>






      performance of this Agreement by the Sub and the  consummation  by the Sub
      of the  transactions  contemplated  hereby  have  been  duly  and  validly
      authorized  by all  necessary  corporate  action  on the  part  of the Sub
      (subject to the filing of appropriate  merger documents as required by the
      DGCL). This Agreement has been duly executed and delivered by the Sub and,
      assuming  the  valid  authorization,  execution  and  delivery  hereof  by
      OmniPartners, OmniAmerica and OmniAmericaSub, constitutes the legal, valid
      and  binding  obligation  of  the  Sub,  enforceable  against  the  Sub in
      accordance  with its terms,  except as such  enforcement may be limited by
      bankruptcy, insolvency, reorganization, moratorium, and other similar laws
      affecting or relating to enforcement of creditors' rights generally and by
      general principles of equity (whether applied in a proceeding at law or in
      equity).

            (b) When the Related Agreements and the other instruments called for
      by this  Agreement to which the Sub is a party are executed and  delivered
      at the Closing,  such Related  Agreements and  instruments  will have been
      duly authorized, executed and delivered by the Sub, and assuming the valid
      authorization,  execution and delivery thereof by each other party thereto
      (other than STI and its Affiliates),  will be enforceable  against the Sub
      in accordance with their terms,  except as such enforcement may be limited
      by bankruptcy, insolvency,  reorganization,  moratorium, and other similar
      laws  affecting  or  relating  to the  enforcement  of  creditors'  rights
      generally  and by  general  principles  of equity  (whether  applied  in a
      proceeding at law or in equity).

            4.4.4 Execution;  No Violations.  The execution and delivery of this
Agreement by the Sub do not, and the consummation by the Sub of the transactions
contemplated  hereby, and compliance by the Sub with the provisions hereof, will
not:  (a)  violate,  conflict  with,  modify,  result in the  incurrence  of any
prepayment penalties or cause any default under or acceleration,  termination or
cancellation of any obligation or the loss of a benefit under (or give any party
any right to declare any default or acceleration  upon notice or passage of time
or  both),  in  whole  or in  part,  (i) any  provision  of the  certificate  of
incorporation or bylaws of the Sub, (ii) assuming all the consents,  filings and
registrations  referred to in Section  4.4.5 are  obtained  or made,  any order,
injunction,  decree, or judgment to which the Sub is a party or by which the Sub
or any of its  properties is bound;  (b) result in the creation of any Lien upon
or right of first refusal with respect to any property or asset  (whether  real,
personal,  mixed,  tangible or intangible) of the Sub, except as may be approved
by  OmniAmerica,  or (c) assuming all the  consents,  filings and  registrations
referred  to in  Section  4.4.5  are  obtained  or made,  violate  any  statute,
ordinance,  law, rule or regulation applicable to the Sub, except in the case of
clauses (b) and (c), any such violations,  conflicts,  modifications,  defaults,
accelerations,  rights,  restrictions,  limitations  or  Liens  that  would  not
reasonably be expected to have a Material Adverse Effect on the Sub.

            4.4.5 Governmental and Other Consents.  Except for filings under the
HSR Act and the filing of the certificate of merger contemplated by Section 1.3,
no  consent,   approval  or  authorization  of,  or  designation,   declaration,
registration or filing with, any Governmental  Entity is required on the part of
the Sub in connection with the execution or delivery of this


                                     51



<PAGE>






Agreement or the  consummation by it of the  transactions  contemplated  hereby,
except as would not reasonably be expected to have a Material  Adverse Effect on
the Sub.

      4.5 Disclosure Schedules. Disclosure of any fact or item in any Disclosure
Schedule or  Subsequent  Disclosure  Schedule  referred by a particular  Section
shall,  should the  existence of the fact or item or its contents be relevant to
any  other  Section,  be deemed  to be  disclosed  with  respect  to such  other
Section(s) whether or not an explicit cross reference appears and whether or not
the Section(s) make reference to any Schedule.  The disclosure of any particular
fact or item in any Disclosure Schedule or Subsequent  Disclosure Schedule shall
not be deemed any  admission  as to whether  the fact or item is  "material"  or
would constitute a Material Adverse Effect.

                                   ARTICLE V
                                   COVENANTS

      5.1  Mutual  Covenants.  To induce  the other  parties  to enter into this
Agreement and to consummate the transactions  contemplated  hereby,  and without
limiting any covenant,  agreement,  representation or warranty made elsewhere in
this  Agreement,  the parties agree that between the date of this  Agreement and
the earlier of the Effective Time or the termination of this Agreement  pursuant
to Article  VIII,  except as may be consented to in writing by the other parties
or  as  otherwise  contemplated  by  this  Agreement  (including  the  Permitted
Transactions), as follows:

            5.1.1 Access and Information.  Each party (other than  OmniPartners)
will,  except to the extent limited as advised by antitrust  counsel,  and if so
limited,  only to the extent of such advice,  (a) provide the other  parties and
their  Representatives,  during normal  business  hours, or otherwise if another
party reasonably requests,  and upon reasonable advance notice, access to all of
the properties, assets, agreements,  commitments,  books, records, accounts, Tax
Returns,  correspondence  and  documents  of such party and permit  them to make
copies thereof; (b) furnish the other parties and their Representatives with all
information  concerning the business,  properties and affairs of such party; (c)
use commercially  reasonable  efforts to cause its accountants to make available
to the  other  parties  and  their  Representatives  all  financial  information
relating to such party,  including all working  papers  pertaining to audits and
reviews made by its  auditors;  (d) furnish the other  parties true and complete
copies of all  financial  and  operating  statements  of such party;  (e) permit
access to customers  and  suppliers  for  consultation  or  verification  of any
information;  and (f)  cause  its  employees,  and use  commercially  reasonable
efforts to cause its  accountants,  to cooperate  fully with any audit,  review,
investigation  or examination  made by the other party and its  Representatives,
including, without limitation, with respect to:

                  (i)   The books and records of such party;

                  (ii) The reports of state and federal regulatory examinations;



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<PAGE>






                  (iii) Leases, contracts and commitments between such party, on
            the one hand, and any other Person, on the other hand;

                  (iv) Physical  examination of any real properties owned by, or
            leased to or by such party; and

                  (v) Physical examination of any furniture, fixtures, equipment
            or other personal property owned by or leased to or by such party.

Notwithstanding the foregoing,  OmniPartners shall, except to the extent limited
as advised by antitrust counsel,  and if so limited,  only to the extent of such
advice,  provide STI and its Representatives  with or access to all information,
books, records,  contracts and agreements related to the business and affairs of
OmniAmericaSub.  OmniAmericaSub shall deliver to STI true and complete copies of
all of its material Licenses within seven days of the date hereof.

            5.1.2  Notices and  Approvals.  Each party  agrees:  (a) to give all
notices  to third  parties  which  may be  necessary  in  connection  with  this
Agreement, the Related Agreements to which it is a party and the consummation of
the  transactions  contemplated  hereby  and  thereby;  (b) to use such  party's
commercially  reasonable  efforts  to obtain  all  federal,  state  and  foreign
governmental and quasi-governmental approvals, consents, permits, authorizations
and orders necessary in connection with this Agreement,  the Related  Agreements
to which it is a party and the  consummation  of the  transactions  contemplated
hereby and thereby; and (c) to use such party's commercially  reasonable efforts
to obtain all  consents and  authorizations  of any other  Persons  necessary in
connection  with this Agreement,  the Related  Agreements to which it is a party
and the consummation of the transactions contemplated hereby and thereby.

            5.1.3 No  Solicitation  or  Negotiation.  Other  than the  Permitted
Transactions  or as agreed to in  writing  by the  parties  hereto,  none of the
parties hereto nor their respective officers, directors, principal stockholders,
employees, Representatives or advisors will, formally or informally, directly or
indirectly,  (i) initiate, solicit or encourage any inquiry or the submission of
any proposal by any Person that  constitutes or is reasonably  likely to lead to
an Acquisition  Proposal (as defined  below),  or (ii) engage in negotiations or
discussions with, or furnish any information or data to, any Person relating to,
or take any other  action  to  facilitate  any  inquiries  or the  making of any
proposal  that  constitutes,  or may  reasonably  be  expected  to lead  to,  an
Acquisition Proposal;  provided,  however, that STI may negotiate with a Person,
other than  Budagher,  Carpenter or an Affiliate of either of them (a "Potential
Acquiror"),  if (i) the Potential  Acquiror has, in circumstances  not involving
any  prior  breach  by STI of the  foregoing  provisions,  made  an  Acquisition
Proposal,  (ii) STI's Board of Directors  believes (based in part upon advice of
its  Representatives,  and  after  having an  opportunity  to  discuss  any such
Acquisition  Proposal with the Potential  Acquiror,  which contacts shall not be
deemed a violation of this Section 5.1.3) that such  Potential  Acquiror has the
financial  wherewithal  to  consummate  the  Acquisition  contemplated  by  such
Acquisition  Proposal and the  consummation of the  Acquisition  contemplated by
such  Acquisition  Proposal would be more favorable to STI's  stockholders  than
would the Merger from a financial point


                                     53



<PAGE>






of view (a  "Superior  Proposal")  and (iii) based upon the advice of counsel to
STI's Board of Directors (notice of which advice shall have been communicated to
OmniAmerica),  STI's Board of Directors determines in good faith that there is a
significant risk that the failure to negotiate with the Potential Acquiror could
constitute a breach of its fiduciary duty to STI's stockholders. Each party will
give prompt notice,  both oral and written,  to the other parties if such party,
any  of  its  Subsidiaries  or  any of  their  respective  officers,  directors,
principal  stockholders,  employees,  Representatives  or advisors  receives any
communication  from a Person not a party to this  Agreement  that  proposes  any
discussion,  negotiation or agreement  prohibited  under this Section 5.1.3.  In
addition,  STI will give  prompt  notice,  both oral and  written,  to the other
parties of the identity of the Person making any communication  from a Potential
Acquiror and whether STI has elected to negotiate  with a Potential  Acquiror in
accordance  with this  Section  5.1.3.  STI shall  use  commercially  reasonable
efforts to keep OmniAmerica fully informed of the status of any such Acquisition
Proposal  or  negotiation  with  respect  thereto.  STI  may  not  enter  into a
definitive  agreement for an Acquisition Proposal with a Potential Acquiror with
which STI is permitted to negotiate pursuant to this Section 5.1.3 unless (i) at
least 10 Business Days prior to STI's execution thereof STI shall have furnished
OmniAmerica with a description of all of the material terms thereof and (ii) STI
shall terminate this Agreement in accordance with Section 8.1.2 hereof.

      For purposes of this Agreement,  (i) "Acquisition Proposal" shall mean any
bona fide  proposal,  whether in writing or otherwise,  made by a third party to
effect an  Acquisition  and (ii)  "Acquisition"  shall mean the  acquisition  of
Beneficial  Ownership  of all or a  material  portion  of the  assets of, or any
material  interest  in,  STI  (including  its   Subsidiaries),   OmniAmerica  or
OmniAmericaSub,  as  applicable,  pursuant to a merger,  consolidation  or other
business  combination,  sale of shares of capital stock of STI,  OmniAmerica  or
OmniAmericaSub,  or any of their respective Subsidiaries, sale of assets, tender
offer,   exchange  offer,   joint  venture,   sale/leaseback  or  other  similar
transaction.

            5.1.4  Proceedings.  Each  party  (other  than  OmniPartners)  shall
promptly notify the other party of any material  Proceedings that are threatened
in writing  or  commenced  against  such  party or its  employees,  consultants,
officers or directors  which may relate to, or affect,  the business,  assets or
liabilities of such party.  Such party shall not knowingly fail to comply in any
material respect with any laws, regulations, ordinances, orders, injunctions and
decrees  applicable  to it, its  properties,  and the  conduct of its  business.
OmniPartners  shall  promptly  notify STI of any material  Proceedings  that are
threatened in writing or commenced against  OmniPartners which may relate to, or
affect, the business, assets or liabilities of OmniAmerica or OmniAmericaSub.

            5.1.5  Reports and  Returns.  Each party  (other than  OmniPartners)
shall duly and timely file all  reports  and  returns  required to be filed with
federal,  state,  local and other  authorities  prior to the Closing,  including
without limitation any Tax Returns,  which reports and returns shall be prepared
in accordance with all regulatory  requirements in all material  respects.  Each
party (other than OmniPartners)  shall promptly pay all material Taxes and other
quasi-governmental  charges levied or assessed upon such party or its properties
prior to


                                     54



<PAGE>






the date on which penalties attach thereto (unless any such Taxes or charges are
being  contested  in good faith and for which  adequate  reserves  appear in the
OmniAmerica Financial Statements with respect to OmniAmerica, OmniAmericaSub and
the Acquired Businesses and in the STI Financial  Statements with respect to STI
and the Sub) and all lawful claims which, if unpaid when due and payable,  might
become a Lien upon property of such party,  except Permitted  Liens.  Each party
(other than OmniPartners) shall timely make all deposits required of such party,
with respect to any estimated  income and  withholding,  FICA and medicare Taxes
(unless any such Taxes or  deposits  are being  contested  in good faith and for
which adequate  reserves  appear in the  OmniAmerica  Financial  Statements with
respect to OmniAmerica,  OmniAmericaSub  and the Acquired  Businesses and in the
STI Financial Statements with respect to STI and the Sub).

            5.1.6  Assist in  Obtaining  Licenses,  Etc.  Each party (other than
OmniPartners)  shall reasonably assist the other party in obtaining all permits,
licenses  and   authorizations   necessary  for  the   continued   operation  of
OmniAmericaSub at and after the Effective Time;  provided that OmniAmerica shall
not be  required to pay  additional  sums to secure  such  permits,  licenses or
authorizations.

            5.1.7 Consents.  OmniAmericaSub  shall use  commercially  reasonable
efforts to obtain the OmniAmerica Consents;  OmniPartners shall use commercially
reasonable  efforts  to  obtain  the  OmniPartners  Consents  and STI  shall use
commercially reasonable efforts to obtain the STI Consents.

            5.1.8 Insurance.  OmniAmericaSub and STI shall continue in force all
existing insurance now carried by such party except to the extent such insurance
is replaced with a substantially equivalent policy.

            5.1.9 Preservation of Business. Each party (other than OmniPartners)
shall use its  commercially  reasonable  efforts to preserve and keep intact its
business,  to retain its  officers,  and to  preserve  the  goodwill  of its key
employees,  and material customers,  suppliers and other Persons having business
relations with such party.

            5.1.10  Tax  Treatment.  The  Merger is  intended  to  qualify  as a
reorganization   within  the  meaning  of  Section   368(a)(1)(A)   and  Section
368(a)(2)(E)  of the Code. Each party shall file (and shall cause its Affiliates
to file) all Tax  Returns in a manner  which is  consistent  with the  foregoing
intended  treatment.  Each party shall not (and shall not permit its  Affiliates
to) take any action which is inconsistent with or contrary to or which adversely
affects  the  foregoing   intended   treatment,   unless  a  court  with  proper
jurisdiction  issues  a final,  non-appealable  order  that  such  treatment  is
incorrect.

            5.1.11 Updating of Disclosure Schedules.  If, subsequent to the date
of this  Agreement  and prior to the Closing  Date, an event occurs that renders
untrue any  representation  or warranty  of a party made  herein (a  "Subsequent
Event"),  such party shall  promptly  deliver to the other parties an amended or
supplemental disclosure schedule (a


                                     55



<PAGE>






"Subsequent  Disclosure  Schedule")  which  will  contain a  description  of the
Subsequent  Event.  The existence of a Subsequent  Event which is disclosed on a
Subsequent  Disclosure  Schedule  shall not constitute a Breach by such party of
any of its  representations or warranties  hereunder or be taken into account in
determining whether the conditions precedent set forth in Section 6.1.1 or 6.2.1
has been satisfied or form a basis for any claim by the other parties hereunder;
provided,  however, that this Section is not intended to permit a party to alter
or amend its  representations  and  warranties  as made herein as of the date of
this Agreement, including any Disclosure Schedule, and any Subsequent Disclosure
Schedule  provided  by any party  pursuant  to this  Section  shall not cure the
inaccuracy  thereof as of the date of this  Agreement for any purpose under this
Agreement.

            5.1.12  Other  Covenants.  Each  party  shall  use its  commercially
reasonable  efforts to satisfy the conditions to the  obligations of the parties
hereunder  within such party's  reasonable  control,  and to consummate and make
effective  as promptly  as  practicable  the  transactions  provided  for herein
including but not limited to the following:

            (a) Defending the Agreement.  Defending Proceedings challenging this
      Agreement or any Related Agreement or the consummation of the transactions
      provided for in this Agreement or any Related Agreement;

            (b) Lifting  Injunctions.  Using commercially  reasonable efforts to
      lift or rescind any injunction, restraining order or other order adversely
      affecting  the  ability of the  parties  to  consummate  the  transactions
      provided for in this Agreement or any Related Agreement; and

            (c) Other  Actions.  Taking such other  reasonable  actions that are
      necessary, appropriate or advisable.

      5.2 OmniAmerica and OmniAmericaSub  Covenants. To induce the other parties
to enter into this  Agreement and to consummate  the  transactions  contemplated
hereby, and without limiting any covenant, agreement, representation or warranty
made  elsewhere in this  Agreement,  between the date of this  Agreement and the
earlier of the  Effective  Time or  termination  of this  Agreement  pursuant to
Article VIII,  OmniAmerica and OmniAmericaSub  agree, except as may be consented
to by the other  parties or as  otherwise  contemplated  by this  Agreement,  as
follows:

            5.2.1  Financial  Statements.  OmniAmerica and  OmniAmericaSub  will
exert all  commercially  reasonable  efforts to obtain from E&Y, KPMG,  WC&G and
DS&S and deliver to STI (a) reports  from E&Y on such  audited  balance  sheets,
statements of operations, stockholders' equity and cash flows of the business of
OmniAmericaSub (on a consolidated  basis) and such audited statements of revenue
and direct expenses for the HSW Assets (collectively, the "E&Y Audited Financial
Statements"),  (b) reports from KPMG on such audited balance sheets,  statements
of income,  statements of partners' capital, and statements of cash flows of the
business of OmniTower Ltd. (the "KPMG Audited Financial Statements"),


                                     56



<PAGE>






(c) reports  from WC&G on such audited  balance  sheets,  statements  of income,
statements of shareholders'  equity and statements of cash flows of the business
of Miller Towers (the "WC&G  Audited  Financial  Statements"),  (d) reports from
DS&S on such  audited  balance  sheets,  statements  of  income,  statements  of
stockholders'  equity and statements of cash flows of the business of KISCO (the
"DS&S Audited  Financial  Statements"),  in each case for each of the last three
fiscal years and any required interim period as STI may be required to file with
the SEC in connection  with STI's filings with the SEC under the  Securities Act
and the Exchange Act (the "SEC Filings"),  including specifically,  under Item 7
of Form 8-K and (e) such consents of E&Y, KPMG,  WC&G and DS&S to the use of the
opinions of E&Y, KPMG, WC&G and DS&S  (collectively,  the "Auditors'  Consents")
accompanying such respective audited financial statements in the SEC Filings. In
addition,  OmniAmericaSub  shall deliver to STI not later than the 45th Business
Day after the end of each month,  financial  statements of the kind described in
Section 4.1.6 for the month ended January 1998 and each subsequent  month before
the Closing.

            5.2.2 Restriction on Transfers. OmniAmerica shall not enter into any
agreement to, sell, transfer, pledge,  hypothecate,  or dispose of any shares of
OmniAmericaSub Common Stock, except pursuant to this Agreement.

            5.2.3  Termination of Certain Affiliate  Contracts.  OmniAmerica and
OmniAmericaSub  will terminate all contracts and agreements,  whether written or
oral,  between  OmniAmerica  or  OmniAmericaSub,  on the  one  hand,  and  HMTF,
OmniPartners or their Affiliates (not including  OmniAmerica or OmniAmericaSub),
on the other hand,  other than the  contracts and  agreements  listed on Exhibit
5.2.3  and  contracts  entered  into  in the  ordinary  course  of  business  on
arms'-length terms (collectively, the "OmniAmerica Affiliate Contracts").

            5.2.4 Zoning Compliance Letters. OmniAmerica and OmniAmericaSub will
exert commercially  reasonable efforts to cause the local Governmental Entity in
charge of zoning to issue a zoning  compliance  letter  for each  parcel of real
property  owned  by  OmniAmericaSub  on  which is  located  a  Tower,  in a form
reasonably acceptable to STI.

            5.2.5 Conduct of Business.  Unless otherwise expressly  contemplated
hereby (including the OmniAmerica Permitted Transactions) or approved in writing
by STI,  OmniAmerica  and the  OmniAmericaSub  agree that their  businesses  and
operations  (including the  businesses  and operations of the  OmniSubsidiaries)
shall be conducted  only in, and they shall not take any material  action except
in,  the  ordinary  course  of  business  and  consistent  with  past  practice,
including,  without limitation, in material compliance with all applicable laws,
rules and  regulations,  including the rules and regulations of the FAA and FCC.
Without limitation,  OmniAmerica and OmniSubsidiaries  shall not take, nor enter
into any  agreements to take,  any of the following  actions except in each such
case in connection  with this  Agreement  (including the  OmniAmerica  Permitted
Transactions)  or  consented  to in  writing by STI  (which  consent  may not be
unreasonably withheld) or, in the case of actions described in clauses (a) - (c)
of this Section 5.2.5, in the ordinary  course of business  consistent with past
practice:


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<PAGE>






(a)  dispose of, or acquire,  or agree to dispose of or  acquire,  any  material
assets,  other  than the  OmniAmerica  Permitted  Transactions,  (b)  incur  any
indebtedness  for  borrowed  money,  except for  aggregate  borrowings  of up to
$750,000,  (c) pay any discretionary bonuses (other than bonuses already accrued
on the date hereof) to, or alter the  compensation  or benefit of, any director,
officer  or  employee,  (d) enter into any  transaction  or  agreement  with any
Affiliate or associate (as defined in Rule 405 under the  Securities  Act),  (e)
institute  any  material  reduction  in force,  (f) close  any  office,  base or
station,  (g) take any action not in the ordinary  course of business  that will
knowingly cause any of such party's  representations  or warranties to be untrue
or incorrect  in any  material  respect,  (h) omit any  commercially  reasonable
action  that such party would take in the  ordinary  course of  business,  which
omission will knowingly cause any of such party's  representations or warranties
to be untrue or incorrect in any material respect, (i) declare, set aside or pay
any dividends on, or make any distribution or payment with respect to, or redeem
or repurchase,  any shares of capital stock, options, warrants, debt securities,
or any securities convertible into or exchangeable for or exercisable for shares
of capital stock of any of such party or take any other actions which would have
a similar effect, (j) amend any of their certificates of incorporation or bylaws
or (k) issue any shares of capital stock or any securities,  options,  warrants,
rights,  calls,  commitments,  plans,  contracts  or  other  agreements  of  any
character whatsoever which provide for the purchase, issuance or transfer of any
shares  of  capital  stock,  or any  securities  that  are  convertible  into or
exchangeable  for any shares of capital  stock or increase or  decrease,  change
into or exchange  any such  shares for a  different  number or kind of shares or
securities through a reorganization,  recapitalization,  reclassification, stock
dividend,  stock  split,  reverse  stock  split,  or  other  similar  change  in
capitalization.

            5.2.6 Preservation of Vote. OmniAmerica and OmniAmericaSub shall not
withdraw,  rescind, change or modify their vote in favor of this Agreement,  the
Merger and other transactions contemplated by this Agreement.

            5.2.7  Limitation on Short-Term  Liabilities.  OmniAmericaSub  shall
cause the aggregate  accounts  payable and other short-term  liabilities  (other
than  liabilities  for unearned  revenues)  that would be set forth on a balance
sheet of  OmniAmerica  dated the Closing  Date not to exceed  $500,000 as of the
Closing Date.

      5.3 OmniPartners Covenants. To induce the other parties to enter into this
Agreement and to consummate the transactions  contemplated  hereby,  and without
limiting any covenant,  agreement,  representation or warranty made elsewhere in
this  Agreement,  between  the date of this  Agreement  and the  earlier  of the
Effective  Time or  termination  of this  Agreement  pursuant  to Article  VIII,
OmniPartners shall (a) not enter into any agreement to sell,  transfer,  pledge,
hypothecate,   or  dispose  of  any  shares  of  OmniAmerica   Common  Stock  or
OmniAmericaSub  Common  Stock,  except  pursuant  to  this  Agreement,  (b)  not
withdraw,  rescind,  change or modify its vote in favor of this  Agreement,  the
Merger and other transactions  contemplated by this Agreement, (c) not take, nor
enter into any  agreements  to take,  any action not in the  ordinary  course of
business  that will  knowingly  cause any of  OmniPartners'  representations  or
warranties to be untrue or incorrect in any material respect,


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<PAGE>






(d) not omit to take any commercially  reasonable action that OmniPartners would
take in the ordinary course of business, which omission will knowingly cause any
of OmniPartners'  representations or warranties to be untrue or incorrect in any
material  respect  or (e) cause the HSW Merger to occur  prior to the  Effective
Time.

      5.4 Omni/HSW Acquisition  Covenants.  To induce the other parties to enter
into this Agreement and to consummate the transactions  contemplated hereby, and
without  limiting  any  covenant,  agreement,  representation  or warranty  made
elsewhere in this Agreement,  between the date of this Agreement and the earlier
of the  Effective  Time of the  HSW  Merger  or  termination  of this  Agreement
pursuant  to  Article  VIII,  Omni/HSW  Acquisition  agrees,  except  as  may be
consented  to  by  the  other  parties  or as  otherwise  contemplated  by  this
Agreement, as follows:

            5.4.1 Preservation of Vote. Omni/HSW Acquisition shall not withdraw,
rescind,  change  or  modify  its  vote in  favor of this  Agreement  and  other
transactions contemplated by this Agreement.

            5.4.2 Conduct of Business.  Unless otherwise expressly  contemplated
hereby (including the OmniAmerica Permitted Transactions) or approved in writing
by STI, Omni/HSW  Acquisition agrees that its businesses and operations shall be
conducted  only in,  and it shall not take any  material  action  except in, the
ordinary  course of business of the HSW Assets and consistent with past practice
of the HSW Assets,  including,  without limitation,  in material compliance with
all applicable laws, rules and regulations,  including the rules and regulations
of the FAA and FCC. Without limitation, Omni/HSW Acquisition shall not take, nor
enter into any agreements to take,  any of the following  actions except in each
such case in  connection  with this  Agreement or consented to in writing by STI
(which  consent  may not be  unreasonably  withheld)  or, in the case of actions
described in clauses (a) - (c) of this Section 5.4.2,  in the ordinary course of
business consistent with past practice:  (a) dispose of, or acquire, or agree to
dispose of or acquire,  any  material  assets,  (b) incur any  indebtedness  for
borrowed  money,  except  for  borrowings  of  up  to  $500,000,   (c)  pay  any
discretionary  bonuses (other than bonuses  already  accrued on the date hereof)
to, or alter the compensation or benefit of, any director,  officer or employee,
(d) enter into any  transaction or agreement with any Affiliate or associate (as
defined  in Rule 405 under the  Securities  Act),  (e)  institute  any  material
reduction in force, (f) close any office,  base or station,  (g) take any action
not in the  ordinary  course of business  of the HSW Assets that will  knowingly
cause  any of the  representations  or  warranties  of  OmniPartners  concerning
Omni/HSW Acquisition to be untrue or incorrect in any material respect, (h) omit
any commercially  reasonable action that it would take in the ordinary course of
business of the HSW  Assets,  which  omission  will  knowingly  cause any of the
representations or warranties of OmniPartners concerning Omni/HSW Acquisition to
be untrue or incorrect in any material  respect,  (i) declare,  set aside or pay
any dividends on, or make any distribution or payment with respect to, or redeem
or repurchase, any shares of capital stock, options, warrants, or any securities
convertible  into or exchangeable for or exercisable for shares of capital stock
of any such party,  (j) amend its certificate of  incorporation or bylaws or (k)
issue any shares of capital stock of such party or


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<PAGE>






any securities,  options, warrants, rights, calls, commitments, plans, contracts
or other agreements of any character  whatsoever which provide for the purchase,
issuance or transfer of any shares of capital stock,  or any securities that are
convertible  into or  exchangeable  for any shares of capital  stock of Omni/HSW
Acquisition,  or increase or  decrease,  change into or exchange any such shares
for a different number or kind of shares or securities through a reorganization,
recapitalization,  reclassification,  stock dividend, stock split, reverse stock
split, or other similar change in capitalization.

      5.5 STI  Covenants.  To  induce  the  other  parties  to enter  into  this
Agreement and to consummate the transactions  contemplated  hereby,  and without
limiting any covenant,  agreement,  representation or warranty made elsewhere in
this  Agreement,  between  the date of this  Agreement  and the  earlier  of the
Effective Time or  termination  of this Agreement  pursuant to Article VIII, STI
agrees,  except as may be  consented  to by the other  parties  or as  otherwise
contemplated by this Agreement, as follows:

            5.5.1  Restriction  on  Transfers.  STI  shall  not  enter  into any
agreement to sell, transfer,  pledge,  hypothecate,  or dispose of any shares of
the Sub Common Stock, except pursuant to this Agreement.

            5.5.2 Preservation of Vote. STI shall not withdraw,  rescind, change
or modify its vote in favor of this Agreement, the Merger and other transactions
contemplated by this Agreement.

            5.5.3  SEC  Confirmation.  STI  shall  use  commercially  reasonable
efforts to obtain  written  confirmation  from the SEC that it may  satisfy  the
financial  statement  requirements of Item 7 of Form 8-K with respect to the HSW
Assets by  filing  audited  and pro forma  statements  of  assets  acquired  and
liabilities  assumed and of revenues  and direct  expenses  for each of the last
three fiscal years (the "SEC Confirmation").

            5.5.4 Interim Financial Statements. STI shall deliver to OmniAmerica
not later  than the 45th  Business  Day after the end of each  month,  financial
statements  of the kind  described in Section  4.3.6 for the month ended January
1998 and each subsequent month before Closing.

            5.5.5 Conduct of Business.  Unless otherwise expressly  contemplated
hereby  (including  the STI  Permitted  Transactions)  or approved in writing by
OmniAmerica,  OmniAmericaSub or OmniPartners, STI agrees that the businesses and
operations  of STI and the Sub shall be  conducted  only in, and STI and the Sub
shall not take any material  action  except in, the ordinary  course of business
and consistent with past practice,  including,  without limitation,  in material
compliance with all applicable laws, rules and regulations,  including the rules
and regulations of the FAA and FCC.  Without  limitation,  STI and the Sub shall
not take, nor enter into any  agreements to take,  any of the following  actions
except in each such case in connection  with this  Agreement  (including the STI
Permitted   Transactions)   or   consented   to  in  writing   by   OmniAmerica,
OmniAmericaSub or OmniPartners (which consent


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<PAGE>






may not be  unreasonably  withheld)  or,  in the case of  actions  described  in
clauses (a) - (c) of this  Section  5.5.5,  in the  ordinary  course of business
consistent with past practice:  (a) dispose of, or acquire,  or agree to dispose
of or acquire, any material assets,  other than the STI Permitted  Transactions,
(b) incur any  indebtedness  for borrowed  money,  except in the ordinary course
pursuant to its  existing  lines of credit,  (c) pay any  discretionary  bonuses
(other  than  bonuses  already  accrued  on the date  hereof)  to,  or alter the
compensation  or benefit of, any director,  officer or employee,  (d) enter into
any transaction or agreement with any Affiliate or associate (as defined in Rule
405 under the Securities  Act),  (e) institute any material  reduction in force,
(f) close any office,  base or station,  (g) take any action not in the ordinary
course of business that will knowingly cause any of such party's representations
or  warranties to be untrue or incorrect in any material  respect,  (h) omit any
commercially reasonable action that such party would take in the ordinary course
of  business,   which  omission  will  knowingly   cause  any  of  such  party's
representations or warranties to be untrue or incorrect in any material respect,
(i) declare,  set aside or pay any  dividends  on, or make any  distribution  or
payment with respect to, or redeem or  repurchase,  any shares of capital stock,
options,  warrants,  debt  securities,  or any  securities  convertible  into or
exchangeable for or exercisable for shares of capital stock of any of such party
or take any other  actions  which would have a similar  effect,  (j) amend STI's
articles of incorporation or bylaws or the Sub's certificate of incorporation or
bylaws  or  (k)  issue  any  shares  of  capital  stock  of  such  party  or its
Subsidiaries or any securities,  options,  warrants, rights, calls, commitments,
plans,  contracts or other agreements of any character  whatsoever which provide
for the purchase,  issuance or transfer of any shares of capital  stock,  or any
securities that are convertible  into or exchangeable  for any shares of capital
stock or increase  or  decrease,  change into or exchange  any such shares for a
different  number  or kind of  shares or  securities  through a  reorganization,
recapitalization,  reclassification,  stock dividend, stock split, reverse stock
split, or other similar change in capitalization. Notwithstanding the foregoing,
the  parties  hereto  expressly  agree that STI and the Sub shall be entitled to
enter into agreements to build towers for themselves or third parties,  provided
that each such agreement  would not be required to be disclosed in a filing with
the SEC pursuant to Item  601(b)(10) of Regulation S-K  promulgated  pursuant to
the Securities Act.

            5.5.6 Compliance with Nevada Corporation Law. STI agrees to take all
necessary  action  to  ensure  that  the  Merger  and  the  other   transactions
contemplated  by the Merger  Agreement  will be exempt  from the  provisions  of
Sections 78.378 to 78.3793 of the Nevada Revised Statutes.

                                  ARTICLE VI
                        CONDITIONS PRECEDENT TO CLOSING

      6.1  Conditions   Precedent  to  Obligations  of  STI  and  the  Sub.  The
obligations  of STI and the Sub under  this  Agreement  shall be  subject to the
fulfillment of each and all of the following conditions at or before the Closing
(unless an earlier  time is  specified  in this  Agreement,  in which case on or
before such earlier time), each of which is individually hereby deemed material,
and any one or more of which may be waived in writing by STI:


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<PAGE>







            6.1.1  Representations  and Warranties.  Each of the representations
and warranties made by OmniAmerica, OmniAmericaSub and OmniPartners contained in
this  Agreement  shall be true and  correct as of the date when made and (except
for changes  contemplated  by this  Agreement  and except to the extent any such
representation  or  warranty  speaks  of an  earlier  date,  in which  case such
representation  or  warranty  shall have been true and  correct as of such date)
shall be true and correct on and as of the  Closing  Date to the same extent and
with the same effect as if made on and as of the Closing  Date;  provided,  that
this  condition  shall  be  deemed  to be  satisfied  notwithstanding  that  any
representation or warranty may not be true and correct so long as the same shall
not reasonably be expected to have a Material Adverse Effect on OmniAmerica.

            6.1.2 Performance by OmniAmerica,  OmniAmericaSub  and OmniPartners.
OmniAmerica, OmniAmericaSub and OmniPartners each shall have fully performed and
complied  with  all  covenants,  agreements  and  conditions  required  by  this
Agreement to be  performed or complied  with by it on or before the Closing Date
(unless an earlier  time is  specified  in this  Agreement,  in which case on or
before such earlier  time),  including,  without  limitation,  the execution and
delivery by it of all  documents  and  instruments  required  under the terms of
Article VII of this Agreement;  provided, that this condition shall be deemed to
be satisfied  notwithstanding  that any such obligation (other than the delivery
of the documents under Article VII) shall not have been so performed or complied
with so long as the same shall not  reasonably  be  expected  to have a Material
Adverse Effect on OmniAmerica.

            6.1.3 Regulatory Approvals and Consents.  There shall have been duly
and validly obtained all consents, approvals, authorizations, permits and orders
of all  federal,  state,  foreign  and other  governmental  regulatory  agencies
required  in  connection  with  this  Agreement  and  the  consummation  of  the
transactions  contemplated hereby,  including under the HSR Act, the OmniAmerica
Consents,  the  OmniPartners  Consents,  the  STI  Consents  and  all  consents,
approvals, authorizations,  permits and orders shall be in full force and effect
as of the  Closing  Date,  except  in each  case  for any  consents,  approvals,
authorizations,  permits  or orders  the  failure  of which to obtain  would not
reasonably be expected to have a Material Adverse Effect on OmniAmerica.

            6.1.4  No Court  Orders.  On the  Closing  Date,  there  shall be no
effective  injunction,  writ,  temporary  restraining  order or any order of any
nature issued by any Governmental Entity of competent jurisdiction (i) directing
that the transactions  contemplated  herein or any of them not be consummated as
herein provided or (ii) awarding  damages or any other remedy to any Person with
respect to any of the transactions contemplated hereby, nor shall any Proceeding
by any Governmental Entity seeking any of the foregoing be pending.  There shall
not be any action taken,  or any statute,  rule,  regulation  or order  enacted,
entered or enforced which makes the consummation of the Merger illegal.

            6.1.5 No Material  Adverse  Change.  There  shall not have  occurred
since the date hereof any change,  effect,  event or occurrence in the business,
properties, assets, condition (financial or otherwise),  prospects or results of
operations of OmniAmerica,


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<PAGE>






OmniAmericaSub  or  OmniPartners,  except for such changes,  effects,  events or
occurrences  that do not have,  and cannot  reasonably  be expected  to have,  a
Material Adverse Effect on OmniAmerica.

            6.1.6 Certificates of OmniAmerica,  OmniAmericaSub and OmniPartners.
OmniAmerica  shall have provided to STI a  certificate,  dated the Closing Date,
executed by  OmniAmerica  confirming  that the  conditions  in Section 6.1.1 and
Section 6.1.2 as to OmniAmerica have been satisfied.  OmniAmericaSub  shall have
provided  to  STI  a   certificate,   dated  the  Closing   Date,   executed  by
OmniAmericaSub confirming that the conditions in Section 6.1.1 and Section 6.1.2
as to OmniAmericaSub  have been satisfied.  OmniPartners  shall have provided to
STI a certificate,  dated the Closing Date, executed by OmniPartners  confirming
that the conditions in Section 6.1.1 and Section 6.1.2 as to  OmniPartners  have
been satisfied.

            6.1.7  Opinion  of  OmniAmerica's  Counsel.  OmniAmerica  shall have
delivered  to STI at the  Closing the opinion of  OmniAmerica's  counsel,  Weil,
Gotshal  &  Manges  LLP,  which  opinion  shall be dated  the  Closing  Date and
addressed to STI, substantially in the form attached hereto as Exhibit 6.1.7.

            6.1.8  Audited   Financial   Statements   and  Auditors'   Consents.
OmniAmerica shall have delivered to STI the Audited Financial Statements and STI
shall  have no  reasonable  reason  to  believe  that it will  not  receive  the
Auditors' Consents when necessary to make its SEC Filings.

            6.1.9 Good Standing.  OmniAmerica shall have furnished to STI at the
Closing  certificates of the appropriate  governmental  officials,  dated within
thirty (30) days of the Closing Date,  confirming  that  OmniAmerica  is in good
standing and is duly qualified to transact business in the State of Delaware and
in each jurisdiction listed as a foreign jurisdiction on the Disclosure Schedule
and that  OmniAmericaSub  is in good standing and is duly  qualified to transact
business in the State of Delaware and in each  jurisdiction  listed as a foreign
jurisdiction  on the  Disclosure  Schedule,  unless  the  failure  to be in good
standing or so qualified would not, individually or in the aggregate, reasonably
be expected to have a Material Adverse Effect on OmniAmerica.

            6.1.10  Related  Agreements.  The parties to the Related  Agreements
(other  than STI and the Sub) shall have  executed  and  delivered  the  Related
Agreements to which each is a party; provided,  however, that only OmniPartners,
HMTF, Carl E. Hirsch, Anthony S. Ocepek and Jerome C. Kline shall be required to
execute and deliver the Post-Merger Stockholders Agreement.

            6.1.11 Termination of Affiliate Contracts. All OmniAmerica Affiliate
Contracts shall have been terminated.



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<PAGE>






            6.1.12  Fairness Opinion.  The Fairness Opinion  shall not have been
withdrawn or materially and adversely modified.

            6.1.13  HMTF Affiliate.  OmniPartners shall be an Affiliate of HMTF.

            6.1.14 No Foreseen  Material  Adverse  Effect.  STI shall not have a
reasonable belief that the acquisition of the Acquired  Businesses in accordance
with the terms and conditions of this Agreement and the Related  Agreements will
or  reasonably  could  result in STI  becoming  liable  for any of the  Acquired
Businesses'  liabilities or  obligations of any nature  (whether or not accrued,
contingent  or  otherwise,  and whether due or to become due) related to periods
prior to OmniAmerica's or  OmniAmericaSub's  acquisition of the related Acquired
Business  (other than such  liabilities  and  obligations as are included in the
OmniAmerica  Financial  Statements)  which in the  aggregate  will or reasonably
could result in a Material Adverse Effect on STI.

            6.1.15 Receipt of SEC Confirmation.  STI shall have received the SEC
Confirmation.

            6.1.16 Short-Term Liabilities.  OmniAmericaSub's  aggregate accounts
payable and other  short-term  liabilities  (other than liabilities for unearned
revenue)  that would be set forth on a balance  sheet of  OmniAmerica  dated the
Closing  Date shall not exceed  $500,000  (not  including  expenses  incurred in
connection with or related to the Merger), all of which shall have been incurred
in the ordinary course of business.

            6.1.17 HSW Merger.  The HSW Merger shall have been consummated prior
to the Effective Time.

      6.2 Conditions Precedent to Obligations of OmniAmerica, OmniAmericaSub and
OmniPartners.  The obligations of OmniAmerica,  OmniAmericaSub  and OmniPartners
under this Agreement  shall be subject to the fulfillment of each and all of the
following  conditions  at or before  the  Closing  (unless  an  earlier  time is
specified in this  Agreement,  in which case on or before such specified  time),
each of which is  individually  hereby deemed  material,  and any one or more of
which may be waived in writing by OmniAmerica, OmniAmericaSub or OmniPartners.

            6.2.1  Representations  and Warranties.  Each of the representations
and warranties made by STI and the Sub contained in this Agreement shall be true
and correct as of the date when made and (except  for  changes  contemplated  by
this Agreement and except to the extent that any such representation or warranty
speaks of an earlier date, in which case such  representation  or warranty shall
have been true and  correct as of such date) shall be true and correct on and as
of the  Closing  Date to the same  extent and with the same effect as if made on
and as of the Closing Date; provided,  that this condition shall be deemed to be
satisfied  notwithstanding  that any  representation or warranty may not be true
and  correct  so long as the same shall not  reasonably  be  expected  to have a
Material Adverse Effect on STI.


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<PAGE>







            6.2.2  Performance  by STI and the Sub.  STI and the Sub each  shall
have fully performed and complied with all covenants,  agreements and conditions
required by this  Agreement to be performed or complied  with by it on or before
the Closing Date (unless an earlier  time is  specified  in this  Agreement,  in
which case on or before such earlier time),  including without  limitation,  the
execution and delivery by it of all documents and instruments required under the
terms of Article VII of this Agreement;  provided,  that this condition shall be
deemed to be satisfied  notwithstanding that any such obligation (other than the
delivery of the documents under Article VII) shall not have been so performed or
complied  with so long as the same shall not  reasonably  be  expected to have a
Material Adverse Effect on STI.

            6.2.3 Regulatory Approvals and Consents.  There shall have been duly
and validly obtained all consents, approvals, authorizations, permits and orders
of all  federal,  state,  foreign  and other  governmental  regulatory  agencies
required  in  connection  with  this  Agreement  and  the  consummation  of  the
transactions  contemplated hereby,  including under the HSR Act, the OmniAmerica
Consents,  the  OmniPartners  Consents,  the STI Consents and all such consents,
approvals, authorizations,  permits and orders shall be in full force and effect
as of the  Closing  Date,  except  in  each  case  for  any  consent,  approval,
authorization,  permit  or  order  the  failure  of which to  obtain  would  not
reasonably be expected to have a Material Adverse Effect on STI.

            6.2.4  No Court  Orders.  On the  Closing  Date,  there  shall be no
effective  injunction,  writ,  temporary  restraining  order or any order of any
nature issued by any Governmental Entity of competent jurisdiction (i) directing
that the transactions  contemplated  herein or any of them not be consummated as
herein provided or (ii) awarding  damages or any other remedy to any Person with
respect to any of the transactions contemplated hereby, nor shall any Proceeding
by any Governmental Entity seeking any of the foregoing be pending.  There shall
not be any action taken,  or any statute,  rule,  regulation  or order  enacted,
entered or enforced which makes the consummation of the Merger illegal.

            6.2.5 No Material  Adverse  Change.  There  shall not have  occurred
since the date hereof any change,  effect,  event or occurrence in the business,
properties, assets, condition (financial or otherwise),  prospects or results of
operations of STI, except for such changes,  effects,  event or occurrences that
do not have,  and cannot  reasonably  be  expected to have,  a Material  Adverse
Effect on STI.

            6.2.6  Certificates  of STI and the Sub.  STI and the Sub shall have
furnished to OmniAmerica  certificates,  dated the Closing Date, executed by STI
and the Sub,  respectively,  confirming that the conditions in Section 6.2.1 and
Section 6.2.2 have been satisfied.

            6.2.7  Opinions  of STI's  Counsel.  STI  shall  have  delivered  to
OmniPartners at the Closing the opinions of STI's counsel, Haynes and Boone, LLP
and Jones,  Vargas, which opinions shall be dated the Closing Date and addressed
to OmniPartners,  substantially in the forms attached hereto as Exhibit 6.2.7(a)
and Exhibit 6.2.7(b), respectively.



                                     65



<PAGE>






            6.2.8 Good Standing.  STI shall have furnished to OmniAmerica at the
Closing  certificates of the appropriate  governmental  officials,  dated within
fifteen  (15)  days of the  Closing  Date,  confirming  (a)  that STI is in good
standing  and duly  qualified to transact  business in the State of Nevada,  (b)
that the Sub is in good standing and duly qualified to transact  business in the
State of Delaware and (c) that STI and the Sub are in good standing and are duly
qualified  to  transact  business  in  each  jurisdiction  listed  as a  foreign
jurisdiction  on the  Disclosure  Schedule,  unless  the  failure  to be in good
standing or so qualified would not, individually or in the aggregate, reasonably
be expected to have a Material Adverse Effect on STI.

            6.2.9  Related  Agreements.  The parties to the  Related  Agreements
(other than  OmniAmerica,  OmniAmericaSub,  OmniPartners  and HM Partners) shall
have  executed and  delivered  the Related  Agreements to which each is a party;
provided, however, that only Budagher and Carpenter shall be required to execute
and deliver the Post-Merger Stockholders Agreement.

            6.2.10 Tax Opinion.  OmniAmerica  shall have  received an opinion of
Weil, Gotshal & Manges LLP or other law or professional  service firm reasonably
acceptable to OmniAmerica, substantially in the form of Exhibit 6.2.10(a), which
opinion shall be based upon  certificates of OmniAmerica,  OmniPartners  and STI
substantially  in  the  forms  (respectively)  of  Exhibit  6.2.10(b),   Exhibit
6.2.10(c) and Exhibit 6.2.10(d).


                                  ARTICLE VII
                       CLOSING AND DELIVERY OF DOCUMENTS

      At  the  Closing,  the  following  shall  occur  as  a  single  integrated
transaction:

      7.1 Deliveries by OmniAmerica,  OmniAmericaSub  and  OmniPartners.  At the
Closing,  OmniAmerica,  OmniAmericaSub  and OmniPartners  shall use commercially
reasonable  efforts  to deliver or cause to be  delivered  to STI the  following
items:

          (a) The stock certificates representing the OmniAmerica Common Stock;

          (b) The opinion of OmniAmerica's counsel described in Section 6.1.7;

          (c) Copies of the OmniAmerica Consents and the OmniPartners Consents;

          (d) The certificates identified in Section 6.1.6 hereof;

          (e) The good standing certificates identified in Section 6.1.9 hereof;
     and

          (f) Copies,  certified or otherwise  identified to STI's satisfaction,
     of all corporate  documents that STI shall  reasonably  request,  including
     resolutions of the


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     board of directors (or a written  consent in lieu  thereof) of  OmniAmerica
     and  resolutions  of the sole  stockholder  (or a written  consent  in lieu
     thereof) of  OmniAmerica,  dated on or before the date hereof to  authorize
     this Agreement, the Merger, the Related Agreements and the transactions and
     other acts contemplated either by this Agreement or the Related Agreements.

      7.2  Delivery by STI.  At the  Closing,  STI shall  deliver or cause to be
delivered to OmniPartners the following items:

          (a) The Merger Consideration in accordance with Section 3.2;

          (b) The opinions of STI's counsel described in Section 6.2.7;

          (c) Copies of the STI Consents;

          (d) The certificates identified in Section 6.2.6 hereof;

          (e) Evidence of payment of the Wasserstein Perella & Co. fee;

          (f) The good standing certificates identified in Section 6.2.8 hereof;
     and

          (g)  Copies,   certified  or  otherwise  identified  to  OmniPartners'
     satisfaction, of all corporate documents that OmniPartners shall reasonably
     request,  including  resolutions  of the boards of  directors  (or  written
     consents in lieu  thereof) of STI and the Sub and a written  consent of the
     sole  stockholder  of the  Sub,  dated on or  before  the  date  hereof  to
     authorize  this  Agreement,  the  Merger,  the Related  Agreements  and the
     transactions  and other acts  contemplated  either by this Agreement or the
     Related Agreements.

      7.3 Related Agreements. At the Closing, the parties, as appropriate, shall
execute and deliver the following documents (the "Related Agreements"):

            (a) A  Post-Merger  Stockholders  Agreement,  effective  as  of  the
      Closing Date, among Budagher, Carpenter,  OmniPartners,  STI and the other
      parties thereto, the form of which is attached as Exhibit 7.3(a).

            (b) A  Monitoring  and  Oversight  Agreement,  effective  as of  the
      Closing Date, among STI, the Sub, OmniAmerica, OmniAmericaSub, HM Partners
      and the other  parties  thereto,  the form of which is attached as Exhibit
      7.3(b).

            (c) A  Financial  Advisory  Agreement,  effective  as of the Closing
      Date, among STI, the Sub, OmniAmerica, OmniAmericaSub, HM Partners and the
      other parties thereto, the form of which is attached as Exhibit 7.3(c).



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<PAGE>







                                 ARTICLE VIII
                                  TERMINATION

      8.1 Reasons for  Termination.  This  Agreement may be  terminated  and the
Merger abandoned before the Closing as follows:

            8.1.1  By Mutual Consent.  By  the mutual  written  consent  of  the
parties.

            8.1.2  By STI.  So long  as STI or the Sub is not  then in  material
breach of its obligations hereunder,  by STI after compliance with the procedure
set forth in this  Article,  if (i) any of  OmniAmerica's,  OmniAmericaSub's  or
OmniPartners'  representations  or  warranties  contained  herein  is  untrue or
incorrect  and the basis for such  untruth or  incorrectness  has caused,  or is
reasonably  likely to cause,  STI,  OmniAmerica  or  OmniAmericaSub  to suffer a
Material Adverse Effect, (ii) OmniAmerica,  OmniAmericaSub or OmniPartners fails
to perform any of its covenants or agreements  contained  herein and such Breach
has caused, or is reasonably likely to cause, STI, OmniAmerica or OmniAmericaSub
to suffer a Material Adverse Effect,  (iii) any  Governmental  Entity shall have
issued an  order,  injunction,  decree  or  ruling  or taken  any  other  action
permanently  enjoining,  restraining or otherwise  permanently  prohibiting  the
Merger and such order,  injunction,  decree,  ruling or other  action shall have
become  final and  nonappealable  (other  than an order  arising  as a result of
litigation  between or in respect of STI and its stockholders);  provided,  that
such order, injunction, decree, ruling or other action does not result primarily
from acts or omissions not in the ordinary course of business following the date
hereof on the part of STI or its Affiliates in conducting  STI's  operations and
activities,  or (iv) any of the conditions to the consummation by STI or the Sub
of the transactions provided for herein shall have become impossible to satisfy;
provided,  that a willful  material  Breach of this  Agreement  by  OmniAmerica,
OmniAmericaSub or OmniPartners that is reasonably likely to result in a Material
Adverse Effect on OmniAmerica, OmniAmericaSub or OmniPartners shall be deemed to
cause such  conditions  to be incapable of being  satisfied for purposes of this
Section 8.1.2. In addition, STI may terminate this Agreement immediately without
complying  with the  provisions  of  Sections  8.2 or 8.3 if (i) STI's  Board of
Directors  reasonably  believes  that  an  Acquisition  Proposal  is a  Superior
Proposal and (ii) the ten Business Day period  referred to in Section  5.1.3 has
expired; provided, that notwithstanding the foregoing, the provisions of Section
8.6  shall  expressly  survive.   Further,  STI  may  terminate  this  Agreement
immediately  without complying with the provisions of Sections 8.2 or 8.3 if the
condition  contained in Section 6.2.10 is not satisfied and all other conditions
set forth in Section 6.2 are, or are able to be, satisfied.

            8.1.3  By  OmniAmerica.  So long  as  OmniAmerica,  OmniPartners  or
OmniAmericaSub is not then in material breach of its obligations  hereunder,  by
OmniAmerica  after  compliance with the procedure set forth in this Article,  if
(i) any of STI's or the Sub's  representations or warranties contained herein is
untrue or incorrect and the basis for such untruth or incorrectness  has caused,
or is reasonably likely to cause, STI, OmniAmerica or OmniAmericaSub to suffer a
Material  Adverse  Effect,  (ii)  STI or the Sub  fails  to  perform  any of its
covenants  or  agreements  contained  herein and such Breach has  caused,  or is
reasonably


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likely to cause, STI, OmniAmerica or OmniAmericaSub to suffer a Material Adverse
Effect,  (iii) any Governmental  Entity shall have issued an order,  injunction,
decree or ruling or taken any other action permanently enjoining, restraining or
otherwise permanently prohibiting the Merger and such order, injunction, decree,
ruling or other action shall have become final and nonappealable  (other than an
order arising as a result of litigation between or in respect of OmniAmerica and
its Affiliates);  provided that such order, injunction,  decree, ruling or other
action does not result  primarily  from acts or  omissions  not in the  ordinary
course of business  following the date hereof on the part of  OmniAmerica or its
Affiliates in conducting OmniAmerica's operations and activities, or (iv) any of
the  conditions  to  the   consummation   by  OmniAmerica,   OmniAmericaSub   or
OmniPartners of the transactions  provided for herein shall become impossible to
satisfy;  provided, that a Material Breach Termination by STI or the Sub that is
reasonably likely to result in a Material Adverse Effect on STI or the Sub shall
be deemed to cause  such  conditions  to be  incapable  of being  satisfied  for
purposes of this Section 8.1.3.

            8.1.4 Drop-Dead Date. By OmniAmerica or STI if the Closing shall not
have occurred by the Termination Date, provided,  such date shall be extended by
the number of days,  if any,  to cure any matter that is the subject of a notice
under  Section  8.3 (STI  Termination  Procedure)  or Section  8.4  (OmniAmerica
Termination Procedure).

      8.2 Notice of Problems.  Each party will promptly  give written  notice to
the other parties when any of them becomes aware of the occurrence or failure to
occur,  or the  impending or threatened  occurrence or failure to occur,  of any
fact or event that  would  cause or  constitute,  or would be likely to cause or
constitute (a) any of its  representations or warranties  contained herein being
untrue or incorrect in any material  respect,  (b) its failure to perform in any
material respect any of its covenants or agreements  contained herein or (c) any
of the  conditions  to Closing set forth in Article VI it must satisfy  being or
becoming impossible to satisfy. No such notice shall affect the representations,
warranties,  covenants,  agreements or  conditions  of the parties  hereunder or
their   liability   therefor,   or  prevent  any  party  from   relying  on  the
representations and warranties contained herein.

      8.3 STI  Termination  Procedure.  If STI discovers,  by reason of a notice
given  pursuant to this Agreement or otherwise,  that (a) any of  OmniAmerica's,
OmniAmericaSub's  or  OmniPartners'  representations  or warranties is untrue or
incorrect when made and the basis for such untruth or incorrectness  has caused,
or is reasonably likely to cause, STI, OmniAmerica or OmniAmericaSub to suffer a
Material  Adverse Effect,  (b) OmniAmerica,  OmniAmericaSub  or OmniPartners has
failed to perform any of its  covenants or  agreements  contained  herein in any
material respect,  and such Breach has caused, or is reasonably likely to cause,
STI,  OmniAmerica or  OmniAmericaSub  to suffer a Material Adverse Effect or (c)
any of the  conditions  to STI's or the  Sub's  obligations  to  consummate  the
transactions provided for herein have become impossible to satisfy, then STI may
deliver a notice to  OmniAmerica  of such event,  specifying  the factual  basis
therefor in reasonable  detail.  OmniAmerica,  OmniAmericaSub  and  OmniPartners
shall have the right to cure any matter referred to in clause (a) or (b) of this
Section within fifteen (15) Business Days following the date of delivery


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<PAGE>






of such  notice.  Upon such notice  and, in the case of clause (a) or (b),  upon
OmniAmerica's,  OmniAmericaSub's  and  OmniPartners'  failure  to cure,  STI may
terminate this Agreement by giving a notice of termination to OmniAmerica.

      8.4 OmniAmerica's Termination Procedure. If OmniAmerica, OmniAmericaSub or
OmniPartners  discovers,  by reason of a notice given pursuant to this Agreement
or otherwise,  that (a) any of STI's or the Sub's  representations or warranties
is untrue or incorrect when made and the basis for such untruth or incorrectness
has caused, or is reasonably likely to cause, STI, OmniAmerica or OmniAmericaSub
to suffer a Material  Adverse  Effect,  (b) STI or the Sub has failed to perform
any of its covenants or agreements  contained herein in any material respect and
such Breach has caused, or is reasonably  likely to cause,  STI,  OmniAmerica or
OmniAmericaSub  to suffer a Material Adverse Effect or (c) any of the conditions
to OmniAmerica's,  OmniAmericaSub's  or OmniPartners'  obligations to consummate
the  transactions  provided for herein has become  impossible  to satisfy,  then
OmniAmerica  may deliver a notice to STI of such event,  specifying  the factual
basis  therefor in  reasonable  detail.  STI and the Sub shall have the right to
cure any matter  referred to in clause (a) or (b) of this Section within fifteen
(15)  Business  Days  following  the date of delivery of such notice.  Upon such
notice and, in the case of clause (a) or (b),  upon STI's and the Sub's  failure
to cure,  OmniAmerica  may  terminate  this  Agreement  by  giving  a notice  of
termination to STI.

      8.5 Effect of Termination.  Upon termination of this Agreement pursuant to
this  Article,  no party shall have any  liability or  continuing  obligation to
another  party  arising  out of  this  Agreement,  or out of  actions  taken  in
connection with this Agreement,  except that Sections 8.5 and 8.6 and Article IX
shall survive  termination  of this  Agreement.  Notwithstanding  the foregoing,
termination of this Agreement shall not relieve any party from its liability for
the Breach, prior to termination, of its covenants or agreements.

Termination  Fee. In the event the Merger and the  transactions  contemplated by
this  Agreement  have not been  consummated  on or prior to June 30,  1998 or as
extended by mutual agreement of the parties hereto (the "Termination  Date") and
(a) such  failure is the result of STI's  willful  material  Breach (a "Material
Breach Termination"),  or, (b) in the alternative,  STI (i) determines to accept
an  Acquisition   Proposal  at  any  time  prior  to  the  Termination  Date  (a
"Pre-Termination Date Termination"), or (ii) enters into an Acquisition Proposal
within twelve (12) months from the Termination  Date with any party with whom it
has had discussions  regarding an Acquisition  Proposal prior to the Termination
Date (or with any party that initiates an Acquisition Proposal subsequent to the
Termination  Date to  overbid an  Acquisition  Proposal  initiated  prior to the
Termination  Date)  (a  "Post-Termination  Date  Termination"),  STI will pay to
OmniAmerica on the  Applicable  Date (as defined below) in cash by wire transfer
of  immediately  available  funds to an  account  designated  by  OmniAmerica  a
termination fee in an amount equal to $4.5 million,  plus reasonable  documented
out-of-pocket  expenses (the "STI  Termination  Fee") incurred by OmniAmerica in
connection with the transactions  contemplated  hereby.  "Applicable Date" means
(i) in the case of a  Material  Breach  Termination  or a  Pre-Termination  Date
Termination,  concurrently  with  such  termination,  or (ii)  in the  case of a
Post-Termination  Date  Termination,  upon  consummation of any such Acquisition
Proposal. In


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<PAGE>






the event the Merger and the  transactions  contemplated  by this Agreement have
not been consummated on or prior to the Termination Date and such failure is the
result of OmniAmerica's willful material Breach,  OmniAmerica will pay to STI in
cash by wire transfer of immediately available funds to an account designated by
STI a  termination  fee in an  amount  equal to $4.5  million,  plus  reasonable
documented  out-of-pocket expenses (the "OmniAmerica  Termination Fee") incurred
by STI in connection with the transactions contemplated hereby concurrently with
such  termination.  STI's receipt of the  OmniAmerica  Termination  Fee shall be
STI's,  the Sub's and their  Affiliates' sole and exclusive remedy for a willful
material   breach  of  the   representations   or  warranties  of   OmniAmerica,
OmniAmericaSub or OmniPartners. OmniAmerica's receipt of the STI Termination Fee
shall be  OmniAmerica's,  OmniAmericaSub's,  OmniPartners' and their Affiliates'
sole and exclusive remedy for a willful  material breach of the  representations
or  warranties  of STI or the Sub.  Except as provided in this Section 8.6, each
party's remedies for a Breach of this Agreement shall be cumulative  rather than
mutually exclusive.


                                  ARTICLE IX
                                 MISCELLANEOUS

      9.1   [Intentionally Deleted]

      9.2 Survival.  The  representations  and warranties required to be made by
STI, the Sub,  OmniAmerica,  OmniAmericaSub and OmniPartners,  respectively,  in
this Agreement,  or in any certificate  delivered by STI, the Sub,  OmniAmerica,
OmniAmericaSub or OmniPartners,  respectively,  pursuant hereto will not survive
the Closing;  provided, that the representation and warranty of STI contained in
Section  4.3.2 shall survive the Closing  indefinitely;  provided  further,  the
representations  and warranties of STI set forth in Section 4.3.29 shall survive
the Closing until December 31, 1998 (the "Survival Period"). Notwithstanding any
provision to the  contrary  herein,  no party  hereto  shall have any  liability
following  Closing for a Breach of this  Agreement  prior to Closing;  provided,
that (i) STI  shall be liable  to  OmniPartners,  its  successors  and  assigns,
following   Closing  for  a  Breach  of  Section  4.3.2,   which  shall  survive
indefinitely,  and (ii) STI shall be liable to OmniPartners,  its successors and
assigns,  following  Closing for a Breach of Section  4.3.29 for the term of the
Survival Period.

      9.3 Expenses. If the transactions contemplated hereby are not consummated,
each of the  parties  hereto  shall bear all fees and  expenses  relating  to or
arising from its  compliance  with the various  provisions of this Agreement and
such  party's  covenants  to be  performed  hereunder,  and except as  otherwise
specifically  provided for herein,  each of the parties hereto agrees to pay all
of its own expenses (including, without limitation,  attorneys' and accountants'
fees) incurred in connection with this Agreement, the transactions  contemplated
hereby,  the  negotiations  leading  to the same and the  preparations  made for
carrying the same into effect,  and, to the extent practical,  all such fees and
expenses of the parties hereto shall be paid prior


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to Closing.  If the transactions  contemplated  hereby are consummated,  STI and
OmniAmerica shall bear all the foregoing fees and expenses.

      9.4 Notices. Any notice,  request,  instruction or other document required
by the terms of this  Agreement,  or deemed by any of the  parties  hereto to be
desirable,  to be given to any other party  hereto shall be in writing and shall
be given by prepaid telex or telecopy or delivered or mailed by certified  mail,
postage prepaid, with return receipt requested, to the following addresses:

      If to OmniAmerica             OmniAmerica, Inc.
      or OmniAmericaSub             11111 Santa Monica Blvd.
                                    Los Angeles, California  90025
                                    Attention:  Carl E. Hirsch
                                    Telephone:  (310) 478-1111
                                    Telecopy:   (310) 445-4606

      With copies to:               Hicks, Muse, Tate & Furst Incorporated
                                    200 Crescent Court, Suite 1600
                                    Dallas, Texas  75201
                                    Attention:  Lawrence D. Stuart, Jr.
                                                Daniel S. Dross
                                    Telephone:  (214) 740-7300
                                    Telecopy:   (214) 740-7313

                                    and

                                    Weil, Gotshal & Manges LLP
                                    100 Crescent Court, Suite 1300
                                    Dallas, Texas  75201
                                    Attention:  Mary R. Korby, Esq.
                                    Telephone:  (214) 746-7700
                                    Telecopy:   (214) 746-7777

      If to OmniPartners or         HMTF/Omni Partners, L.P.
      Omni/HSW Acquisition:         200 Crescent Court, Suite 1600
                                    Dallas, Texas  75201
                                    Attention:  Lawrence D. Stuart, Jr.
                                                Daniel S. Dross
                                    Telephone:  (214) 740-7300
                                    Telecopy:   (214) 740-7313



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      With copies to:               Hicks, Muse, Tate & Furst Incorporated
                                    200 Crescent Court, Suite 1600
                                    Dallas, Texas  75201
                                    Attention:  Lawrence D. Stuart, Jr.
                                                Daniel S. Dross
                                    Telephone:  (214) 740-7300
                                    Telecopy:   (214) 740-7313

                                    and

                                    Weil, Gotshal & Manges LLP
                                    100 Crescent Court, Suite 1300
                                    Dallas, Texas  75201
                                    Attention:  Mary R. Korby, Esq.
                                    Telephone:  (214) 746-7700
                                    Telecopy:   (214) 746-7777

      If to STI or the Sub:         Specialty Teleconstructors, Inc.
                                    12001 Highway 14 North
                                    Cedar Crest, New Mexico  87008
                                    Attention:  Michael R. Budagher
                                                Jeffrey A. Howard
                                    Telephone:  (505) 281-2197
                                    Telecopy:   (505) 281-8652

      With a copy to:               Greg R. Samuel, Esq.
                                    Haynes and Boone, LLP
                                    901 Main Street, Suite 3100
                                    Dallas, Texas 75202-3789
                                    Telephone:  (214) 651-5000
                                    Telecopy:   (214) 200-0577

      The persons and addresses set forth above may be changed from time to time
by a notice sent as aforesaid. If notice is given by delivery in accordance with
the provisions of this Section,  said notice shall be conclusively  deemed given
at the time of such delivery.  If notice is given by mail in accordance with the
provisions of this Section,  such notice shall be conclusively deemed given upon
the second Business Day following  deposit thereof in the United States mail. If
notice is given by telex or telecopy in accordance  with the  provisions of this
Section, such notice shall be conclusively deemed given upon receipt.

      9.5  Entire  Agreement.  This  Agreement  (together  with  the  Disclosure
Schedules, the Subsequent Disclosure Schedules and exhibits hereto), the Related
Agreements,  and the other  documents  delivered  pursuant hereto and referenced
herein set forth the entire  agreement and  understanding  of the parties hereto
with respect to the transactions contemplated hereby, and


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supersede all other prior agreements, arrangements and understandings related to
the subject matter hereof, including without limitation, (i) that certain letter
agreement  dated January 13, 1998 by and between STI and  OmniAmerica,  (ii) the
Confidentiality Agreements between OmniAmericaSub and STI dated October 29, 1997
and October 31, 1997 and (iii) the Prior  Merger  Agreement.  No  understanding,
promise, inducement, statement of intention, representation,  warranty, covenant
or  condition,  written  or oral,  express  or  implied,  whether  by statute or
otherwise,  has been made by any party hereto with respect to the subject matter
hereof  which is not  embodied in this  Agreement,  and no party hereto shall be
bound  by  or  liable  for  any  alleged  understanding,   promise,  inducement,
statement, representation, warranty, covenant or condition not so set forth with
respect to the subject matter hereof.

      9.6 Headings.  The headings  contained in this Agreement are for reference
purposes only and shall not affect in any way the meaning or  interpretation  of
this Agreement.

      9.7  Incorporated  by Reference.  The Disclosure  Schedules and Subsequent
Disclosure Schedules are incorporated as a part of this Agreement by reference.

      9.8 Number  and Gender of Words.  When the  context  so  requires  in this
Agreement, words of any gender shall include either or both of the other genders
and the singular number shall include the plural.

      9.9  Execution  of  Additional  Documents.  Each party  hereto shall make,
execute,  acknowledge and deliver such other instruments and documents, and take
all such other actions as may be reasonably  required in order to effectuate the
purposes of this  Agreement  and to  consummate  the  transactions  contemplated
hereby.

      9.10 Finders' and Related Fees.  Each of the parties hereto is responsible
for, and shall indemnify the other parties against, any claim by any third party
to a fee,  commission,  bonus or other  remuneration  arising  by  reason of any
services  alleged to have been  rendered to or at the  instance of said party to
this  Agreement  with respect to this  Agreement  or to any of the  transactions
contemplated hereby,  including,  without limitation,  any fee payable by STI to
Wasserstein, Perella & Co.

      9.11  Interpretation.  References to "Sections"  herein are  references to
sections  of  this  Agreement.   The  words  "herein,"  "hereof,"  "hereto"  and
"hereunder" and other words of similar import refer to this Agreement as a whole
and not to any particular Article, Section or other subdivision.

      9.12 No Third  Party  Beneficiary,  Etc.  Except  as  otherwise  expressly
provided for herein, there shall be no third party beneficiary of this Agreement
and this  Agreement  shall not inure to the  benefit of, be  enforceable  by, or
create any right or cause of action in any Person other than the parties  hereto
and their heirs, executors,  administrators,  legal representatives,  successors
and permitted assigns.



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      9.13  Reformation;  Severability.  In case any  provision  hereof shall be
invalid,  illegal or  unenforceable,  such  provision  shall be reformed to best
effectuate  the intent of the parties and permit  enforcement  thereof,  and the
validity,  legality and enforceability of the remaining  provisions shall not in
any way be affected or impaired  thereby.  If such  provision  is not capable of
reformation,  it shall be severed from this Agreement and  enforceability of the
remaining provisions shall not in any way be affected or impaired thereby.

      9.14 Binding  Effect and  Assignment.  This  Agreement  shall inure to the
benefit of, and be binding upon, the parties hereto and their respective  heirs,
executors,  administrators,  legal  representatives and permitted assigns.  This
Agreement,  and  the  rights  and  obligations  created  hereunder,  may  not be
transferred  or assigned by any party without the prior  written  consent of the
other parties.

      9.15 Public  Announcements.  Any public  announcement or similar publicity
with respect to this  Agreement  will be issued,  if at all, at such time and in
such manner as STI determines;  provided,  that OmniAmerica will be given a copy
of such press  release a  reasonable  time in advance  of the  issuance  of such
proposed  press  release.  Unless  consented to by STI in advance or required by
legal  requirements,  prior  to the  Closing,  OmniAmerica,  OmniAmericaSub  and
OmniPartners  shall keep this Agreement  strictly  confidential and may not make
any disclosure of this Agreement to any Person.

      9.16  Confidentiality.  Between the date of this Agreement and for the two
(2) year period following (i) termination of this Agreement  pursuant to Article
VIII or (ii) Closing, STI, the Sub, OmniAmerica, OmniAmericaSub and OmniPartners
will  maintain  in  confidence,  and  will  cause  their  respective  directors,
officers, employees, agents, and advisors (the "Representatives") to maintain in
confidence,  any written, oral,  electronic,  or other information of every kind
(including all analyses,  compilations,  forecasts,  studies or other  documents
prepared by a receiving  party that  contain or in any way reflect  Confidential
Information)  that  has  been  or  may  be  furnished  by  either  party  or its
Representatives  obtained in confidence (the  "Confidential  Information")  from
another party to this Agreement (the "Disclosing  Party"), and will not use, and
will cause their  respective  Representatives  not to use, any such  information
except for the purpose of this Agreement or in connection  with any  Proceedings
between any of the parties, unless (a) such information is already known to such
party  and  such  party  is not  bound  by a duty  of  confidentiality  or  such
information  becomes publicly  available through no fault of such party, (b) the
use of such  information  is  necessary in making any  release,  report,  filing
(including  filings  with the SEC or, if required  by  applicable  law,  release
required  by the NASDAQ  Stock  Market) or  obtaining  any  consent or  approval
required  for  the  consummation  of  the  transactions   contemplated  by  this
Agreement,  or (c) the  furnishing  or use of such  information  is  required by
Proceedings.  Each  party  shall only  reveal  Confidential  Information  of the
Disclosing  Party to the receiving  party's  Representatives  (a) who reasonably
need to have  the  Confidential  Information  for  purposes  of  evaluating  the
potential  Merger  and (b) who  are  aware  of the  confidential  nature  of the
Confidential  Information  and of this Section 9.16.  Each party shall cause its
Representatives  to observe the  restrictions  of this Section 9.16 and shall be
responsible for any Breach of this Section 9.16 by


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its Representatives.  If this Agreement is terminated for any reason, each party
must  promptly  return  to the  Disclosing  Party all  Confidential  Information
obtained  from the  Disclosing  Party  that is by  nature  returnable,  and each
receiving  party will thereafter  continue to comply with its obligations  under
this Section 9.16.

      9.17  No Other Representation.

            (a)  Notwithstanding  anything  to the  contrary  contained  in this
      Agreement,  STI and the Sub  acknowledge  and agree  that  except  for the
      representations  and warranties made by OmniAmerica and  OmniAmericaSub in
      Section  4.1  hereof  and  OmniPartners  in  Section  4.2,  that  none  of
      OmniAmerica,   OmniAmericaSub   or   OmniPartners   has  made  any   other
      representations or warranties of any kind (including any representation or
      warranty  with respect to any  projections,  forecasts or forward  looking
      statements  relating  to  OmniAmerica  and  OmniAmericaSub,  or any  other
      information  that may have been  provided to STI and the Sub in connection
      with the transactions  contemplated hereby and neither STI nor the Sub has
      relied upon any projections, forecasts or other information).

            (b) The  limitations  on STI's  and the  Sub's  claims,  rights  and
      remedies  set forth in this  Agreement  are a material  consideration  for
      OmniAmerica's,  OmniAmericaSub's  and  OmniPartners'  willingness to enter
      into this  Agreement  and the Related  Agreements  and to  consummate  the
      transactions contemplated hereby and thereby.

            (c)  Notwithstanding  anything  to the  contrary  contained  in this
      Agreement,  OmniAmerica,  OmniAmericaSub and OmniPartners  acknowledge and
      agree that except for the  representations  and warranties  made by STI in
      Section 4.3 and the Sub in Section 4.4  hereof,  that  neither STI nor the
      Sub  has  made  any  other  representations  or  warranties  of  any  kind
      (including any representation or warranty with respect to any projections,
      forecasts or forward looking statements relating to STI or the Sub, or any
      other   information   that  may  have  been   provided   to   OmniAmerica,
      OmniAmericaSub  and  OmniPartners  in  connection  with  the  transactions
      contemplated   hereby   and  none  of   OmniAmerica,   OmniAmericaSub   or
      OmniPartners  has  relied  upon  any   projections,   forecasts  or  other
      information).

            (d)  The   limitations  on   OmniAmerica's,   OmniAmericaSub's   and
      OmniPartners'  claims, rights and remedies set forth in this Agreement are
      a material consideration for STI's and the Sub's willingness to enter into
      this   Agreement  and  the  Related   Agreements  and  to  consummate  the
      transactions contemplated hereby and thereby.

            (e)  Whether  or not  the  Closing  shall  occur,  no  incorporator,
      director,  officer, employee of STI, the Sub, OmniAmerica,  OmniAmericaSub
      or  OmniPartners  (in each case solely in their  capacities as such) shall
      have any liability to any Person


                                     76



<PAGE>






      under  the  terms of this  Agreement  or as a result  of the  transactions
      contemplated  hereby,  and no  recourse  of any  kind  shall be had by the
      parties hereto against any such incorporator,  director, officer, employee
      of STI, the Sub, OmniAmerica, OmniAmericaSub or OmniPartners (in each case
      solely  in  their   capacities   as  such)   whether   by  virtue  of  any
      constitutional  provision or statute or rule of law, or by  enforcement of
      any assessment or penalty or in any other manner, all such liability being
      expressly  waived and released by the parties hereto to the fullest extent
      permitted  by law as part  of the  consideration  of  entering  into  this
      Agreement.

      9.18 Time of the  Essence.  With regard to all dates and time  periods set
forth or referred to in this Agreement, time is of the essence.

      9.19 Counterparts. This Agreement may be executed in counterparts, each of
which shall be deemed an original,  but all of which together  shall  constitute
one and the same instrument.

      9.20  Governing Law. This  Agreement and the Related  Agreements  shall be
governed by,  construed,  interpreted and applied in accordance with the laws of
the State of Texas,  without  giving  effect to any  conflict of laws rules that
would refer the matter to the laws of another jurisdiction.

      Each party hereto hereby  irrevocably  submits to the  jurisdiction of the
United  States  District  Court for the Northern  District of Texas and, if such
court does not have jurisdiction,  of the courts of the State of Texas in Dallas
County,  for the purposes of any action  arising out of this Agreement or any of
the Related Agreements,  or the subject matter hereof or thereof, brought by any
other party.

      To the extent  permitted by  applicable  law, each party hereby waives and
agrees not to assert,  by way of motion,  as a defense or  otherwise in any such
action,  any  claim  (i)  that  it is not  subject  to the  jurisdiction  of the
above-named  courts,  (ii) that the action is brought in an inconvenient  forum,
(iii) that it is immune  from any legal  process  with  respect to itself or its
property,  (iv) that the venue of the suit,  action or proceeding is improper or
(v) that this  Agreement or any of the Related  Agreements or the subject matter
hereof or thereof may not be enforced in or by such courts.




                                    * * * * *


                                       77



<PAGE>






      IN WITNESS WHEREOF,  the parties hereto have executed this Agreement as of
the date first written hereinabove.

                                 SPECIALTY TELECONSTRUCTORS, INC.


                                 By:  /s/ Jeffrey A. Howard
                                    -----------------------------
                                    Jeffrey A. Howard
                                    Vice President and Chief Financial Officer


                                 OAI ACQUISITION CORP.


                                 By:   /s/ Jeffrey A. Howard
                                    -----------------------------
                                    Jeffrey A. Howard
                                    Vice President and Chief Financial Officer


                                 OMNIAMERICA HOLDINGS CORPORATION


                                 By:   /s/ Daniel S. Dross
                                    -----------------------------
                                    Daniel S. Dross
                                    Vice President and Secretary


                                 OMNIAMERICA, INC.


                                 By:   /s/ Daniel S. Dross
                                    -----------------------------
                                    Daniel S. Dross
                                    Vice President, Secretary and Treasurer


                                 OMNI/HSW ACQUISITION, INC.


                                 By:   /s/ Daniel S. Dross
                                    -----------------------------
                                    Daniel S. Dross
                                    Vice President, Secretary and Treasurer



                                     78



<PAGE>






                                 HMTF/OMNI PARTNERS, L.P.

                                 By: HM3/OMNIAMERICA PARTNERS, LLC, its
                                     general partner


                                 By:   /s/ Daniel S. Dross
                                    -----------------------------
                                     Daniel S. Dross
                                     Vice President, Secretary and Treasurer



                                     79



<PAGE>






                       EXHIBIT (ix)--HSW Merger Agreement

                         Form of HSW Merger Agreement



                                     80



<PAGE>







                               EXHIBIT (x)--Liens

                   List of Owner Policies of Title Insurance


                              Title Policies

                              Ardman Broadcasting Corporation
                              Beeline
                              TowerCom, Limited (Tampa)
                              H.S.W. Associates, Inc. (pro forma)


                              Title Commitments

                              Radio Seaway, Incorporated
                              Miller Transmission Tower Company Ltd.
                              TowerCom, Limited (Orange & Dade Counties)



                                     81



<PAGE>






                                  EXHIBIT 2.1

                       Directors of STI, OmniAmerica and
                      OmniAmericaSub Following the Merger


                              Lawrence D. Stuart, Jr.
                              Jack D. Furst
                              Carl E. Hirsch
                              One independent  director  appointed by HTMF to be
                              named  within  10  days  after  the  date  of this
                              Agreement

                              Michael R. Budagher
                              Ernie L. Carpenter
                              John D. Emery
                              Jeffrey A. Howard




                                     82



<PAGE>






                                 EXHIBIT 5.2.3

                         Retained Affiliate Contracts



                              Kline Option Agreement
                              Kline Shareholders Agreement
                              Kline Consulting Agreement


                                     83



<PAGE>






                                 EXHIBIT 6.1.7

                 Form of Opinion of Weil, Gotshal & Manges LLP

                    [Weil, Gotshal & Manges LLP letterhead]


                                           , 1998



Specialty Teleconstructors, Inc.
12001 State Highway 14 North
Cedar Crest, New Mexico 87008

Ladies and Gentlemen:

            We have acted as  counsel to  OmniAmerica  Holdings  Corporation,  a
Delaware corporation (the "Company"),  OmniAmerica, Inc., a Delaware corporation
that is a  wholly-owned  subsidiary  of the Company  ("OmniAmerica"),  HMTF/Omni
Partners,  L.P., a Delaware limited  partnership that is the sole stockholder of
the Company ("OmniPartners"), Omni/HSW Acquisition, Inc., a Delaware corporation
and wholly-owned subsidiary of OmniPartners ("Omni/HSW"),  and Hicks, Muse & Co.
Partners, L.P., a Texas limited partnership ("HMC Partners"), in connection with
the preparation,  authorization, execution and delivery of, and the consummation
of the  transactions  contemplated  by, the  Agreement  and Plan of Merger  (the
"Merger  Agreement"),  dated as of February __, 1998,  by and among the Company,
OmniAmerica,   OmniPartners,   Specialty   Teleconstructors,   Inc.,   a  Nevada
corporation ("STI"), and OAI Acquisition Corp., a Delaware corporation that is a
wholly-owned subsidiary of STI ("Acquisition"). Capitalized terms defined in the
Merger  Agreement  and used but not  otherwise  defined  herein  shall  have the
meanings ascribed to such terms in the Merger Agreement.

            In so acting,  we have  examined  originals or copies,  certified or
otherwise identified to our satisfaction,  of the Merger Agreement,  the related
Disclosure Schedule and Subsequent  Disclosure  Schedule,  if any, to the Merger
Agreement,  the Exhibits to the Merger Agreement, and the Related Agreements and
such corporate records,  agreements,  documents and other instruments,  and such
certificates  or  comparable  documents of public  officials and of officers and
representatives  of the  Company,  OmniAmerica,  OmniPartners,  Omni/HSW and HMC
Partners and have made such inquiries of such officers and  representatives,  as
we have deemed  relevant and  necessary as a basis for the opinions  hereinafter
set forth.

            In  such  examination,  we  have  assumed  the  genuineness  of  all
signatures,  the legal  capacity of natural  persons,  the  authenticity  of all
documents submitted to us as originals,  the conformity to original documents of
all documents submitted to us as certified, conformed


                                     84



<PAGE>






or  photostatic  copies and the  authenticity  of the  originals  of such latter
documents.  As to all  questions of fact  material to this opinion that have not
been independently  established,  we have relied upon certificates or comparable
documents  of  officers  and   representatives  of  the  Company,   OmniAmerica,
OmniPartners,  Omni/HSW  and HMC  Partners  and  upon  the  representations  and
warranties of the Company, OmniAmerica,  OmniPartners, Omni/HSW and HMC Partners
contained in the Merger  Agreement.  As used herein,  "to our knowledge" and "of
which we are aware" mean the conscious  awareness of facts or other  information
by any lawyer in our firm actively involved in the transactions  contemplated by
the Merger Agreement.

            Based on the  foregoing,  and subject to the  qualifications  stated
herein, we are of the opinion that:

            1. Each of the Company,  OmniAmerica  and Omni/HSW is a  corporation
duly  incorporated,  validly existing and in good standing under the laws of the
State of Delaware and has all  requisite  corporate  power and authority to own,
lease and  operate  its  properties  and to carry on its  business  as now being
conducted.  OmniPartners  is a limited  partnership  duly  organized and validly
existing  under  the  laws of the  State  of  Delaware  and  has  all  requisite
partnership  power and authority to own, lease and operate its properties and to
carry  on its  business  as now  being  conducted.  HMC  Partners  is a  limited
partnership  duly organized and validly  existing under the laws of the State of
Texas and has all requisite  partnership  power and authority to own,  lease and
operate its properties and to carry on its business as now being conducted.

            2. The  authorized  capital  stock of (i) the  Company  consists  of
80,000,000  shares of common stock,  par value $0.01 per share ("Company  Common
Stock"),  and (ii)  OmniAmerica  consists of 1,000 shares of common  stock,  par
value  $0.01 per  share  ("OmniAmerica  Common  Stock").  As of the date  hereof
(immediately  prior to the consummation of the transactions  contemplated by the
Merger Agreement), there are 74,099,298 shares of Company Common Stock and 1,000
shares  of  OmniAmerica  Common  Stock  issued  and  outstanding.  All  of  such
outstanding shares of Company Common Stock and OmniAmerica Common Stock are duly
authorized,  validly  issued,  fully paid and  nonassessable,  with no  personal
liability  attaching  to the  ownership  thereof,  and have not been  issued  in
violation  of any  preemptive  rights  pursuant  to law or in the  Company's  or
OmniAmerica's  Certificate  of  Incorporation  or Bylaws  or, to our  knowledge,
pursuant to any contract or agreement to which the Company or  OmniAmerica  is a
party or by which either of them is bound.

            3.  Other than as  disclosed  in the Merger  Agreement  and  related
Disclosure  Schedule  and  Subsequent  Disclosure  Schedule,  if any, all of the
outstanding  shares of capital stock of (i)  OmniAmerica  are owned of record by
the Company and (ii) each other  Subsidiary of the Company that is a corporation
are owned of record, directly or indirectly, by the Company.



                                     85



<PAGE>






            4. Each of the Company,  OmniAmerica  and Omni/HSW has all requisite
corporate  power and  authority to execute and deliver the Merger  Agreement and
the Related  Agreements  to which it is a party and to perform  its  obligations
thereunder. The execution,  delivery and performance of the Merger Agreement and
the Related Agreements by each of the Company,  OmniAmerica and Omni/HSW (to the
extent  it is a  party  thereto)  and  the  consummation  by each of them of the
transactions  contemplated  thereby have been duly  authorized  by all necessary
corporate  action on the part of the  Company,  OmniAmerica  and  Omni/HSW.  The
Merger  Agreement and each of the Related  Agreements have been duly and validly
executed and delivered by each of the Company,  OmniAmerica and Omni/HSW (to the
extent it is a party thereto) and (assuming the due authorization, execution and
delivery  thereof by the other parties thereto (other than  OmniPartners and HMC
Partners))  constitutes the legal,  valid and binding  obligation of each of the
Company,  OmniAmerica  and  Omni/HSW,   enforceable  against  each  of  them  in
accordance  with  their  respective  terms,  subject to  applicable  bankruptcy,
insolvency, fraudulent conveyance,  reorganization,  moratorium and similar laws
affecting  creditors'  rights  and  remedies  generally,   and  subject,  as  to
enforceability,  to  general  principles  of  equity,  including  principles  of
commercial  reasonableness,  good faith and fair dealing  (regardless of whether
enforcement  is sought in a proceeding  at law or in equity) and except that (a)
rights to indemnification and contribution  thereunder may be limited by federal
law or state  securities  laws or  public  policy  relating  thereto  and (b) no
opinion is expressed with respect to Section __ of [specify in final opinion any
non-competition covenants contained in any Related Agreement].

            5.  Each  of  OmniPartners   and  HMC  Partners  has  all  requisite
partnership  power and authority to execute and deliver the Merger Agreement and
the Related  Agreements  to which it is a party and to perform  its  obligations
thereunder. The execution,  delivery and performance of the Merger Agreement and
the Related  Agreements by OmniPartners  and HMC Partners (to the extent it is a
party  thereto)  and the  consummation  by  each  of  them  of the  transactions
contemplated  thereby have been duly  authorized  by all  necessary  partnership
action on the part of OmniPartners  and HMC Partners.  The Merger  Agreement and
each of the Related Agreements have been duly and validly executed and delivered
by  OmniPartners  and HMC  Partners  (to the extent it is a party  thereto)  and
(assuming the due  authorization,  execution  and delivery  thereof by the other
parties thereto (other than the Company,  OmniAmerica and Omni/HSW)) constitutes
the legal,  valid and  binding  obligation  of  OmniPartners  and HMC  Partners,
enforceable  against each of them in  accordance  with their  respective  terms,
subject   to   applicable   bankruptcy,   insolvency,   fraudulent   conveyance,
reorganization,  moratorium  and similar laws  affecting  creditors'  rights and
remedies generally, and subject, as to enforceability,  to general principles of
equity, including principles of commercial  reasonableness,  good faith and fair
dealing  (regardless of whether  enforcement is sought in a proceeding at law or
in  equity)  and  except  that (a) rights to  indemnification  and  contribution
thereunder  may be  limited by federal  law or state  securities  laws or public
policy relating  thereto and (b) no opinion is expressed with respect to Section
__ of [specify in final opinion any  non-competition  covenants contained in any
Related Agreement].



                                     86



<PAGE>






            6. The  execution  and  delivery  of the  Merger  Agreement  and the
Related Agreements,  the consummation of the transactions  contemplated  thereby
and  compliance by the Company,  OmniAmerica  and Omni/HSW  with the  provisions
thereof  will not  constitute  a default  under or violate (i) any of the terms,
conditions or provisions of the Certificate of Incorporation or Bylaws of any of
the Company,  OmniAmerica  or Omni/HSW or (ii) except as disclosed in the Merger
Agreement and related Disclosure Schedule and Subsequent Disclosure Schedule, if
any, any Texas or Delaware  corporate or federal law or  regulation  (other than
federal  and  state  securities  or blue sky  laws,  as to which we  express  no
opinion).

            7. The  execution  and  delivery  of the  Merger  Agreement  and the
Related Agreements,  the consummation of the transactions  contemplated  thereby
and compliance by OmniPartners and HMC Partners with the provisions thereof will
not  constitute a default  under or violate (i) any of the terms,  conditions or
provisions of the limited partnership  agreement of OmniPartners or HMC Partners
or (ii) except as  disclosed  in the Merger  Agreement  and  related  Disclosure
Schedule  and  Subsequent  Disclosure  Schedule,  if any,  any Texas or Delaware
limited  partnership or federal law or regulation  (other than federal and state
securities or blue sky laws, as to which we express no opinion).

            8. No consent,  approval,  waiver, license or authorization or other
action by or filing with any Texas,  Delaware corporate or federal  governmental
authority  is required in  connection  with the  execution  and  delivery by the
Company,  OmniAmerica  or  Omni/HSW  of the  Merger  Agreement  or  the  Related
Agreements or the  consummation  by the Company,  OmniAmerica or Omni/HSW of the
transactions  contemplated thereby,  except for (i) federal and state securities
or blue sky laws,  as to which we  express  no  opinion,  (ii) the filing of the
certificate of merger contemplated by Section 1.3 of the Merger Agreement, (iii)
those the failure of which to obtain would not  reasonably be expected to have a
Material Adverse Effect and (iv) those already obtained.

            9. No consent,  approval,  waiver, license or authorization or other
action by or filing  with any Texas,  Delaware  limited  partnership  or federal
governmental authority is required in connection with the execution and delivery
by OmniPartners or HMC Partners of the Merger  Agreement or the  consummation by
OmniPartners or HMC Partners of the transactions  contemplated  thereby,  except
for (i) federal and state securities or blue sky laws, as to which we express no
opinion,  (ii) the filing of the  certificate of merger  contemplated by Section
1.3 of the Merger  Agreement,  (iii) those the failure of which to obtain  would
not  reasonably  be  expected to have a Material  Adverse  Effect and (iv) those
already obtained.

            The opinions  expressed  herein are limited to the laws of the State
of Texas,  the corporate and limited  partnership  laws of the State of Delaware
and the federal laws of the United  States,  and we express no opinion as to the
effect  on the  matters  covered  by  this  letter  of  the  laws  of any  other
jurisdiction.

            The opinions  expressed  herein are rendered solely for your benefit
in connection with the transactions  described herein. Those opinions may not be
used or relied upon by any


                                     87



<PAGE>






other person,  nor may this letter or any copies thereof be furnished to a third
party, filed with a governmental agency,  quoted, cited or otherwise referred to
without our prior written consent.

                                          Very truly yours,








                                     88



<PAGE>






                               EXHIBIT 6.2.7(a)

                    Form of Opinion of Haynes & Boone, LLP


      1. Sub is a corporation  duly  incorporated,  validly existing and in good
standing under the laws of the State of Delaware and has all requisite corporate
power and authority to own, lease and operate its properties and to carry on its
business as now being conducted.

      2. Sub has the requisite  corporate power to execute,  deliver and perform
its obligations  under the Merger Agreement and the Related  Agreements to which
it is a party.  The  execution  and  delivery  of the Merger  Agreement  and the
Related Agreements by Sub and the performance of its obligations thereunder have
been duly authorized by all necessary  corporate  action on its part. The Merger
Agreement and the Related  Agreements to which STI and Sub are a party have been
duly  executed  and  delivered  by each of STI and Sub,  and  (assuming  the due
authorization,  execution  and  delivery  thereof by the other  parties  thereto
(other than STI and Sub)) each constitutes a legal, valid and binding obligation
of STI or  Sub,  as the  case  may  be,  enforceable  against  each  of  them in
accordance  with  their  terms,  except  as  enforceability  may be  limited  by
applicable bankruptcy,  insolvency,  fraudulent conveyance, fraudulent transfer,
reorganization  or similar laws  affecting the rights of creditors  from time to
time in effect and general principles of equity regardless of whether brought in
an action at law or in equity (it being understood such counsel need not express
any opinion as to the availability of equitable  remedies) or the enforceability
of any  provisions  of the  Merger  Agreement  insofar as they may be limited by
considerations of public policy.

      3.  Except  for (i)  filings  under the HSR Act,  (ii) as set forth on the
Disclosure  Schedule  to  the  Merger  Agreement  or any  Subsequent  Disclosure
Schedule,  (iii) as  contemplated  by the  Merger  Agreement  or (iv)  those the
failure of which to obtain would not  reasonably  be expected to have a Material
Adverse  Effect,  no consent,  approval  or  authorization  of, or  designation,
declaration  or filing with, any Federal,  State of Texas or Delaware  corporate
governmental  authority  is  required  on the  part of STI or Sub for the  valid
execution or delivery of the Merger  Agreement,  the Related  Agreements  or the
performance of their respective obligations thereunder.

      4. The execution  and delivery by STI and Sub of the Merger  Agreement and
the Related  Agreements,  to which each is a party,  the consummation by STI and
Sub of the transactions  contemplated thereby and compliance by STI and Sub with
the provisions thereof will not constitute a default under or violate (i) any of
the terms,  conditions or  provisions of the  Certificate  of  Incorporation  or
Bylaws of Sub or (ii) except as disclosed in the Merger


                                     89



<PAGE>






Agreement and related Disclosure Schedule or any Subsequent Disclosure Schedule,
any statute,  rule or regulation of the federal government of the United States,
the State of Texas or the DGCL applicable to STI or Sub.

      5. The  authorized  capital stock of the Sub is as set forth in the Merger
Agreement.  All of the  issued  and  outstanding  shares of the Sub are owned of
record by STI.





































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

*    All opinions are subject to normal and customary exceptions and assumptions
     and qualifications.




                                     90



<PAGE>






                                EXHIBIT 6.2.7(b)

                        Form of Opinion of Jones, Vargas


      1. STI is a corporation  duly  incorporated,  validly existing and in good
standing  under the laws of the State of Nevada and has all requisite  corporate
power and authority to own, lease and operate its properties and to carry on its
business as now being conducted.

      2. STI has the requisite  corporate power to execute,  deliver and perform
its obligations  under the Merger Agreement and the Related  Agreements to which
it is a party.  The  execution  and  delivery  of the Merger  Agreement  and the
Related Agreements by STI and the performance of its obligations thereunder have
been duly authorized by all necessary corporate action on its part.

      3.  Except  (i) as set  forth on the  Disclosure  Schedule  to the  Merger
Agreement or any Subsequent  Disclosure  Schedule,  (ii) as  contemplated by the
Merger  Agreement  or (iii)  those  the  failure  of which to  obtain  would not
reasonably be expected to have a Material Adverse Effect,  no consent,  approval
or  authorization  of, or designation,  declaration or filing with, any State of
Nevada  governmental  authority  is  required  on the part of STI for the  valid
execution or delivery of the Merger  Agreement,  the Related  Agreements  or the
performance of its obligations thereunder.

      4. The  execution  and  delivery  by STI of the Merger  Agreement  and the
Related  Agreements,  to  which it is a party,  the  consummation  by STI of the
transactions  contemplated  thereby and  compliance  by STI with the  provisions
thereof  will not  constitute  a default  under or violate (i) any of the terms,
conditions or provisions of the Certificate of Incorporation or Bylaws of STI or
(ii) except as disclosed in the Merger Agreement and related Disclosure Schedule
or any Subsequent  Disclosure Schedule,  any statute,  rule or regulation of the
State of Nevada applicable to STI.

      5.  The  authorized  capital  stock of STI is as set  forth in the  Merger
Agreement.

      6. The Merger  Consideration  has been duly  authorized  for issuance and,
when issued in accordance with the terms and conditions of the Merger Agreement,
the Merger  Consideration  will be validly issued,  fully paid and nonassessable
and free of preemptive  rights pursuant to the laws of the State of Nevada or in
STI's Articles of Incorporation or Bylaws.


- ------------------------
*    All opinions are subject to normal and customary exceptions and assumptions
     and qualifications.


                                     91



<PAGE>






                                EXHIBIT 6.2.10(a)

                               Form of Tax Opinion



                                           , 1998



OmniAmerica, Inc.
11111 Santa Monica Blvd.
Los Angeles, California 90025
Attention:  Carl E. Hirsch

Ladies & Gentlemen:

            You have requested our opinion  regarding certain federal income tax
consequences of the merger (the "Merger") of OAI Acquisition  Corp.  ("Sub"),  a
Delaware   corporation   and  the   wholly   owned   subsidiary   of   Specialty
Teleconstructors,   Inc.  ("Parent"),  a  Nevada  corporation,   with  and  into
OmniAmerica Holdings Corporation (the "Company"), a Delaware corporation.

            In formulating our opinion,  we examined such documents as we deemed
appropriate,  including the  Agreement and Plan of Merger among Parent,  Sub and
the Company  dated as of , 1998 (the "Merger  Agreement")  In addition,  we have
obtained such  additional  information as we have deemed  relevant and necessary
through consultation with various officers and representatives of Parent and the
Company.

            Our  opinion  set  forth  below  assumes  (1)  the  accuracy  of the
statements and facts  concerning  the Merger set forth in the Merger  Agreement,
(2) the  consummation  of the  Merger  in the  manner  contemplated  by,  and in
accordance  with the  terms  set  forth in,  the  Merger  Agreement  and (3) the
accuracy of (i) the representations  made by Parent,  which are set forth in the
Officers' Certificate delivered to us by Parent, dated the date hereof, (ii) the
representations  made by the  Company,  which  are set  forth  in the  Officers'
Certificate delivered to us by the Company, dated the date hereof, and (iii) the
representations  made by  HMTF/Omni  Partners,  LP  ("HMFT")  set  forth  in the
Certificate delivered to us by HMTF, dated the date hereof.

            Based upon the facts and statements set forth above, our examination
and review of the documents referred to above and subject to the assumptions set
forth above, we are of the opinion that for federal income tax purposes:



                                     92



<PAGE>






            1. The Merger will constitute a reorganization within the meaning of
Section 368(a)(1) of the Internal Revenue Code of 1986, as amended (the "Code").

            2. No gain or loss will be  recognized  by the  shareholders  of the
Company upon their  exchange of common stock of the Company  ("Company  Common")
for common stock of Parent ("Parent  Common"),  except for cash received in lieu
of a fractional share interest in Parent Common.

      We express no opinion  concerning any tax consequences of the Merger other
than those specifically set forth herein.

            Our opinion is based on current provisions of the Code, the Treasury
Regulations  promulgated  thereunder,  published  pronouncements of the Internal
Revenue  Service  and case  law,  any of which may be  changed  at any time with
retroactive  effect.  Any change in applicable  laws or facts and  circumstances
surrounding the Merger, or any inaccuracy in the statements,  facts, assumptions
and  representations on which we have relied, may affect the continuing validity
of the opinions set forth herein.  We assume no  responsibility to inform you of
any such change or inaccuracy that may occur or come to our attention.


                                          Very truly yours,






                                     93



<PAGE>






                                EXHIBIT 6.2.10(b)

                         Form of OmniAmerica Certificate



                                            , 1998



Weil, Gotshal & Manges LLP
100 Crescent Court
Suite 1300
Dallas, Texas  75201

Dear Sirs:

            In connection  with your opinion  concerning  certain federal income
tax consequences of the merger (the "Merger") of OAI Acquisition  Corp.  ("Sub")
with  and  into  OmniAmerica  Holdings  Corporation  (the  "Company"),  you have
requested certain representations,  warranties and undertakings from the Company
as of the date of this letter (the "Closing Date") and thereafter. We understand
that you are relying upon this letter in rendering your opinion.

            Whenever used herein,  (i) the term "Parent" shall mean the owner of
all of the issued and outstanding  stock of Sub; (ii) the term "Company  Common"
shall mean the issued and  outstanding  shares of common  stock of the  Company;
(iii) the term "Parent Common" shall mean the issued and  outstanding  shares of
Parent common stock;  (iv) the term "Merger  Agreement" shall mean the Agreement
and Plan of Merger dated as of , 1998 among Parent, Sub and the Company; and (v)
the term "Code" shall mean the Internal Revenue Code of 1986, as amended.

            The Company hereby represents, warrants, and undertakes as follows:

            1. The fair market value of the Parent Common to be received by each
      holder of Company  Common will be  approximately  equal to the fair market
      value of the Company Common surrendered in exchange therefor.

            2.  Within  the two year  period  ending  on the  Closing  Date,  no
      outstanding  stock of the  Company has been (i)  redeemed by the  Company,
      (ii)  acquired by a person  related to the Company  (within the meaning of
      Treasury  Regulations  Section 1.368- 1(e)(3) determined without regard to
      Treasury Regulation Section  1.368-1(e)(3)(i)(A))  for consideration other
      than  Company  Common  or  Parent  Common,  or (iii)  the  subject  of any
      distribution by the Company.


                                     94



<PAGE>







            3. The Company is not aware of any plan,  intention,  obligation  or
      commitment on the part of any shareholder of the Company to sell, exchange
      or otherwise  dispose of the Parent Common to be received in the Merger by
      such holder of Company  Common  directly or  indirectly  to Parent or to a
      person  related to Parent  (within  the  meaning of  Treasury  Regulations
      Section 1.368-1(e)(3)) for consideration other than Parent Common.

            4.  Following the Merger,  the Company will hold at least 90 percent
      of the fair market  value of its net assets and at least 70 percent of the
      fair  market  value of its  gross  assets  held  immediately  prior to the
      Merger. For purposes of this  representation,  amounts paid by the Company
      to  dissenters,  amounts paid by the Company to  shareholders  who receive
      cash or other property,  amounts used by the Company to pay reorganization
      expenses,  and all  redemptions  and  distributions  (except for  regular,
      normal  dividends)  made by the Company  within the preceding  three years
      will be included as assets of the Company immediately prior to the Merger.

            5. The Company has no plan or intention to issue  additional  shares
      of its stock that would  result in Parent  losing  control of the  Company
      within the meaning of Section 368(c) of the Code.

            6. As of the Closing  Date,  the Company has  continued  to actively
      conduct the same trade or business it has conducted since .

           [7. In  accordance with the Merger  Agreement,  the  Company  and the
      shareholders of the Company will pay their  respective  expenses,  if any,
      incurred in connection with the Merger.]

            8. There is no  intercorporate  indebtedness  existing  between  the
      Company  and  Parent  or  between  the  Company  and Sub that was  issued,
      acquired, or will be settled at a discount.

            9. In the Merger,  shares of Company Common representing  control of
      the Company,  as defined in Section 368(c) of the Code,  will be exchanged
      solely for voting stock of Parent.  For  purposes of this  representation,
      shares of Company Common exchanged for cash or other property  originating
      with Parent will be treated as  outstanding  Company Common on the date of
      the Merger.

            10. At the time of the Merger, the Company will not have outstanding
      any warrants, options,  convertible securities, or any other type of right
      pursuant to which any person could  acquire  stock in the Company that, if
      exercised or converted,  would affect Parent's acquisition or retention of
      control of the Company, as defined in Section 368(c) of the Code.



                                     95



<PAGE>






            11. The Company is not an investment  company, as defined in Section
      368(a)(2)(F)(iii) and (iv) of the Code.

            12. On the date of the Merger,  the fair market  value of the assets
      of the Company will exceed the sum of its liabilities,  plus the amount of
      liabilities, if any, to which the assets of the Company are subject.

            13. The Company is not under the  jurisdiction of a court in a title
      11 or similar case within the meaning of Section 368(a)(3)(A) of the Code.

            14.  The  payment  of cash in lieu of  fractional  shares  of Parent
      Common in the Merger is solely for the purpose of avoiding the expense and
      inconvenience  to  Parent  of  issuing  fractional  shares  and  does  not
      represent   separately   bargained-for   consideration.   The  total  cash
      consideration  that will be paid in the  Merger to the  holders of Company
      Common  instead of issuing  fractional  shares of Parent  Common  will not
      exceed one percent of the total  consideration  to be issued in the Merger
      to the  holders of Parent  Common in exchange  for their  shares of Parent
      Common.

            15.   The business reasons for the Merger are                 .

            16.  There  are  no  agreements,   understandings,  or  arrangements
      affecting any of the factual matters relevant to the Merger other than the
      Merger Agreement.

            17. None of the compensation to be received by any holder of Company
      Common who is an employee of the  Company  will be separate  consideration
      for, or  allocable  to, any of their  Company  Common.  None of the Parent
      Common to be  received  by any holder of Company  Common  will be separate
      consideration for, or allocable to, any employment agreement.

            18.  There are no  dividends  in arrears with respect to the Company
Common.

                                    Very truly yours,

                                    OMNIAMERICA HOLDINGS CORPORATION



                                    By:
                                    Its:



                                     96



<PAGE>






                                EXHIBIT 6.2.10(c)

                        Form of OmniPartners Certificate



                                            , 1998



Weil, Gotshal & Manges LLP
100 Crescent Court
Suite 1300
Dallas, Texas  75201

Dear Sirs:

            In connection  with your opinion  concerning  certain federal income
tax consequences of the merger (the "Merger") of OAI Acquisition  Corp.  ("Sub")
with  and  into  OmniAmerica  Holdings  Corporation  (the  "Company"),  you have
requested  certain  representations,  warranties and undertakings from HMTF/Omni
Partners,  LP (the  "Stockholder")  as of the date of this letter (the  "Closing
Date") and  thereafter.  We understand  that you are relying upon this letter in
rendering your opinion.

            Whenever used herein,  (i) the term "Parent" shall mean the owner of
all of the issued and outstanding  stock of Sub; (ii) the term "Company  Common"
shall mean the issued and outstanding shares of common stock of the Company; and
(iii) the term "Parent Common" shall mean the issued and  outstanding  shares of
Parent common stock.

            The  Stockholder  hereby  represents,  warrants,  and  undertakes as
follows:

            1.  Within  the two year  period  ending  on the  Closing  Date,  no
      outstanding  stock of the  Company has been (i)  redeemed by the  Company,
      (ii)  acquired by a person  related to the Company  (within the meaning of
      Treasury  Regulations  Section 1.368- 1(e)(3) determined without regard to
      Treasury Regulation Section  1.368-1(e)(3)(i)(A))  for consideration other
      than  Company  Common  or  Parent  Common,  or (iii)  the  subject  of any
      distribution by the Company.




                                     97



<PAGE>






            2. The Stockholder has no plan, intention,  obligation or commitment
      to sell, exchange or otherwise dispose of the Parent Common to be received
      in the Merger by such holder of Company  Common  directly or indirectly to
      Parent or to a person  related to Parent  (within  the meaning of Treasury
      Regulations  Section  1.368-1(e)(3))  for consideration  other than Parent
      Common.


                                    Very truly yours,

                                    HMTF/OMNI PARTNERS, LP

                                    By:
                                    Its:




                                     98



<PAGE>






                                EXHIBIT 6.2.10(d)

                             Form of STI Certificate



                                           , 1998



Weil, Gotshal & Manges LLP
100 Crescent Court
Suite 1300
Dallas, Texas  75201

Dear Sirs:

            In connection  with your opinion  concerning  certain federal income
tax consequences of the merger (the "Merger") of OAI Acquisition  Corp.  ("Sub")
with  and  into  OmniAmerica  Holdings  Corporation  (the  "Company"),  you have
requested certain  representations,  warranties and undertakings from Parent (as
hereinafter  defined)  as of the date of this letter  (the  "Closing  Date") and
thereafter.  We  understand  that you are relying  upon this letter in rendering
your opinion.

            Whenever used herein,  (i) the term "Parent" shall mean the owner of
all of the issued and outstanding  stock of Sub; (ii) the term "Company  Common"
shall mean the issued and  outstanding  shares of common  stock of the  Company;
(iii) the term "Parent Common" shall mean the issued and  outstanding  shares of
Parent common stock;  (iv) the term "Merger  Agreement" shall mean the Agreement
and Plan of Merger dated as of , 1998 among Parent, Sub and the Company; and (v)
the term "Code" shall mean the Internal Revenue Code of 1986, as amended.

            Parent hereby represents, warrants, and undertakes as follows:

            1. The fair market value of the Parent Common to be received by each
      holder of Company  Common will be  approximately  equal to the fair market
      value of the Company Common surrendered in exchange therefor.

            2. Parent has no plan,  intention,  obligation or commitment  and no
      person  related to Parent  (within  the  meaning of  Treasury  Regulations
      Section  1.368-1(e)(3)) has any plan, intention,  obligation or commitment
      to  purchase,   exchange,   redeem  or  otherwise   acquire  (directly  or
      indirectly)  any Parent  Common to be received in the Merger by any holder
      of Company  Common in  exchange  for any  consideration  other than Parent
      Common.


                                     99



<PAGE>







            3.  Following  the Merger,  Sub will hold at least 90 percent of the
      fair  market  value of its net  assets and at least 70 percent of the fair
      market  value of its gross  assets held  immediately  prior to the Merger.
      Parent anticipates that following the Merger, the Company, as the survivor
      in the  Merger,  will hold all of the assets of the  Company  and Sub held
      immediately prior to the Merger.

            4. Sub was  incorporated  at the  direction  of Parent  for the sole
      purpose of entering  into the Merger  Agreement  and effecting the Merger.
      From the date of incorporation of Sub and at all times thereafter,  Parent
      has owned and will own all of the issued and outstanding stock of Sub.

            5.  Parent has no plan or  intention  to cause the  Company to issue
      additional  shares of its stock that would result in Parent losing control
      of the Company within the meaning of Section 368(c) of the Code.

            6. Parent has no plan or  intention to  liquidate  the  Company;  to
      merge the Company with or into another  corporation;  to sell or otherwise
      dispose  of the stock of the  Company  except  for  transfers  of stock to
      corporations controlled by Parent (within the meaning of Section 368(c) of
      the Code); or to cause the Company to sell or otherwise  dispose of any of
      its assets or any of the assets acquired from Sub, except for dispositions
      made in the  ordinary  course  of  business  or  transfers  of assets to a
      corporation  controlled  by the  Company  (within  the  meaning of Section
      368(c) of the Code).

            7. Sub will have no liabilities assumed by the Company, and will not
      transfer to the Company any assets subject to liabilities, in the Merger.

            8. Following the Merger,  Parent and members of its qualified  group
      (within the meaning of Treasury Regulation Section 1.368-1(d)(4)(ii)) will
      continue  the  historic  business  of the  Company  and use a  significant
      portion of the Company's historic business assets in a business.

           [9. As required  under the Merger  Agreement, Parent and Sub will pay
      their  respective  expenses,  if  any,  incurred  in  connection with  the
      Merger.]

            10. There is no  intercorporate  indebtedness  existing  between the
      Company  and  Parent  or  between  the  Company  and Sub that was  issued,
      acquired, or will be settled at a discount.

            11.  Parent  does not own and has not  owned  during  the past  five
      years, any shares of the stock of the Company.  No related party to Parent
      (within the meaning of Treasury  Regulations  Section  1.368-1(e)(3)) owns
      (or has owned  within  the past  five  years)  any  shares of stock of the
      Company.



                                     100



<PAGE>






            12. Neither Parent nor Sub is an investment  company,  as defined in
      Section 368(a)(2)(F)(iii) and (iv) of the Code.

            13.  The  payment  of cash in lieu of  fractional  shares  of Parent
      Common in the Merger is solely for the purpose of avoiding the expense and
      inconvenience  to  Parent  of  issuing  fractional  shares  and  does  not
      represent   separately   bargained-for   consideration.   The  total  cash
      consideration  that will be paid in the  Merger to the  holders of Company
      Common  instead of issuing  fractional  shares of Parent  Common  will not
      exceed one percent of the total  consideration  to be issued in the Merger
      to the  holders of Parent  Common in exchange  for their  shares of Parent
      Common.

            14.   The business reasons for the Merger are            .

            15.  There  are  no  agreements,   understandings,  or  arrangements
      affecting any of the factual matters relevant to the Merger other than the
      Merger Agreement.

            16. None of the compensation to be received by any holder of Company
      Common who is an employee of the  Company  will be separate  consideration
      for, or  allocable  to, any of their  Company  Common.  None of the Parent
      Common to be  received  by any holder of Company  Common  will be separate
      consideration for, or allocable to, any employment agreement.


                                    Very truly yours,

                                    SPECIALTY TELECONSTRUCTORS, INC.



                                    By:
                                    Its:




                                     101



<PAGE>






                                 EXHIBIT 7.3(a)

                   Form of Post-Merger Stockholders Agreement



                                     102



<PAGE>






                                 EXHIBIT 7.3(b)

                   Form of Monitoring and Oversight Agreement





                                     103



<PAGE>





                                 EXHIBIT 7.3(c)

                      Form of Financial Advisory Agreement






                                     104



                                                                   Exhibit 99(b)

                      POST-MERGER STOCKHOLDERS AGREEMENT


            THIS   POST-MERGER   STOCKHOLDERS   AGREEMENT  (this   "Stockholders
Agreement"),  dated as of April 23, 1998,  is made and entered into by and among
Specialty Teleconstructors,  Inc., a Nevada corporation (the "Company"), and the
securityholders listed on the signature pages hereof.

            In  consideration  of the premises,  mutual covenants and agreements
hereinafter contained and for other good and valuable consideration, the receipt
and  adequacy  of which are hereby  acknowledged,  the parties  hereto  agree as
follows:


                                   ARTICLE 1

                                  DEFINITIONS

SECTION 1.1  Definitions.

      "Accredited  Investor"  means an  "Accredited  Investor,"  as  defined  in
Regulation D, or any successor rule then in effect.

      "Advice" shall have the meaning provided in Section 3.5.

      "Affiliate" means, with respect to any Person, any Person who, directly or
indirectly,  controls,  is  controlled  by or is under common  control with that
Person. For the purposes of this definition, "control" when used with respect to
any Person means the power to direct the management and policies of such Person,
directly or indirectly,  whether through the ownership of Voting Securities,  by
contract  or  otherwise;  and the  terms  "controlling"  and  "controlled"  have
meanings correlative to the foregoing.

      "Bankruptcy Code" means the United States Bankruptcy Code
(Title XI, USC).

      "Beneficial Ownership" with respect to any securities or assets shall mean
having  "beneficial  ownership" (as determined  pursuant to Rule 13d-3 under the
Exchange   Act),   including   pursuant  to  any   agreement,   arrangement   or
understanding,  whether or not in writing.  Without duplicative  counting of the
same securities by the same holder,  securities  Beneficially  Owned by a Person
shall  include  securities  Beneficially  Owned  by all  other  Persons  who are
Affiliates of such Person (excluding officers and directors of the Company,  the
Company and their controlled



                                     1



<PAGE>









Affiliates) who together with such Person would  constitute a "group" within the
meaning of Section 13(d)(3) of the Exchange Act and in any event with respect to
Budagher shall include  securities held of record by the Budagher Family Limited
Partnership #1.

      "Budagher" means Michael R. Budagher.

      "Business Day" means a day other than a Saturday, a Sunday or other day on
which  commercial  banks  located in New York are  authorized or obligated to be
closed.

      "Carpenter" means Tommie R. Carpenter.

      "Carpenter Priority Shares" shall have the meaning provided
in Section 3.1.4(b).

      "Closing"  shall mean the date on which the  transactions  contemplated by
the Merger Agreement are consummated.

      "Common  Stock"  means  shares of the Common  Stock,  par value  $0.01 per
share,  of the  Company,  and any  capital  stock into which such  Common  Stock
thereafter  may  be  converted  or  otherwise  changed,   including   successive
conversions and changes.

      "Common  Stock  Equivalents"  means,  without  duplication  with any other
Common  Stock or  Common  Stock  Equivalents,  any  rights,  warrants,  options,
convertible securities or indebtedness, exchangeable securities or indebtedness,
or other rights,  exercisable for or convertible or exchangeable into,  directly
or indirectly,  Common Stock of the Company,  whether at the time of issuance or
upon the passage of time or the occurrence of some future event.

      "Company" shall have the meaning  provided in the  introductory  paragraph
hereof and shall include the Company's  successors by merger,  consolidation  or
share exchange.

      "Company Sale" shall have the meaning provided in Section 4.6.

      "Co-Seller" shall have the meaning provided in Section 4.2.1.

      "Demand Registration" shall have the meaning provided in Section 3.1.1(a).

      "Demand Request" shall have the meaning provided in Section 3.1.1(a).



                                     2



<PAGE>










      "Designees" shall have the meaning provided in Section 2.1.1(a).

      "Election Period" shall have the meaning provided in Section 4.1.1(a).

      "Exchange Act" means the Securities Exchange Act of 1934, as amended,  and
the rules and regulations promulgated by the SEC thereunder.

      "Excluded  Registration"  means a registration under the Securities Act of
(i)  securities  registered on Form S-8 or any similar  successor  form and (ii)
securities  registered to effect the acquisition of or combination  with another
Person.

      "Existing Stockholders" means, collectively, Budagher (individually and as
general  partner of the  Budagher  Family,  LLC),  the Budagher  Family,  LLC, a
limited liability  company organized under the laws of the State of Nevada,  and
Carpenter. For purposes of this Stockholders Agreement, Budagher shall be deemed
to own personally all of the shares of Common Stock and Common Stock Equivalents
held by the Budagher Family, LLC.

      "Existing Stockholders Designee" shall have the meaning
provided in Section 2.1.1(a).

      "Family  Member" means, as to any natural  Person,  such Person's  spouse,
grandparent or descendant of that  grandparent,  children (natural and adopted),
natural   or   adopted   siblings,   mothers   and   fathers-in-law,   sons  and
daughters-in-law, and brothers and sisters-in-law.

      "Fully-Diluted  Common Stock"  means,  at any time,  the then  outstanding
Common  Stock of the Company  plus  (without  duplication)  all shares of Common
Stock  issuable,  whether  at  such  time  or upon  the  passage  of time or the
occurrence of future events and without  regard to the amount of any  conversion
or  exercise  price,  upon  the  exercise,   conversion,   or  exchange  of  all
then-outstanding Common Stock Equivalents.

      "Group" shall have the meaning given such term in Section  13(d)(3) of the
Exchange Act.

      "HMC  Group"  means  HMTF/Omni  and  its  Affiliates  and  its  and  their
respective officers,  directors,  and employees (and members of their respective
families  and trusts for the  primary  benefit of such family  members)  and any
Person identified as a member of the HMC Group on the signature pages hereof.




                                     3



<PAGE>









      "HMTF" means Hicks, Muse, Tate & Furst Incorporated, a Texas corporation.

      "HMTF Designee" shall have the meaning provided in Section 2.1.1(a).

      "HMTF Group" shall have the meaning provided in Section 8.1.

      "HMTF/Omni"   means   HMTF/Omni   Partners,  L.P.,  a   Delaware   limited
partnership.

      "Holder" means (i) a  securityholder  listed on the signature pages hereof
and (ii) any direct or indirect  transferee of any such securityholder who shall
become a party to this Stockholders Agreement.

      "Independent  Director"  means a Person who is not (i) a member of the HMC
Group,  (ii) an Existing  Stockholder or (iii) an employee of the Company or any
of its Subsidiaries or a Family Member of any such employee.

      "Inspectors" shall have the meaning provided in Section 3.4.11.

      "Investment Banker" shall have the meaning provided in Section 4.6.

      "Material  Adverse  Effect"  shall  have  the meaning provided  in Section
3.1.4(a).

      "Merger  Agreement" shall mean the Amended and Restated Agreement and Plan
of Merger, dated as of April 22, 1998, among the Company, OAI Acquisition Corp.,
a Delaware corporation and wholly-owned subsidiary of the Company,  OmniAmerica,
OmniAmerica,  Inc.,  a  Delaware  corporation  and  wholly-owned  subsidiary  of
OmniAmerica, HMTF/Omni and Omni/HSW Acquisition, Inc., a Delaware corporation.

      "NASD" means National Association of Securities Dealers, Inc.

      "NASDAQ" shall have the meaning provided in Section 3.4.13.

      "OmniAmerica"   means   OmniAmerica   Holdings   Corporation,  a  Delaware
corporation.

      "Participation Offer" shall have the meaning provided in Section 4.2.1.




                                     4



<PAGE>









      "Person" or "person" means any individual, corporation, partnership, joint
venture, association, joint-stock company, trust, unincorporated organization or
government or other agency or political subdivision thereof.

      "Preferred  Stock"  means  shares  of stock of the  Company  which  have a
preference as to dividends or  distribution  upon  liquidation or dissolution of
the Company,  and any capital stock into which such preferred  stock  thereafter
may be changed.

      "Prohibited Actions" shall have the meaning provided in Section 8.2.2.

      "Records" shall have the meaning provided in Section 3.4.11.

      "Registrable  Shares"  means at any time the Common  Stock of the  Company
owned by the Holders,  whether  owned on the date hereof or acquired  hereafter;
provided,  however, that Registrable Shares shall not include any shares (i) the
sale of which  has been  registered  pursuant  to the  Securities  Act and which
shares have been sold pursuant to such  registration,  (ii) which have been sold
to the public  pursuant to Rule 144 or 144A of the SEC under the  Securities Act
or (iii)  which are  eligible  for sale under  Rule  144(k) of the SEC under the
Securities Act.

      "Registration Expenses" shall have the meaning provided in Section 3.6.

      "Regulation D" means Regulation D promulgated  under the Securities Act by
the SEC.

      "Requesting Holders" shall have the meaning provided in Section 3.1.5.

      "Required  Filing  Date"  shall  have  the  meaning  provided  in  Section
3.1.1(b).

      "Required  Holders"  means  Holders  who then own  beneficially  more than
66-2/3%  of the  aggregate  number of shares of  Common  Stock  subject  to this
Stockholders Agreement.

      "SEC" means the  Securities  and Exchange  Commission as from time to time
constituted  and created  under the  Exchange  Act, or, if at any time after the
execution of this  instrument  such  Securities  and Exchange  Commission is not
existing and  performing  the duties now assigned to it under the Exchange  Act,
then the Person performing such duties at such time.

      "Securities" means the Common Stock.



                                     5



<PAGE>










      "Securities  Act" means the  Securities  Act of 1933, as amended,  and the
rules and regulations promulgated by the SEC thereunder.

      "Seller Affiliates" shall have the meaning provided in Section 3.7.1.

      "Stockholders Agreement" means this Post-Merger Stockholders Agreement, as
the same may be amended from time to time.

      "Subsidiary"  of any Person  means (i) a  corporation  a majority of whose
outstanding shares of capital stock or other equity interests with voting power,
under ordinary  circumstances,  to elect directors,  is at the time, directly or
indirectly,  owned by such Person, by one or more subsidiaries of such Person or
by such Person and one or more  subsidiaries of such Person,  and (ii) any other
Person  (other than a  corporation)  in which such Person,  a subsidiary of such
Person or such Person and one or more  subsidiaries of such Person,  directly or
indirectly,  at the date of determination  thereof,  has (x) at least a majority
ownership  interest  or (y) the  power to  elect or  direct  the  election  of a
majority of the directors or other governing body of such Person.

      "Suspension Event" shall have the meaning provided in Section 3.5.

      "Suspension Notice" shall have the meaning provided in Section 3.5.

      "Tag Seller Group" shall have the meaning provided in Section 4.2.1.

      "Third Party Offer" shall have the meaning provided in Section 8.2.5.

      "Total Voting Power" shall have the meaning provided in Section 8.2.3.

      "Transfer"  means any disposition of any Security or any interest  therein
that would constitute a "sale" thereof within the meaning of the Securities Act.

      "Transfer Notice" shall have the meaning provided in Section 5.3.

      "Transferor" shall have the meaning provided in Section 4.1.1(a).




                                     6



<PAGE>









      "Transferor Shares" shall have the meaning provided in Section 4.1.2.

      "Voting  Securities"  means Common Stock,  Common Stock  Equivalents,  and
securities of the Company generally  conveying the right to vote with holders of
Common Stock in the election of directors or any securities  convertible into or
exchangeable or exercisable for any such  securities,  or warrants,  contractual
rights or other rights of any kind to acquire any such securities.

SECTION 1.2  Rules of Construction.

      Unless the context otherwise requires

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

                    (2) "or" is not exclusive;

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

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

                    (5)  "herein,"  "hereof"  and other words of similar  import
               refer to this  Stockholders  Agreement  as a whole and not to any
               particular Article, Section or other subdivision. ARTICLE 2

               MANAGEMENT OF THE COMPANY AND CERTAIN ACTIVITIES

SECTION 2.1   Board of Directors.

      2.1.1   Board Representation.

      (a) At all times during the term  hereof,  subject to Section  2.1.3,  the
Board of  Directors of the Company  shall  consist of eight  members  (plus such
number of directors as may be elected from time to time pursuant to the terms of
any  Preferred  Stock  that may be issued and  outstanding  from time to time in
accordance  with the provisions of Article 6 hereof).  Subject to Section 2.1.3,
HMTF shall be entitled to designate to the Board of Directors of the Company (i)
four  individuals as long as the HMC Group owns, in the aggregate,  at least 50%
of the  number of shares of Common  Stock  owned by  HMTF/Omni  at the  Closing;
provided,  however, that one of the four individuals designated by HMTF shall be
an Independent Director, (ii) two individuals as



                                     7



<PAGE>









long as the HMC Group owns, in the aggregate,  at least 25% but less than 50% of
the number of shares of Common Stock owned by HMTF/Omni at the Closing and (iii)
one individual as long as the HMC Group owns, in the aggregate, at least 10% but
less than 25% of the number of shares of Common  Stock owned by HMTF/Omni at the
Closing  (such  designees  being  referred  to herein  individually  as an "HMTF
Designee" and collectively as the "HMTF  Designees").  Subject to Section 2.1.3,
the  Existing  Stockholders  shall be  entitled  to  designate  to the  Board of
Directors  of the  Company  (i)  four  individuals  as long as (A) the  Existing
Stockholders  own,  in the  aggregate,  at least 50% of the  number of shares of
Common Stock owned by them at the Closing and (B) Budagher  owns at least 50% of
the  number of shares of Common  Stock  owned by him at the  Closing;  provided,
however,   that  one  of  the  four  individuals   designated  by  the  Existing
Stockholders shall be an Independent Director, (ii) three individuals as long as
(A) the Existing Stockholders own, in the aggregate,  at least 49% of the number
of shares of Common Stock owned by them at the Closing and (B) Budagher  owns at
least 50% of the number of shares of Common  Stock owned by him at the  Closing,
(iii)  two  individuals  as  long  as  the  Existing  Stockholders  own,  in the
aggregate,  at least  25% but less  than 49% of the  number  of shares of Common
Stock  owned  by them at the  Closing  and (iv)  one  individual  as long as the
Existing  Stockholders own, in the aggregate,  at least 10% but less than 25% of
the  number  of  shares  of  Common  Stock  owned by them at the  Closing  (such
designees  being referred to herein  individually  as an "Existing  Stockholders
Designee"  and  collectively  as  the  "Existing  Stockholders  Designees",  and
together with the HMTF Designees,  as the  "Designees").  The Holders agree that
they will cause an individual  designated by HMTF from the HMTF  Designees to be
elected as Chairman of the Board of the  Company.  Each Holder shall vote his or
its shares of Common Stock at any regular or special  meeting of stockholders of
the  Company or in any  written  consent  executed  in lieu of such a meeting of
stockholders  and shall take all other  actions  necessary to give effect to the
agreements  contained  in  this  Stockholders   Agreement  (including,   without
limitation,  the  election  of  Persons  designated  by  HMTF  or  the  Existing
Stockholders to be elected as directors as described in the preceding sentences)
and to ensure that the articles of incorporation and bylaws of the Company as in
effect  immediately  following  the date hereof do not,  at any time  hereafter,
conflict in any respect with the provisions of this Stockholders  Agreement.  In
order to effectuate  the provisions of this Section 2, each Holder hereby agrees
that when any action or vote is required to be taken by such Holder  pursuant to
this  Stockholders  Agreement,  such Holder shall use his or its best efforts to
call, or cause the appropriate  officers and directors of the Company to call, a
special or annual meeting of stockholders of the Company



                                     8



<PAGE>









or  execute  or cause to be  executed  a consent  in writing in lieu of any such
meetings  pursuant to the applicable  provisions of the Nevada Revised Statutes,
as amended from time to time, or any successor statutes.

      (b) The Holders  acknowledge that Section 4.03 of the Amended and Restated
Articles of  Incorporation  of the Company  provides for staggered  terms of the
directors,  with directors  serving in Class 1, Class 2, or Class 3. The Holders
agree that until the first annual  meeting of  stockholders  following  the date
hereof,  the  Designees  shall be  classified  as  follows:  Class 1 --one  HMTF
Designee,  one  Existing  Stockholders  Designee  and one  Independent  Director
designated  by HMTF;  Class 2 -- one HMTF  Designee,  one Existing  Stockholders
Designee and one Independent  Director designated by the Existing  Stockholders;
and Class 3 --one HMTF Designee and one Existing Stockholders Designee.

      2.1.2  Vacancies.  If,  prior to his election to the Board of Directors of
the Company  pursuant to Section 2.1.1 hereof,  any Designee  shall be unable or
unwilling  to serve as a director  of the  Company,  the  Holder or Holders  who
designated  such Designee shall be entitled to designate a replacement who shall
then be a Designee for purposes of this Section 2. If,  following an election to
the Board of  Directors of the Company  pursuant to Section  2.1.1  hereof,  any
Designee  shall  resign or be removed or be unable to serve for any reason prior
to the  expiration  of his term as a  director  of the  Company,  the Person who
designated such director pursuant to Section 2.1.1 shall, within 30 days of such
event,  notify the Board of Directors of the Company in writing of a replacement
Designee, and either (i) the Holders shall vote their shares of Common Stock, at
any regular  meeting or special meeting at which the filling of positions on the
Board of Directors of the Company is legally permitted or in any written consent
executed  in lieu of such a meeting  of  stockholders,  and shall  take all such
other actions  necessary to ensure the election to the Board of Directors of the
Company of such replacement  Designee to fill the unexpired term of the Designee
who such replacement  Designee is replacing or (ii) the Board of Directors shall
elect or appoint such  replacement  Designee to fill the  unexpired  term of the
Designee who such replacement  Designee is replacing.  If HMTF requests that any
HMTF  Designee,   or  the  Existing   Stockholders  request  that  any  Existing
Stockholders  Designee,  be removed as a director  (with or without  cause),  by
written notice  thereof to the Company,  then the Company shall take all actions
necessary to effect,  and each of the Holders  shall vote all his or its capital
stock in favor of, such removal upon such request.




                                     9



<PAGE>









      2.1.3  Termination  of Rights.  The right of HMTF to  designate  directors
under Section 2.1.1,  and the obligation of the Holders to vote their shares for
the  HMTF  Designees,  shall  terminate  upon  the  first  to  occur  of (i) the
termination or expiration of this Stockholders Agreement or this Article 2, (ii)
such time as HMTF elects in writing to  terminate  its rights under this Article
2, or (iii) such time as the HMC Group ceases to own, in the aggregate, at least
10% of the number of shares of Common  Stock owned by  HMTF/Omni at the Closing.
The right of the Existing  Stockholders  to designate  directors  under  Section
2.1.1,  and the  obligation of the Holders to vote their shares for the Existing
Stockholders  Designees,  shall  terminate  upon  the  first to occur of (i) the
termination or expiration of this Stockholders Agreement or this Article 2, (ii)
such time as a  majority  in  interest  of the  Existing  Stockholders  elect in
writing to  terminate  their  rights under this Article 2, or (iii) such time as
the Existing  Stockholders  cease to own, in the aggregate,  at least 10% of the
number of  shares of Common  Stock  owned by the  Existing  Stockholders  at the
Closing.

      2.1.4  Costs  and   Expenses.   The  Company   will  pay  all   reasonable
out-of-pocket   expenses   incurred  by  Designees  in  connection   with  their
participation in meetings of the Board of Directors (and committees  thereof) of
the  Company  and the  Boards  of  Directors  (and  committees  thereof)  of the
Subsidiaries of the Company.

      2.1.5  Calculation of Share Numbers.  For purposes of this Article 2 only,
any  calculation of the number of shares of Common Stock owned by a Holder shall
be determined by the Board of Directors of the Company, as follows:  (i) "owned"
shall mean  Beneficial  Ownership and (ii) each  calculation  shall be equitably
adjusted for subsequent stock splits,  reverse stock splits, stock combinations,
recapitalizations, stock dividends and the like.

SECTION 2.2  Other Activities of the Holders; Fiduciary Duties.

      It is understood and accepted that the Holders and their  Affiliates  have
interests  in  other  business  ventures  which  may  be in  conflict  with  the
activities of the Company and its Subsidiaries  and that,  subject to applicable
law,  nothing in this  Stockholders  Agreement shall limit the current or future
business   activities  of  the  Holders  whether  or  not  such  activities  are
competitive  with those of the  Company  and its  Subsidiaries.  Nothing in this
Stockholders  Agreement,  express  or  implied,  shall  relieve  any  officer or
director  of the  Company  or any of its  Subsidiaries,  or any  Holder,  of any
fiduciary  or  other  duties  or  obligations  they  may  have to the  Company's
stockholders.




                                     10



<PAGE>










                                   ARTICLE 3

                              REGISTRATION RIGHTS

SECTION 3.1  Demand Registration.

      3.1.1  Request for Registration.

      (a) Subject to Section  3.1.6,  at any time,  (i) members of the HMC Group
owning 35% or more of the aggregate  number of Registrable  Shares then owned by
the HMC Group or (ii) Existing  Stockholders owning 35% or more of the aggregate
number of Registrable Shares then owned by the Existing Stockholders may request
the Company,  in writing (a "Demand Request"),  to effect the registration under
the Securities Act of all or part of its or their Registrable  Shares (a "Demand
Registration").

      (b) Each Demand  Request  shall specify the number of  Registrable  Shares
proposed to be sold. Subject to Section 3.1.6, the Company shall file the Demand
Registration  (including by means of a shelf  registration  pursuant to Rule 415
under the Securities Act if so requested by the HMC Group in such Demand Request
(but,  in the  case of a shelf  registration,  only (i) if the  Company  is then
eligible  to use such a shelf  registration  and if Form S-2 or Form S-3 (or any
successor form) is then available to the Company and (ii) if such Demand Request
is made by the HMC  Group  on a date  that is at least  three  years  after  the
Closing))  within 90 days after receiving a Demand Request (the "Required Filing
Date") and shall use all commercially reasonable efforts to cause the same to be
declared  effective  by the SEC as promptly as  practicable  after such  filing;
provided,  that the Company need effect only three Demand  Registrations  at the
request of the HMC Group and an aggregate of three Demand  Registrations  at the
request of the Existing Stockholders; provided, no such Holders will be entitled
to make such a request  while any other  registration  statement  (other  than a
shelf  registration  statement)  is on file  with  the  Commission  prior to its
becoming effective or within 90 days after such registration  statement has been
declared effective, or, in the case of a shelf registration, until 90 days after
such shelf registration  ceases to be effective.  No Holder can request a Demand
Registration  within  270  days  following  the  termination  of a  prior  shelf
registration that was the result of such Holder's Demand Request.

      3.1.2 Effective  Registration and Expenses.  A registration will not count
as a Demand  Registration  until it has become  effective  and,  with respect to
registrations other than shelf registrations,  all Registrable Shares covered by
such registration statement have been disposed of in accordance with



                                     11



<PAGE>









the intended methods of disposition  (unless the Requesting Holders withdraw all
their Registrable Shares and the Company has performed its obligations hereunder
in all  material  respects,  in which  case such  demand  will count as a Demand
Registration  unless the Requesting  Holders pay all  Registration  Expenses (as
hereinafter defined) in connection with such withdrawn registration);  provided,
that if, (i) after it has become  effective,  an offering of Registrable  Shares
pursuant to a registration is interfered with by any stop order, injunction,  or
other  order or  requirement  of the SEC or other  governmental  agency or court
(other  than  an  order,  injunction,  or  other  requirement  resulting  from a
misstatement  or omission of the Holder making such Demand  Request) or (ii) the
conditions to closing specified in the underwriting  agreement,  if any, entered
into in connection  with such  registration  are not  satisfied or waived,  such
registration  will be deemed not to have been  effected  and will not count as a
Demand Registration;  provided,  further, that the Company shall not be required
to maintain a shelf registration after 270 days from the date of effectiveness.

      3.1.3  Selection  of  Underwriters.  The  offering of  Registrable  Shares
pursuant to a Demand  Registration  shall be in the form of a "firm  commitment"
underwritten  offering.  The Requesting  Holders (as  hereinafter  defined) of a
majority of the  Registrable  Shares to be registered  in a Demand  Registration
shall select the  investment  banking  firm or firms to manage the  underwritten
offering;  provided,  that such selection shall be subject to the consent of the
Company, which consent shall not be unreasonably  withheld.  Notwithstanding the
prior sentence, no "shelf" registration will be required to be in the form of an
underwritten offering.

      3.1.4  Priority on Demand Registrations.

      (a) No securities to be sold for the account of any Person  (including the
Company) other than the HMC Group shall be included in a Demand  Registration in
which the HMC Group has requested inclusion, irrespective of the identity of the
party making the Demand Request, unless the managing underwriter or underwriters
shall advise the Company or the HMC Group in writing that the  inclusion of such
securities will not materially and adversely  affect the price or success of the
offering (a "Material Adverse Effect").  Furthermore,  in the event the managing
underwriter or underwriters  shall advise the Company or the HMC Group that even
after  exclusion of all securities of other Persons  pursuant to the immediately
preceding sentence,  the amount of Registrable Shares proposed to be included in
such  Demand  Registration  by the HMC  Group is  sufficiently  large to cause a
Material Adverse Effect, the Registrable Shares of the



                                     12



<PAGE>









HMC Group to be included in such Demand  Registration  shall equal the number of
shares  which the Company is so advised can be sold in such  offering  without a
Material Adverse Effect and such Registrable  Shares shall be allocated pro rata
among the  members  of the HMC Group on the basis of the  number of  Registrable
Shares requested to be included by each such Holder.  If any Registrable  Shares
of any Holder  requested to be  registered  pursuant to a Demand  Request  under
Section 3.1.1 are excluded from a Demand  Registration  pursuant to this Section
3.1.4, such Holder having Registrable Shares so excluded shall have the right to
withdraw  all,  but not  less  than  all,  such  Registrable  Shares  from  such
registration and such registration will not count as a Demand  Registration with
respect to such Holder.

      (b) Notwithstanding Section 3.1.4(a) above, Carpenter shall have the right
to sell in a Demand  Registration under this Article 3 all or any portion of the
Carpenter  Priority Shares on a pari passu basis with the HMC Group,  calculated
pro rata on the basis of the number of  Registrable  Shares owned by each party.
In the event that Carpenter  requests inclusion of the Carpenter Priority Shares
in a Demand  Registration in which the HMC Group  participates  and the managing
underwriter  or  underwriters  advises  the  Company  or the HMC Group  that the
inclusion of such securities  likely will result in a Material Adverse Effect so
that it  becomes  necessary  to reduce the  number of  Registrable  Shares to be
registered, in no event shall the number of Carpenter Priority Shares to be sold
in such  registration be reduced to fewer than 150,000  shares,  irrespective of
the other provisions hereof,  unless the number of Registrable Shares to be sold
by the HMC Group in such offering is also reduced to fewer than 150,000  shares,
in which event each of the HMC Group,  on the one hand,  and  Carpenter,  on the
other hand, will suffer equivalent  share-for-share  reduction thereafter to the
extent  necessary to reach the number of Registrable  Shares that can be sold in
such offering without a Material  Adverse Effect.  At such time as the Carpenter
Priority  Shares have been  disposed of  pursuant to an  effective  registration
statement, Carpenter's rights pursuant to this Section 3.1.4(b) shall terminate.
For purposes hereof,  "Carpenter  Priority Shares" shall mean a number of shares
of Common  Stock  equal to 10% of the number of shares of Common  Stock owned of
record by Carpenter at the Closing. As used in this Section 3.1.4, any reference
to the number of shares of Common  Stock owned by  Carpenter  shall be deemed to
include subsequent  equitable  adjustments as necessary to reflect stock splits,
reverse stock splits, stock combinations, recapitalizations, stock dividends and
the like.

      (c) In the event  that the  managing  underwriter  or  underwriters  shall
advise the Company or the HMC Group in writing



                                     13



<PAGE>









that the inclusion of additional  Registrable Shares in a Demand Registration by
the Requesting  Holders will not have a Material Adverse Effect,  the Requesting
Holders  shall be  permitted  to include  in such  registration  that  number of
Registrable Shares that in the view of the managing underwriter in the aggregate
does not  create a  Material  Adverse  Effect.  In the event  that the  managing
underwriter or underwriters shall advise the Company or the HMC Group in writing
that the maximum  number of Registrable  Shares  requested to be included by the
Requesting Holders (other than the HMC Group and Carpenter, to the extent of his
rights under Section 3.1.4(b)) likely will have a Material Adverse Effect,  such
Requesting  Holders  will be  permitted  to include  that number of  Registrable
Shares that, in the view  (expressed in writing) of the managing  underwriter or
underwriters,  will not result in a Material Adverse Effect, pro rata among such
Requesting Holders on the basis of the number of Registrable Shares requested to
be included in such registration by each such Requesting Holder.

      3.1.5 Rights of Nonrequesting Holders. Upon receipt of any Demand Request,
the Company shall promptly (but in any event within 10 days) give written notice
of  such  proposed  Demand   Registration  to  all  other  Holders  entitled  to
registration   rights  under  this  Section  3.1,  who  shall  have  the  right,
exercisable  by written notice to the Company within 20 days of their receipt of
the  Company's  notice,  to elect to include in such  Demand  Registration  such
portion of their Registrable Shares as they may request.  All Holders requesting
to have their Registrable Shares included in a Demand Registration in accordance
with the  preceding  sentence  shall be deemed to be  "Requesting  Holders"  for
purposes of this Section 3.1; provided, if any member of the HMC Group or any of
the  Existing  Stockholders  participates  as a  Requesting  Holder  in a Demand
Registration such Holder's participation shall be counted as a Demand Request of
the HMC Group or the Existing Stockholders, respectively.

      3.1.6  Deferral  of Filing.  The Company may defer the filing (but not the
preparation)  of a registration  statement  required by Section 3.1 until a date
not later than 180 days after the Required Filing Date (or, if longer,  180 days
after the effective date of the  registration  statement  contemplated by clause
(ii)  below) if (i) at the time the Company  receives  the Demand  Request,  the
Company or any of its  Subsidiaries is engaged in  confidential  negotiations or
other confidential business activities, disclosure of which would be required in
such  registration  statement  (but would not be required  if such  registration
statement were not filed),  and the Board of Directors of the Company determines
in good  faith  that such  disclosure  would be  materially  detrimental  to the
Company and its



                                     14



<PAGE>









stockholders  or would have a material  adverse effect on any such  confidential
negotiations  or  other  confidential  business  activities,  or (ii)  prior  to
receiving the Demand Request,  the Board of Directors had determined to effect a
registered  underwritten  public  offering of the Company's  securities  for the
Company's account and the Company had taken  substantial  steps (including,  but
not  limited to,  selecting a managing  underwriter  for such  offering)  and is
proceeding with reasonable  diligence to effect such offering. A deferral of the
filing of a  registration  statement  pursuant  to this  Section  3.1.6 shall be
lifted, and the requested registration  statement shall be filed forthwith,  but
no later  than 90 days  thereafter,  if, in the case of a deferral  pursuant  to
clause (i) of the preceding  sentence,  the negotiations or other activities are
disclosed or terminated,  or, in the case of a deferral  pursuant to clause (ii)
of the preceding sentence,  the proposed  registration for the Company's account
is abandoned.  In order to defer the filing of a registration statement pursuant
to this Section  3.1.6,  the Company shall  promptly (but in any event within 10
Business  Days),  upon  determining  to  seek  such  deferral,  deliver  to each
Requesting  Holder a certificate  signed by an executive  officer of the Company
stating that the Company is deferring such filing pursuant to this Section 3.1.6
and a general  statement of the reason for such deferral (but only to the extent
such general statement is in compliance with applicable  securities laws) and an
approximation  of the  anticipated  delay.  Within 20 days after  receiving such
certificate,  the  holders of a majority of the  Registrable  Shares held by the
Requesting  Holders and for which  registration  was  previously  requested  may
withdraw such Demand Request by giving notice to the Company; if withdrawn,  the
Demand  Request  shall be deemed not to have been made for all  purposes of this
Stockholders  Agreement.  The  Company  may  defer the  filing  of a  particular
registration statement pursuant to this Section 3.1.6 only once.

SECTION 3.2  Piggyback Registrations.

      3.2.1 Right to Piggyback.  Each time the Company  proposes to register any
of its equity  securities  of the same class (other than pursuant to an Excluded
Registration or a Demand  Registration) under the Securities Act for sale to the
public  (whether  for  the  account  of  the  Company  or  the  account  of  any
securityholder of the Company) and the form of registration statement to be used
permits the  registration of Registrable  Shares,  the Company shall give prompt
written notice to each Holder of Registrable Shares (which notice shall be given
not less than 30 days prior to the effective date of the Company's  registration
statement), which notice shall offer each such Holder the opportunity to include
any or all of its or his



                                     15



<PAGE>









Registrable  Shares in such registration  statement,  subject to the limitations
contained in Section  3.2.2  hereof.  Each Holder who desires to have its or his
Registrable  Shares included in such registration  statement shall so advise the
Company  in writing  (stating  the number of  Registrable  Shares  desired to be
registered)  within 20 days after the date of such notice from the Company.  Any
Holder shall have the right to withdraw such  Holder's  request for inclusion of
such Holder's Registrable Shares in any registration  statement pursuant to this
Section  3.2.1 by giving  written  notice  to the  Company  of such  withdrawal.
Subject to Section 3.2.2 below,  the Company shall include in such  registration
statement  all such  Registrable  Shares so  requested  to be included  therein;
provided, however, that the Company may at any time withdraw or cease proceeding
with any such  registration  if it shall  at the  same  time  withdraw  or cease
proceeding  with the  registration  of all other  equity  securities  originally
proposed to be registered.

      3.2.2 Priority on Registrations.  If the managing  underwriter advises the
Company that the inclusion of Registrable  Shares would cause a Material Adverse
Effect, the Company will be obligated to include in such registration  statement
the  Registrable  Shares of the  Holders in  sequence,  in  accordance  with the
following:

      (a) in the case of an offering by the  Company  for its own  account,  (A)
first, any and all securities for sale by the Company,  (B) second,  Registrable
Shares requested to be included in such  registration by the HMC Group, pro rata
based on the ratio which such requested  Registrable Shares from each Holder who
is a member of the HMC Group  bears to the total  number of  Registrable  Shares
requested  to be  included  in such  registration  statement  by Holders who are
members of the HMC Group, (C) third, Registrable Shares requested to be included
in such  registration  by the other  Holders,  pro rata based on the ratio which
such  requested  Registrable  Shares  bears to the total  number of  Registrable
Shares requested to be included in such registration  statement by such Holders,
and (D)  fourth,  securities  requested  to be  included  in  such  registration
statement pursuant to any other  registration  rights that may have been, or may
hereafter  be,  granted by the  Company,  pro rata based on the ratio which such
requested  securities  bears to the total number of  securities  requested to be
included in such registration statement by all other Persons;

      (b) in the case of an  offering  by the  Company for the account of any of
its  securityholders  (other than the  Holders) of any class of equity  security
pursuant to the exercise of demand registration rights by such  securityholders,
(A) first,



                                     16



<PAGE>









securities requested to be registered by any such securityholder pursuant to the
exercise of such demand  registration rights and Registrable Shares requested to
be included in such  registration by the HMC Group,  pro rata based on the ratio
which  such  requested  securities  bears  to the  total  number  of  securities
requested  to  be  included  in  such  registration  statement  by  the  Persons
exercising  such  demand  and the HMC  Group,  (B)  second,  Registrable  Shares
requested to be  registered  by the other  Holders,  pro rata based on the ratio
which such requested Registrable Shares bears to the total number of Registrable
Shares requested to be registered by such Holders, and (C) third, securities for
the account of the  Company.  If as a result of the  provisions  of this Section
3.2.2 any Holder  shall not be entitled to include all  Registrable  Shares in a
registration  that such Holder has requested to be so included,  such Holder may
withdraw  such  Holder's   request  to  include   Registrable   Shares  in  such
registration statement; and

      (c)  notwithstanding  the other  provisions  of this  Section  3.2.2,  the
provisions of Section 3.1.4(b) shall apply as to the Carpenter Priority Shares.

      No Person may participate in any registration  statement  hereunder unless
such  Person (i) agrees to sell such  person's  Registrable  Shares on the basis
provided  in any  underwriting  arrangements  approved  by the  Company and (ii)
completes  and executes  all  questionnaires,  powers of attorney,  indemnities,
underwriting agreements, and other documents reasonably required under the terms
of such underwriting arrangements;  provided, however, that no such Person shall
be required to make any  representations  or warranties  in connection  with any
such  registration  other than  representations  and  warranties  as to (i) such
Person's  ownership of his or its  Registrable  Shares to be sold or transferred
free and clear of all liens, claims, and encumbrances,  (ii) such Person's power
and  authority to effect such  transfer,  and (iii) such matters  pertaining  to
compliance  with  securities  laws  as may be  reasonably  requested;  provided,
further,  that the  obligation of such Person to indemnify  pursuant to any such
underwriting  arrangements shall be several,  not joint and several,  among such
Persons selling  Registrable  Shares, and the liability of each such Person will
be in proportion  to, and provided  further that such  liability will be limited
to,  the  net  amount  received  by  such  Person  from  the  sale of his or its
Registrable Shares pursuant to such registration.

      3.3 Holdback Agreement.  Unless the managing underwriter otherwise agrees,
(i) each of the Holders agrees,  (ii) the Company agrees,  and (iii) each Holder
and the  Company  agrees to use his or its  commercially  reasonable  efforts to
cause its



                                     17



<PAGE>









controlled  Affiliates to agree,  not to effect any public sale or private offer
or distribution of any Common Stock or Common Stock  Equivalents  during the ten
Business  Days  prior  to the  effectiveness  under  the  Securities  Act of any
underwritten  registration  and during such time period after the  effectiveness
under the Securities  Act of any  underwritten  registration  (not to exceed 180
days) (except, if applicable, as part of such underwritten  registration) as the
Company and the managing underwriter may agree.

      3.4   Registration  Procedures. Whenever any Holder has requested that any
Registrable Shares be registered  pursuant to this Stockholders  Agreement,  the
Company will use its commercially  reasonable efforts to effect the registration
and the sale of such  Registrable  Shares in accordance with the intended method
of disposition  thereof,  and pursuant thereto the Company will as expeditiously
as possible:

      3.4.1  Prepare  and file  with  the SEC a  registration  statement  on any
appropriate  form (subject to Section  3.1.1(b))  under the  Securities Act with
respect to such Registrable  Shares and use its commercially  reasonable efforts
to cause such registration statement to become effective;

      3.4.2  Prepare  and  file  with the SEC  such  amendments,  post-effective
amendments,  and supplements to such  registration  statement and the prospectus
used in  connection  therewith  as may be  necessary  to keep such  registration
statement effective for a period of not less than 30 days (or such lesser period
as is necessary for the underwriters in an underwritten  offering to sell unsold
allotments);

      3.4.3 Furnish to each Holder of Registrable Shares and the underwriters of
the  securities  being  registered  such  number of copies of such  registration
statement,  each amendment and supplement  thereto,  the prospectus  included in
such  registration  statement  (including  each  preliminary  prospectus),   any
documents  incorporated  by reference  therein and such other  documents as such
Holder  or  underwriters  may  reasonably  request  in order to  facilitate  the
disposition of the  Registrable  Shares owned by such Holder or the sale of such
securities by such  underwriters (it being  understood that,  subject to Section
3.5 and the  requirements of the Securities Act and applicable  state securities
laws,  the Company  consents to the use of the  prospectus  and any amendment or
supplement  thereto by each Holder and the  underwriters  in connection with the
offering  and  sale  of the  Registrable  Shares  covered  by  the  registration
statement of which such prospectus, amendment or supplement is a part);




                                     18



<PAGE>









      3.4.4 Use its commercially  reasonable  efforts to register or qualify (to
the extent required by law) such Registrable  Shares under such other securities
or blue sky laws of such  jurisdictions as the managing  underwriter  reasonably
requests; use its commercially reasonable efforts to keep each such registration
or qualification (or exemption  therefrom)  effective during the period in which
such registration statement is required to be kept effective; and do any and all
other acts and things which may be  reasonably  necessary or advisable to enable
each Holder to consummate  the  disposition of the  Registrable  Shares owned by
such Holder in such jurisdictions;  provided, however, that the Company will not
be required to (i) qualify generally to do business in any jurisdiction where it
would not  otherwise  be required to qualify but for this  subparagraph  or (ii)
consent to general service of process in any such jurisdiction;

      3.4.5  Advise  each  Holder of such  Registrable  Shares  who is a selling
securityholder  in such  registration,  promptly after the Company shall receive
notice or obtain knowledge thereof, (i) of the issuance of any stop order by the
SEC suspending the effectiveness of such  registration  statement or (ii) of the
initiation or  threatening  of any  proceeding for such purpose and promptly use
its  commercially  reasonable  best  efforts to prevent the issuance of any stop
order or to obtain its withdrawal at the earliest  possible  moment if such stop
order should be issued;

      3.4.6 Promptly notify each Holder who is a selling  securityholder in such
registration  and each underwriter and (if requested by any such Person) confirm
such notice in writing (i) when a prospectus  or any  prospectus  supplement  or
post-effective  amendment  has been filed and,  with  respect to a  registration
statement or any post-effective  amendment,  when the same has become effective,
(ii) of the issuance by any state  securities or other  regulatory  authority of
any order suspending the qualification or exemption from qualification of any of
the  Registrable  Shares  under  state  securities  or  "blue  sky"  laws or the
initiation of any  proceedings  for that purpose,  and (iii) of the happening of
any event which makes any statement made in a registration  statement or related
prospectus  untrue in any material  respect or which  requires the making of any
changes in such  registration  statement,  prospectus  or documents so that they
will not contain any untrue  statement  of a material  fact or omit to state any
material fact required to be stated  therein or necessary to make the statements
therein not misleading, and, as promptly as practicable thereafter,  prepare and
file with the SEC and furnish a supplement  or amendment to such  prospectus  so
that, as thereafter  deliverable to the purchasers of such  Registrable  Shares,
such prospectus will not contain any untrue statement of



                                     19



<PAGE>









a  material  fact or omit a  material  fact  necessary  to make  the  statements
therein,  in  light  of the  circumstances  under  which  they  were  made,  not
misleading;

      3.4.7  Make  generally  available  to  the  Company's  securityholders  an
earnings statement  satisfying the provisions of Section 11(a) of the Securities
Act no later than 30 days after the end of the 12-month  period  beginning  with
the  first  day of the  Company's  first  fiscal  quarter  commencing  after the
effective date of a registration statement, which earnings statement shall cover
said 12-month  period,  and which  requirement will be deemed to be satisfied if
the Company timely files complete and accurate  information on Forms 10-Q,  10-K
and 8-K under the Exchange Act and  otherwise  complies  with Rule 158 under the
Securities Act;

      3.4.8 If  requested  by the managing  underwriter  or any Holder  promptly
incorporate  in  a  prospectus  supplement  or  post-effective   amendment  such
information as the managing  underwriter or any Holder of securities  registered
in such  registration  reasonably  requests to be included  therein,  including,
without  limitation,  with respect to the Registrable  Shares being sold by such
Holder  thereunder,  the purchase price being paid therefor by the  underwriters
and  with  respect  to any  other  terms  of the  underwritten  offering  of the
Registrable  Shares to be sold in such offering,  and promptly make all required
filings of such prospectus supplement or post-effective amendment;

      3.4.9 As promptly as practicable after filing with the SEC of any document
which is incorporated by reference into a registration statement (in the form in
which it was incorporated),  deliver a copy of each such document to each Holder
of securities registered in such registration;

      3.4.10  Cooperate  with  the  Holders  of  securities  registered  in such
registration and the managing  underwriter to facilitate the timely  preparation
and  delivery of  certificates  (which  shall not bear any  restrictive  legends
unless  required under  applicable law)  representing  securities sold under any
registration  statement,  and enable such securities to be in such denominations
and  registered  in such names as the  managing  underwriter  or such Holders of
securities  registered in such  registration  may request and keep available and
make  available to the Company's  transfer agent prior to the  effectiveness  of
such registration statement a supply of such certificates;

      3.4.11  Promptly make available for inspection by any Holder of securities
registered  in  such   registration,   any  underwriter   participating  in  any
disposition pursuant to any



                                     20



<PAGE>









registration  statement,  and  any  attorney,   accountant  or  other  agent  or
representative  retained by any such Holder or  underwriter  (collectively,  the
"Inspectors"),  all financial and other records,  pertinent  corporate documents
and  properties  of the  Company  (collectively,  the  "Records"),  as  shall be
reasonably   necessary   to  enable  them  to  exercise   their  due   diligence
responsibility,  and cause the  Company's  officers,  directors and employees to
supply all  information  requested by any such Inspector in connection with such
registration statement; provided, that, unless the disclosure of such Records is
necessary  to avoid or correct a  misstatement  or omission in the  registration
statement  or the release of such  Records is ordered  pursuant to a subpoena or
other order from a court of  competent  jurisdiction,  the Company  shall not be
required to provide any information  under this  subparagraph if (i) the Company
believes,  after consultation with counsel for the Company,  that to do so would
cause the Company to forfeit an attorney-client privilege that was applicable to
such  information  or (ii) if either  (A) the  Company  has  requested  and been
granted from the SEC confidential treatment of such information contained in any
filing with the SEC or documents provided supplementally or otherwise or (B) the
Company  reasonably  determines in good faith that such Records are confidential
and so notifies the  Inspectors in writing  unless prior to furnishing  any such
information  with  respect  to (i) or (ii)  such  Holder of  Registrable  Shares
requesting such information agrees to enter into a confidentiality  agreement in
customary form and subject to customary exceptions; and provided,  further, that
each such Holder of Registrable  Shares agrees that it will,  upon learning that
disclosure of such Records is sought in a court of competent jurisdiction,  give
notice to the  Company  and allow  the  Company  at its  expense,  to  undertake
appropriate action and to prevent disclosure of the Records deemed confidential;

      3.4.12 Furnish to each Holder selling  securities in such registration and
underwriter a signed counterpart of (i) an opinion or opinions of counsel to the
Company,  and (ii) a  comfort  letter  or  comfort  letters  from the  Company's
independent public accountants, each in customary form and covering such matters
of the type customarily  covered by opinions or comfort letters, as the case may
be,  as  the  Holders  selling  securities  in  such  registration  or  managing
underwriter reasonably requests;

      3.4.13 Cause the Registrable Shares included in any registration statement
to be (i)  listed  on  each  securities  exchange,  if  any,  on  which  similar
securities  issued by the  Company are then  listed,  or (ii)  authorized  to be
quoted and/or listed (to the extent  applicable) on the National  Association of
Securities Dealers, Inc. Automated  Quotation ("NASDAQ") or the  National Market
System of NASDAQ if the Registrable Shares so qualify;


                                     21



<PAGE>











      3.4.14 Provide a CUSIP number for the  Registrable  Shares included in any
registration  statement not later than the effective  date of such  registration
statement;

      3.4.15 Cooperate with each Holder selling  securities in such registration
and each underwriter participating in the disposition of such Registrable Shares
and their respective  counsel in connection with any filings required to be made
with the NASD;

      3.4.16  During the period when the  prospectus is required to be delivered
under the Securities Act, promptly file all documents  required to be filed with
the SEC pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act;

      3.4.17 Notify each Holder selling securities in such registration promptly
of any request by the SEC for the amending or supplementing of such registration
statement or prospectus or for additional information;

      3.4.18   Prepare  and  file  with  the  SEC  promptly  any  amendments  or
supplements to such  registration  statement or prospectus which, in the opinion
of  counsel  for the  Company  or the  managing  underwriter,  are  required  in
connection with the distribution of the Registrable Shares; and

      3.4.19 Enter into such agreements  (including  underwriting  agreements in
the managing  underwriter's  customary form) as are customary in connection with
an underwritten registration.

      3.5 Suspension of  Dispositions.  Each Holder agrees by acquisition of any
Registrable Shares that, upon receipt of any notice (a "Suspension Notice") from
the  Company of the  happening  of any event of the kind  described  in Sections
3.4.5(i) or  3.4.6(iii)  (a  "Suspension  Event"),  such  Holder will  forthwith
discontinue disposition of Registrable Shares until such Holder's receipt of the
copies of the  supplemented  or  amended  prospectus,  or until it is advised in
writing  (the  "Advice") by the Company  that the use of the  prospectus  may be
resumed, and has received copies of any additional or supplemental filings which
are  incorporated  by  reference in the  prospectus,  and, if so directed by the
Company,  such  Holder  will  deliver  to the  Company  all  copies,  other than
permanent  file  copies  then in such  Holder's  possession,  of the  prospectus
covering  such  Registrable  Shares  current  at  the  time  of  receipt  of the
Suspension  Notice.  In the event the Company shall give any Suspension  Notice,
the time



                                     22



<PAGE>









period  regarding the  effectiveness  of  registration  statements  set forth in
Section  3.4.2  hereof shall be extended by the number of days during the period
from and  including  the date of the  giving  of the  Suspension  Notice  to and
including  the date  when each  seller of  Registrable  Shares  covered  by such
registration  statement  shall have received the copies of the  supplemented  or
amended  prospectus  or the  Advice.  The  Company  shall  use its  commercially
reasonable  efforts and take such actions as are reasonably  necessary to render
the Advice as promptly as practicable following the conclusion of the Suspension
Event.  The Company  shall suspend the use of any shelf  registration  statement
during a  Suspension  Event and shall so notify any  Holders  having  securities
registered thereunder in accordance with this Section 3.5.

      3.6  Registration   Expenses.  All  expenses  incident  to  the  Company's
performance of or compliance with this Article 3, including, without limitation,
all registration and filing fees, all fees and expenses  associated with filings
required  to be made  with  the NASD  (including,  if  applicable,  the fees and
expenses of any "qualified  independent  underwriter" as such term is defined in
Rule  2720(b)(15)  of the NASD  Conduct  Rules  and of its  counsel),  as may be
required  by the  rules  and  regulations  of the  NASD,  fees and  expenses  of
compliance  with  securities or "blue sky" laws  (including  reasonable fees and
disbursements  of counsel in connection  with "blue sky"  qualifications  of the
Registrable  Shares),  rating agency fees, printing expenses (including expenses
of printing  certificates  for the  Registrable  Shares in a form  eligible  for
deposit with The Depository  Trust Company and of printing  prospectuses  if the
printing of  prospectuses  is  reasonably  requested by a Holder of  Registrable
Shares),  messenger  and delivery  expenses,  the  Company's  internal  expenses
(including,  without  limitation,  all salaries and expenses of its officers and
employees performing legal or accounting duties), the fees and expenses incurred
in connection with any listing of the Registrable  Shares,  fees and expenses of
counsel  for  the  Company  and its  independent  certified  public  accountants
(including the expenses of any special audit or "cold comfort"  letters required
by or incident to such performance),  Securities Act liability insurance (if the
Company elects to obtain such  insurance),  the fees and expenses of any special
experts  retained by the Company in connection with such  registration,  and the
fees and expenses of other Persons  retained by the Company and reasonable  fees
and expenses of one firm of counsel for the sellers  (which shall be selected by
the  Holders of a majority  of the  Registrable  Shares  being  included  in any
particular  registration  statement)  (all such  expenses  being  herein  called
"Registration  Expenses")  will  be  borne  by the  Company  whether  or not any
registration statement becomes effective; provided that



                                     23



<PAGE>









in no event shall  Registration  Expenses  include any  underwriting  discounts,
commissions,  or fees attributable to the sale of the Registrable  Shares or any
counsel, accountants, or other Persons retained or employed by the Holders.

      3.7   Indemnification.

      3.7.1 The Company agrees to indemnify and reimburse, to the fullest extent
permitted by law, each Holder of Registrable  Shares, and each of its employees,
advisors, agents,  representatives,  partners,  officers, and directors and each
Person who controls such Holder (within the meaning of the Securities Act or the
Exchange Act) and any agent or investment  advisor  thereof  (collectively,  the
"Seller  Affiliates")  (i)  against  any  and  all  losses,   claims,   damages,
liabilities,  and expenses,  joint or several  (including,  without  limitation,
attorneys'  fees and  disbursements  except as limited by Section  3.7.3)  based
upon,  arising out of, related to or resulting from any untrue or alleged untrue
statement  of  a  material  fact  contained  in  any   registration   statement,
prospectus,  or  preliminary  prospectus or any amendment  thereof or supplement
thereto,  or any omission or alleged  omission of a material fact required to be
stated therein or necessary to make the statements therein not misleading,  (ii)
against any and all loss,  liability,  claim,  damage,  and expenses  whatsoever
(including  reasonable fees and disbursements of counsel),  as incurred,  to the
extent  of the  aggregate  amount  paid in  connection  with the  settlement  or
disposition of any litigation or investigation or proceeding by any governmental
agency or body, commenced or threatened,  or of any claim whatsoever based upon,
arising  out of,  related to or  resulting  from any such  untrue  statement  or
omission or alleged untrue statement or omission,  and (iii) against any and all
costs and expenses  (including  reasonable fees and disbursements of counsel) as
may be reasonably incurred in investigating, preparing, or defending against any
litigation,  or investigation or proceeding by any governmental  agency or body,
commenced or threatened,  or any claim  whatsoever  based upon,  arising out of,
related to or  resulting  from any such untrue  statement or omission or alleged
untrue statement or omission, to the extent that any such expense or cost is not
paid under  subparagraph (i) or (ii) above;  except insofar as the same are made
in reliance upon and in strict conformity with information  furnished in writing
to the Company by such Holder or any Seller Affiliate  expressly for use therein
or arise from such Holder's or any Seller Affiliate's  failure to deliver a copy
of the  registration  statement or prospectus or any  amendments or  supplements
thereto after the Company has furnished  such Holder or Seller  Affiliate with a
sufficient  number of copies of the same.  The  reimbursements  required by this
Section 3.7.1 will be made by



                                     24



<PAGE>









periodic payments during the course of the investigation or defense, as and when
bills are received or expenses incurred.

            3.7.2 In  connection  with  any  registration  statement  in which a
Holder of Registrable Shares is participating,  each such Holder will furnish to
the Company in writing such information and affidavits as the Company reasonably
requests  for  use  in  connection  with  any  such  registration  statement  or
prospectus  and, to the fullest  extent  permitted by law, each such Holder will
indemnify  the  Company  and its  directors  and  officers  and each  Person who
controls the Company  (within the meaning of the  Securities Act or the Exchange
Act)  against any and all losses,  claims,  damages,  liabilities,  and expenses
(including,  without  limitation,  reasonable  attorneys' fees and disbursements
except as limited by  Section  3.7.3)  resulting  from any untrue  statement  or
alleged  untrue  statement  of a material  fact  contained  in the  registration
statement, prospectus, or any preliminary prospectus or any amendment thereof or
supplement  thereto or any  omission  or  alleged  omission  of a material  fact
required to be stated  therein or necessary to make the  statements  therein not
misleading,  but only to the extent that such untrue statement or alleged untrue
statement or omission or alleged  omission is contained  in any  information  or
affidavit so furnished in writing by such Holder or any of its Seller Affiliates
expressly  for  inclusion  in the  registration  statement;  provided  that  the
obligation  to  indemnify  will be several,  not joint and  several,  among such
Holders  of  Registrable  Shares,  and the  liability  of each  such  Holder  of
Registrable  Shares will be in proportion  to, and provided  further,  that such
liability  will be limited  to, the net amount  received by such Holder from the
sale of Registrable  Shares pursuant to such registration  statement;  provided,
however,  that such Holder of Registrable Shares shall not be liable in any such
case to the extent that prior to the filing of any such  registration  statement
or  prospectus  or  amendment  thereof or  supplement  thereto,  such Holder has
furnished  in  writing  to the  Company  information  expressly  for use in such
registration  statement or  prospectus  or any  amendment  thereof or supplement
thereto which corrected or made not misleading  information previously furnished
to the Company.

            3.7.3 Any Person entitled to indemnification hereunder will (i) give
prompt  written  notice to the  indemnifying  party of any claim with respect to
which it seeks  indemnification  (provided  that the failure to give such notice
shall  not limit  the  rights of such  Person  unless  such  failure  materially
prejudices the ability of the indemnifying  party to defend such claim) and (ii)
unless in such indemnified  party's  reasonable  judgment a conflict of interest
between such indemnified and indemnifying parties may exist with respect to such
claim, permit



                                     25



<PAGE>









such  indemnifying  party to assume  the  defense  of such  claim  with  counsel
reasonably  satisfactory to the indemnified party;  provided,  however, that any
Person  entitled  to  indemnification  hereunder  shall have the right to employ
separate  counsel and to participate in the defense of such claim,  but the fees
and expenses of such counsel  shall be at the expense of such Person  unless (A)
the  indemnifying  party has  agreed to pay such  fees or  expenses,  or (B) the
indemnifying  party  shall have  failed to assume the  defense of such claim and
employ counsel  reasonably  satisfactory to such person.  If such defense is not
assumed by the indemnifying party as permitted hereunder, the indemnifying party
will not be subject to any liability for any settlement  made by the indemnified
party without its consent (but such consent will not be unreasonably  withheld).
If such defense is assumed by the indemnifying  party pursuant to the provisions
hereof,  such  indemnifying  party shall not settle or otherwise  compromise the
applicable  claim unless (X) such  settlement or compromise  contains a full and
unconditional  release of the  indemnified  party or (Y) the  indemnified  party
otherwise consents in writing.  An indemnifying party who is not entitled to, or
elects not to,  assume the defense of a claim will not be  obligated  to pay the
fees and expenses of more than one counsel for all parties  indemnified  by such
indemnifying  party with respect to such claim and one additional  local counsel
in each jurisdiction involved, as necessary,  unless, in the reasonable judgment
of any  indemnified  party,  a  conflict  of  interest  may exist  between  such
indemnified party and any other of such indemnified parties with respect to such
claim,  in which  event the  indemnifying  party shall be  obligated  to pay the
reasonable fees and disbursements of such additional counsel or counsels.

            3.7.4  Each  party  hereto  agrees  that,  if  for  any  reason  the
indemnification  provisions  contemplated  by Section 3.7.1 or Section 3.7.2 are
unavailable to or insufficient to hold harmless an indemnified  party in respect
of any losses, claims, damages,  liabilities, or expenses (or actions in respect
thereof) referred to therein,  then each indemnifying  party shall contribute to
the amount paid or payable by such indemnified party as a result of such losses,
claims,  damages,  liabilities,  or expenses (or actions in respect  thereof) in
such  proportion  as is  appropriate  to  reflect  the  relative  fault  of  the
indemnifying  party and the  indemnified  party in  connection  with the actions
which resulted in the losses, claims,  damages,  liabilities or expenses as well
as any other  relevant  equitable  considerations.  The  relative  fault of such
indemnifying  party and  indemnified  party shall be determined by reference to,
among other things, whether the untrue or alleged untrue statement of a material
fact or  omission  or  alleged  omission  to state a  material  fact  relates to
information supplied by such indemnifying party or indemnified



                                     26



<PAGE>









party, and the parties'  relative intent,  knowledge,  access to information and
opportunity to correct or prevent such statement or omission. The parties hereto
agree that it would not be just and equitable if  contribution  pursuant to this
Section 3.7.4 were determined by pro rata allocation (even if the Holders or any
underwriters  or all of them were treated as one entity for such  purpose) or by
any other  method of  allocation  which does not take  account of the  equitable
considerations  referred to in this Section 3.7.4. The amount paid or payable by
an indemnified party as a result of the losses, claims, damages, liabilities, or
expenses  (or actions in respect  thereof)  referred to above shall be deemed to
include  any  legal  or  other  fees or  expenses  reasonably  incurred  by such
indemnified  party in connection  with  investigating  or, except as provided in
Section  3.7.3,  defending  any  such  action  or  claim.   Notwithstanding  the
provisions of this Section  3.7.4,  no Holder shall be required to contribute an
amount  greater than the dollar  amount by which the  proceeds  received by such
Holder with respect to the sale of any Registrable  Shares exceeds the amount of
damages which such Holder has  otherwise  been required to pay by reason of such
statement or omission. No Person guilty of fraudulent  misrepresentation (within
the  meaning of  Section  11(f) of the  Securities  Act)  shall be  entitled  to
contribution   from  any  Person   who  was  not   guilty  of  such   fraudulent
misrepresentation.  The Holders' obligations in this Section 3.7.4 to contribute
shall be several,  and not joint,  in  proportion  to the amount of  Registrable
Shares  registered by them. If  indemnification  is available under this Section
3.7, the indemnifying parties shall indemnify each indemnified party to the full
extent  provided  in  Section  3.7.1 and  Section  3.7.2  without  regard to the
relative  fault of said  indemnifying  party or  indemnified  party or any other
equitable consideration provided for in this Section 3.7.4.

      3.7.5  The  indemnification  and  contribution  provided  for  under  this
Stockholders  Agreement  will remain in full force and effect  regardless of any
investigation  made by or on behalf  of the  indemnified  party or any  officer,
director,  or controlling  Person of such indemnified party and will survive the
transfer of Securities and the termination of this Stockholders Agreement.

      3.7.6 The Company hereby agrees that it will not enter into, grant, assume
obligations  under, or otherwise permit to exist any registration  rights of any
Person  or  Persons  except  as  expressly  set  forth  herein  unless  (i) such
registration  rights are not  inconsistent or in conflict with the  registration
rights  granted in this Article 3 and (ii) the Person or Persons  receiving  the
benefits  of  such  registration   rights   acknowledge  in  writing  that  such
registration  rights are subject to the terms and provisions of the registration
rights granted herein.



                                     27



<PAGE>











                                   ARTICLE 4

                            TRANSFERS OF SECURITIES

SECTION 4.1  Right of First Offer.

      4.1.1  Sale of Shares of Common Stock.

      (a) If the  HMC  Group  (taken  as a  whole)  or  either  of the  Existing
Stockholders  (each, a "Transferor")  proposes to Transfer for value 90% or more
of the  number of shares of Common  Stock then  owned by the  Transferor  to any
third party, in one transaction or a series of related  transactions (other than
sales to the public pursuant to an effective  registration statement or sales to
the public pursuant to Rule 144 under the Securities  Act), the Transferor shall
first give written notice to the Company of such desire, setting forth the terms
and  conditions  of the  proposed  sale and the  price at which  the  Transferor
desires to sell.  The Company  shall  thereupon,  within ten (10)  Business Days
following its receipt of the foregoing  notice (the "Election  Period"),  notify
the Transferor in writing of its election to either (i) acquire the Common Stock
proposed  to be sold by the  Transferor,  in which  event the  Company  shall be
obligated to acquire such stock upon the same terms and conditions  contained in
such notice,  subject to a definitive written agreement between the parties,  or
(ii) not to acquire such  interests.  Failure to respond to the Transferor  with
regard to a notice of a proposed  sale prior to the  expiration  of the Election
Period shall be deemed to be an election not to acquire the capital stock of the
Transferor.

      (b) If the  Transferor  satisfies all of the foregoing  conditions and the
Company has not given  notice of its  intention  to purchase the Common Stock of
the Transferor to be transferred, the Transferor may, upon the expiration of the
Election  Period and subject to Section 4.2,  transfer  such Common Stock to any
other Person at a purchase  price equal to or higher than the price set forth in
the notice given the Company and  otherwise  upon the same terms and  conditions
contained in the election notice.

      4.1.2 Procedure for Sale. In the event the Company elects pursuant to this
Section 4.1 to purchase the Common Stock proposed to be sold by the  Transferor,
the closing of the  purchase  by the Company of the shares of such Common  Stock
held by the  Transferor  shall take place at the principal  place of business of
the Company no later than 30 days after the date such notice of election is made
in accordance with the terms hereof.



                                     28



<PAGE>









At the closing,  the Company  will pay the purchase  price for the shares to the
Transferor by wire transfer of immediately available funds upon the Transferor's
delivery to the Company of valid  certificates  evidencing  the shares of Common
Stock being  purchased  pursuant to such sale (the  "Transferor  Shares").  Such
certificates  will be duly  endorsed  for  transfer  to the  Company,  and  upon
delivery of such  certificates to the Company,  the Transferor will be deemed to
represent  and warrant to the Company  that the  Transferor  Shares are owned by
such  Transferor  free  and  clear  of all  liens,  adverse  claims,  and  other
encumbrances other than as provided in this Stockholders Agreement.

      4.1.3 Time to Purchase.  At any time pursuant to which the Company  elects
to  purchase  under  this  Section  4.1 the  shares  of Common  Stock  held by a
Transferor,  it shall have 30 days to arrange  financing  for and take any steps
necessary to comply with applicable law in order to consummate such purchase. If
the Company does not  consummate  such purchase  within such 30-day  period,  it
shall have no liability to any of the Holders as a result of such  failure,  but
all rights of the  Company  under this  Section  4.1 to  purchase  the shares of
Common Stock held by such  Transferor  shall  thereafter  terminate and be of no
further force or effect.

SECTION 4.2  Tag Along Rights.

      4.2.1  Applicability.  In the event (i) any member of the HMC Group or any
one of the Existing  Stockholders desires to effect a Transfer,  (ii) such party
has  offered its shares of Common  Stock to the Company  pursuant to Section 4.1
and (iii) the  Company has  determined  not to or has failed to  consummate  the
purchase of such party's shares of Common Stock,  then at least 30 days prior to
such Transfer,  the party or parties  desiring to effect the Transfer shall make
an offer  (the  "Participation  Offer")  to each  non-selling  Holder  (each,  a
"Co-Seller") to include in the proposed  Transfer a portion of such  Co-Seller's
Common  Stock  which   represents  the  same  percentage  of  such   Co-Seller's
Fully-Diluted  Common Stock as the shares proposed to be sold in the Transfer by
such member of the HMC Group or such Existing  Stockholder  (as the case may be,
the  "Tag  Seller  Group")   represent  of  the  Tag  Seller  Group's  aggregate
Fully-Diluted  Common Stock;  provided that, if a member of the HMC Group is the
Tag Seller Group and the  consideration to be received by such member of the HMC
Group  includes  any  securities,  only  Co-Sellers  who have  certified  to the
reasonable  satisfaction  of HMTF that they are  Accredited  Investors  shall be
entitled  to  participate  in such  Transfer,  unless  the  transferee  consents
otherwise.




                                     29



<PAGE>









      4.2.2 Terms of Participation Offer. The Participation Offer shall describe
the terms and conditions of the proposed  Transfer and shall be conditioned upon
(i) the consummation of the transactions contemplated in the Participation Offer
with the  transferee  named  therein,  and (ii) each  Co-Seller's  execution and
delivery of all  agreements  and other  documents that members of the Tag Seller
Group are  required  to execute  and deliver in  connection  with such  Transfer
(provided that the Co-Seller  shall not be required to make any  representations
or   warranties   in   connection   with  such  sale  or  transfer   other  than
representations  and warranties as to (A) such  Co-Seller's  ownership of his or
its Common Stock to be sold or transferred free and clear of all liens,  claims,
and  encumbrances,  (B) such  Co-Seller's  power and  authority  to effect  such
transfer and (C) such matters  pertaining to compliance  with securities laws as
the  transferee  may  reasonably  require).  If any  Co-Seller  shall accept the
Participation Offer, the Tag Seller Group shall reduce, to the extent necessary,
the  number  of  shares  of Common  Stock it  otherwise  would  have sold in the
proposed  transfer  so as to  permit  those  Co-Sellers  who have  accepted  the
Participation  Offer to sell the number of shares of Common  Stock that they are
entitled  to sell  under this  Section  4.2,  and the Tag Seller  Group and such
Co-Sellers  shall transfer the number of shares of Common Stock specified in the
Participation  Offer to the proposed  transferee in accordance with the terms of
such transfer as set forth in the Participation Offer.

SECTION 4.3  Certain Events Not Deemed Transfers.

      In no event shall any (i) exchange, reclassification,  or other conversion
of shares into any cash,  securities,  or other property pursuant to a merger or
consolidation  of the Company or any Subsidiary with, or any sale or transfer by
the Company or any  Subsidiary  of all or  substantially  all its assets to, any
Person, or (ii) statutory share exchange involving,  or recapitalization of, the
Company  or any  Subsidiary  in  which  holders  of  Common  Stock  are  treated
substantially  the same or (iii)  transfer by a Holder  pursuant to an effective
registration  statement  pursuant to Section 4.1 or Section 4.2 hereof,  or (iv)
transfer by a Holder pursuant to Rule 144 under the Securities Act, constitute a
Transfer of shares of Common Stock by the HMC Group or the Existing Stockholders
for purposes of Section 4.1 or Section  4.2. In  addition,  Sections 4.1 and 4.2
hereof shall not apply to any transfer, sale, or disposition of shares of Common
Stock solely among  members of (i) the HMC Group as a group or (ii) the Existing
Stockholders as a group.




                                     30



<PAGE>









SECTION 4.4  Transfer and Exchange.

      When  Securities  are  presented to the Company with a request to register
the transfer of such Securities or to exchange such Securities for Securities of
other authorized denominations,  the Company shall register the transfer or make
the exchange as requested if the requirements of this Stockholders Agreement for
such transaction are met; provided, however, that the Securities surrendered for
transfer  or  exchange  shall  be duly  endorsed  or  accompanied  by a  written
instrument  of transfer in form  reasonably  satisfactory  to the Company,  duly
executed by the Holder  thereof or its attorney and duly  authorized in writing.
No service  charge shall be made for any  registration  of transfer or exchange,
but the Company may require  payment of a sum  sufficient  to cover any transfer
tax or similar governmental charge payable in connection therewith.

SECTION 4.5  Replacement Securities.

      If a mutilated  Security is surrendered to the Company or if the Holder of
a Security  claims and submits an affidavit or other  evidence,  satisfactory to
the  Company,  to the  effect  that the  Security  has been lost,  destroyed  or
wrongfully  taken,  the  Company  shall  issue  a  replacement  Security  if the
Company's  requirements  are met. If required by the  Company,  such Holder must
provide  an  indemnity  bond,  or other  form of  indemnity,  sufficient  in the
judgment of the  Company to protect  the  Company  against any loss which may be
suffered.  The Company may charge such Holder for its  reasonable  out-of-pocket
expenses in replacing a Security which has been  mutilated,  lost,  destroyed or
wrongfully taken.

SECTION 4.6  Sale of the Company.

      If due to market  conditions  between Closing and the fifth anniversary of
Closing, the HMC Group shall not have successfully  completed,  on or before the
fifth  anniversary  of the Closing,  a sale of all of the shares of Common Stock
owned by HMTF/Omni at the Closing, then at any time after such fifth anniversary
until the sixth anniversary of the Closing,  the HMC Group may propose a sale of
the  Company  by  means of the sale of all or  substantially  all of the  equity
securities  of the  Company  or all or  substantially  all of the  assets of the
Company or in any manner  otherwise  advised (a "Company  Sale")  pursuant to an
auction  process  managed by an investment  banking firm of recognized  national
standing (an "Investment  Banker")  selected by HMTF. In the event of a proposal
for a Company  Sale,  each of the Holders  party hereto agrees that HMTF and the
Investment  Banker  shall be  entitled,  so long as they act in good  faith,  to
manage



                                     31



<PAGE>









exclusively  the sale process for such Company Sale and to take all such acts on
behalf of the  Holders  selling  in such  transaction  as they  deem  necessary,
appropriate or advisable. Each of the parties hereto further agrees to cooperate
in  good  faith  in  consummating  the  Company  Sale  and to  use  commercially
reasonable  efforts  to cause  to be done  all  things  that  are  necessary  or
appropriate  to  consummate  the Company  Sale as proposed  (including,  without
limitation,  the voting of any Common Stock or other voting capital stock of the
Company to approve such Company Sale).


                                   ARTICLE 5

                            LIMITATION ON TRANSFERS

SECTION 5.1  Restrictions on Transfer.

      The Securities shall not be Transferred or otherwise conveyed, assigned or
hypothecated before satisfaction of (i) the conditions specified in this Section
5.1 and Sections 5.2 and 5.3, which conditions are intended to ensure compliance
with the  provisions of the  Securities  Act with respect to the Transfer of any
Security and (ii) if  applicable,  Article 4 hereof.  Any purported  Transfer in
violation of this  Article 5 and/or,  if  applicable,  Article 4 hereof shall be
void ab initio and of no force or effect.  Other than (i)  Transfers  subject to
Section 4.1 hereof or (ii)  Transfers  to the public  pursuant  to an  effective
registration  statement  or sales to the public  pursuant  to Rule 144 under the
Securities Act or an effective  registration  statement,  each Holder will cause
any proposed  transferee  of any Security or any interest  therein held by it to
agree in writing to take and hold such securities  subject to the provisions and
upon the conditions specified in this Stockholders Agreement.

SECTION 5.2  Restrictive Legends.

      5.2.1 Securities Act Legend.  Except as otherwise  provided in Section 5.4
hereof,  each  Security  held by a  Holder,  and  each  Security  issued  to any
subsequent transferee of such Security,  shall be stamped or otherwise imprinted
with a legend in substantially the following form:

          THE  SECURITIES   REPRESENTED  BY  THIS   CERTIFICATE  HAVE  NOT  BEEN
          REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED,  NOR PURSUANT
          TO THE SECURITIES OR "BLUE SKY" LAWS OF ANY STATE. SUCH SECURITIES MAY
          NOT BE OFFERED, SOLD, TRANSFERRED,  PLEDGED, HYPOTHECATED OR OTHERWISE
          ASSIGNED,



                                     32



<PAGE>









          EXCEPT  PURSUANT TO (i) A REGISTRATION  STATEMENT WITH RESPECT TO SUCH
          SECURITIES WHICH IS EFFECTIVE UNDER SUCH ACT, (ii) RULE 144 UNDER SUCH
          ACT, OR (iii) ANY OTHER EXEMPTION FROM REGISTRATION UNDER SUCH ACT.

      5.2.2 Other Legends. Except as otherwise permitted by the last sentence of
Section 5.1,  each  Security  issued to each Holder or a  subsequent  transferee
shall include a legend in substantially the following form:

          THIS SECURITY IS SUBJECT TO RESTRICTIONS ON TRANSFER, VOTING AND OTHER
          TERMS AND CONDITIONS SET FORTH IN THE STOCKHOLDERS  AGREEMENT DATED AS
          OF APRIL 23,  1998,  A COPY OF WHICH MAY BE  OBTAINED  FROM  SPECIALTY
          TELECONSTRUCTORS, INC. AT ITS PRINCIPAL EXECUTIVE OFFICES.

SECTION 5.3  Notice of Proposed Transfers.

      Prior to any Transfer or attempted Transfer of any Security, the Holder of
such  Security  shall  (i) give ten days'  prior  written  notice  (a  "Transfer
Notice")  to the Company of such  Holder's  intention  to effect such  Transfer,
describing  the manner and  circumstances  of the  proposed  Transfer,  and (ii)
either (A)  provide to the  Company an opinion  reasonably  satisfactory  to the
Company from counsel to such Holder who shall be reasonably  satisfactory to the
Company (or supply such other evidence  reasonably  satisfactory to the Company)
that the proposed Transfer of such Security may be effected without registration
under the  Securities  Act, or (B)  certify in writing to the  Company  that the
Holder  reasonably  believes the sale meets all of the  conditions  set forth in
Rule 144A(d)  promulgated  under the Securities Act (and any successor rules and
regulations  thereto)  required  in order to effect a Transfer  pursuant to Rule
144A.  After  receipt of the  Transfer  Notice and  opinion (if  required),  the
Company shall,  within five days thereof,  so notify the Holder of such Security
and such  Holder  shall  thereupon  be entitled  to  Transfer  such  Security in
accordance  with the  terms of the  Transfer  Notice  subject  to such  Holder's
compliance  with the other  provisions  hereof.  Each Security  issued upon such
Transfer shall bear the restrictive legend set forth in Section 5.2.1, unless in
the  opinion of such  counsel  such  legend is not  required  in order to ensure
compliance with the Securities Act, and Section 5.2.2, if applicable. The Holder
of the  Security  giving the  Transfer  Notice shall not be entitled to Transfer
such  Security  until  receipt of the notice from the Company under this Section
5.3.




                                     33



<PAGE>









SECTION 5.4  Termination of Certain Restrictions.

      Notwithstanding  the  foregoing  provisions  of this  Article  5,  (i) the
restrictions  imposed by Section 5.1 upon the  transferability of the Securities
and the legend  requirements  of Sections 5.2.1 and 5.2.2 shall  terminate as to
any  Security  when and so long as such  Security  shall  have been  effectively
registered  under the Securities  Act and disposed of pursuant  thereto and (ii)
the legend  requirements of Section 5.2.1 shall terminate when the Company shall
have  received  an opinion of counsel  reasonably  satisfactory  to it that such
Security may be transferred  without  registration  thereof under the Securities
Act and that such legends may be removed.  Whenever the restrictions  imposed by
Sections  5.2.1 and/or  5.2.2 shall  terminate  as to any  Security,  the Holder
thereof shall be entitled to receive from the Company, at the Company's expense,
a new Security  not bearing the  restrictive  legend set forth in Section  5.2.1
and/or 5.2.2.


                                   ARTICLE 6

                             CERTAIN TRANSACTIONS

SECTION 6.1  Transactions Requiring Consent of the Designees.

      6.1.1 Majority Vote.  Without the  affirmative  vote of a majority of both
the HMTF Designees, on the one hand, and the Existing Stockholders Designees, on
the other hand,  (i) the Company shall not, and the Company shall not permit any
of its Subsidiaries to, enter into any of the following:

      (a) any acquisition of any other business or assets involving an aggregate
purchase price (including debt assumed) in excess of $5,000,000 (whether paid in
cash or securities);

      (b)  the  sale  or  other  disposition  (including  by  way  of a  merger,
consolidation, statutory share exchange, lease or sale/leaseback transaction) of
assets,  in any  one  transaction  or  series  of  related  transactions,  which
constitute  all or  substantially  all of the  assets  of the  Company  and  its
Subsidiaries  considered as a whole, other than to a wholly-owned  Subsidiary of
the Company;

      (c) any debt financing involving more than $10,000,000;

      (d) the  issuance  or sale of  shares  constituting  more  than 20% of the
voting  securities of the Company or any Subsidiary of the Company to any Person
or Group  (other than any  issuance  or sale to the Company or any  wholly-owned
Subsidiary of the



                                     34



<PAGE>









Company)  or the  issuance  or sale of any  shares  of  Preferred  Stock  of the
Company;

      (e) any  merger or  consolidation  or  business  combination  between  the
Company  or a  Subsidiary  and  any  other  entity  (other  than a  wholly-owned
Subsidiary of the Company), or any other  recapitalization  transaction or stock
repurchase or redemption, or any statutory share exchange;

      (f)  the  sale  or  other  disposition  (including  by  way  of a  merger,
consolidation, statutory share exchange, lease or sale/leaseback transaction) of
any operating division of the Company (whether or not incorporated as a separate
Subsidiary),  in any one  transaction or series of related  transactions,  other
than to a wholly-owned Subsidiary of the Company;

      (g)   any liquidation or dissolution of the Company;

      (h)  approval  of an annual  consolidated  budget for the  Company and its
Subsidiaries; or

      (i) the filing of a voluntary  petition under the  Bankruptcy  Code or any
state insolvency statute, the appointment of a receiver or trustee, or agreement
to the filing of an involuntary petition under the Bankruptcy Code.


                                   ARTICLE 7

                            AFFILIATE TRANSACTIONS

      The  Company  shall not enter into any  material  transaction  (including,
without  limitation,  agreements  which are standard in the  industry)  with any
director or  significant  stockholder  of the Company or any  Affiliate  thereof
unless such  transaction (a) has been approved by the  Independent  Directors in
accordance with the requirements of applicable law and (b) is on an arm's-length
basis on terms no less  favorable  to the  Company  than could be  obtained in a
transaction with an independent  third party.  This Article 7 shall not apply to
the  exercise  of the Option  (as  defined  therein)  pursuant  to that  certain
Management  and Option  Agreement,  dated the date  hereof,  among the  Company,
HSW/Omni Acquisition, Inc. and HMTF/Omni. Furthermore, notwithstanding the prior
provisions  of this  Article 7, the Company  shall not exercise its rights under
Section 4.1 hereof  without the consent of a majority of the  directors  who are
not  HMTF  Designees,  if the  HMC  Group  is the  Transferor,  or the  Existing
Stockholders Designees, if an Existing Stockholder is the Transferor.




                                     35



<PAGE>










                                   ARTICLE 8

                            STANDSTILL ARRANGEMENTS

SECTION 8.1  Share Ownership of HMTF Group.

      Except as set forth on Schedule A hereto,  the HMTF Group does not own any
Voting Securities.  As used in this Article 8, "HMTF Group" means (i) HMTF/Omni,
(ii) HMTF, (iii) Carl E. Hirsch, (iv) Anthony S. Ocepek and (v) Jerome C. Kline.

SECTION 8.2  Standstill Arrangements.

      8.2.1 Acquisition of Additional Voting Securities. Each member of the HMTF
Group  hereby  covenants  and  agrees  that  prior  to the  termination  of this
Stockholders  Agreement,  such member will not, directly or indirectly  (through
controlled  Affiliates  or  otherwise),  purchase  or cause to be  purchased  or
otherwise  acquire  (other than (i) pursuant to a stock split,  stock  dividend,
recapitalization,  reorganization  or similar  Company action  applicable to all
Company  stockholders  holding  the  security in respect of which such action is
taken or (ii) from another member of the HMTF Group in accordance with the terms
hereof)  or make any  proposal  to or agree to  acquire,  or  become or agree to
become the Beneficial Owner of, any Voting  Securities in addition to the Common
Stock such Person owns on the date hereof.

      8.2.2  Prohibited Actions.

            Each  member of the HMTF  Group  hereby  agrees  that,  prior to the
termination of this Stockholders  Agreement,  such member of the HMTF Group will
not, directly or indirectly,  solicit,  request,  advise, or encourage others to
take any of the following actions (collectively, the "Prohibited Actions"):

      (a)  form,  join in or in any  other way  participate  in a  "partnership,
limited  partnership,  syndicate or other  group"  within the meaning of Section
13(d)(3) of the Exchange Act with  respect to Voting  Securities  or deposit any
Voting Securities in a voting trust or similar arrangement or subject any Voting
Securities  to any voting  agreement or pooling  arrangement,  other than solely
with one or more  Affiliates of HMTF/Omni with respect to the Common Stock owned
on the date hereof or pursuant to this Stockholders Agreement;

      (b) solicit proxies or written  consents of  stockholders  with respect to
Voting  Securities under any  circumstances,  or make any  "solicitation" of any
"proxy" to vote any Voting Securities, or become a "participant" in any election
contest



                                     36



<PAGE>









with  respect to the  Company  (as such terms are defined or used in Rules 14a-1
and 14a-11  under the Exchange  Act) or seek to advise or  influence  any Person
with respect to the voting of any Voting Securities;

      (c) seek to call,  or to  request  the call of, a special  meeting  of the
stockholders of the Company or seek to make, or make, a stockholder  proposal at
any meeting of the  stockholders  of the  Company  with the purpose or intent of
affecting control of the Company;

      (d) commence, or announce any intention to commence,  any tender offer for
any Voting Securities;

      (e) publicly make a proposal or bid with respect to, or announce  publicly
any  intention  or desire to make any  proposal or bid with  respect to, (i) the
acquisition of all or  substantially  all of the assets of the Company or of the
assets  or  stock of any of its  Subsidiaries  or of all or any  portion  of the
outstanding  Voting  Securities,  or (ii) any merger,  consolidation,  statutory
share exchange,  other business  combination,  restructuring,  recapitalization,
liquidation or other extraordinary  transaction  involving the Company or any of
its Subsidiaries;

      (f)  act to  seek  control  of the  Board  of  Directors  of the  Company;
provided, however, that (1) this clause shall not be interpreted to preclude any
director  designated by HMTF from exercising such  director's  fiduciary  duties
under  applicable  law and (2) no member of the HMTF Group shall be in violation
of this  Section  8.2.2 as a result of  exercising  or  enforcing  or seeking to
enforce such member's rights pursuant to this Agreement;

      (g) initiate  any action,  suit or  proceeding  against the Company or any
Subsidiary  of the  Company,  the  Board of  Directors  of the  Company,  or the
officers of the Company in their capacity as such, other than an action, suit or
proceeding  to enforce  the rights of the  members of the HMTF Group  under this
Agreement;

      (h)  arrange,  or in  any  way  participate  in,  any  financing  for  any
transaction referred to in Section 8.2.2(a) through (g) above; or

      (i) make public,  directly or  indirectly  (including by disclosure to any
journalist or other  representative of the media): (i) any request, or otherwise
seek (in any  fashion  that would  require  public  disclosure  by the  Company,
HMTF/Omni or their  respective  Affiliates) to obtain any waiver or amendment of
any  provision of this Article 8 or (ii) the taking of any action  restricted by
this Article 8.



                                     37



<PAGE>










      8.2.3  Exclusions  from  the  Standstill   Arrangements.   Notwithstanding
anything in this  Stockholders  Agreement  to the contrary  (including  Sections
8.2.1 and 8.2.2 hereof),  nothing in this Stockholders  Agreement shall prohibit
(a)  purchases  of  Voting  Securities  that do not  result  in the  HMTF  Group
Beneficially   Owning  Voting  Securities  that  possess,  as  of  the  time  of
determination,  in excess of 49.9% (as calculated  with respect to  convertible,
exchangeable  or  exercisable  securities  of the  Company by  reference  to the
maximum  number of votes to which a holder of such  security is entitled to cast
in either a converted or unconverted,  exchanged or unexchanged, or exercised or
unexercised  basis, as the case may be,  currently or at any time in the future)
of the total  number of votes (the "Total  Voting  Power") that could be cast in
the election of directors of the Company at such time,  (b)  purchases of Voting
Securities  or the  taking of  Prohibited  Actions  that  have  been  previously
approved in writing by the Company as  specifically  expressed in a vote adopted
by the Board of Directors  of the Company or, after the date hereof,  previously
approved in writing by the Company as  specifically  expressed in a vote adopted
by a majority of the directors of the Company that are not HMTF  Designees,  (c)
any member of the HMTF Group's compliance with the applicable  provisions of the
Securities  Act and the Exchange Act and the rules and  regulations  promulgated
thereunder,  and (d) the  exercise  by a member of the HMTF  Group of its rights
pursuant to this Stockholders Agreement.

      8.2.4  Notification  of the Company.  Each member of the HMTF Group hereby
covenants and agrees that such Person will promptly  notify the Company when and
if such Person receives any oral or written request of such Person or any of its
Affiliates to participate in any of the  transactions or actions  referred to in
Sections 8.2.2(a) through (i).

      8.2.5 Rights of HMTF Group.  Notwithstanding  any other  provision of this
Article 8, (a) no member of the HMTF Group shall be in violation of this Article
8 by virtue of the fact that such Person  approached  the Board of  Directors of
the Company,  or any member  thereof,  with  respect to any action  addressed in
Section 8.2.2 of this Article 8. Further,  nothing  contained in this Article 8,
express or  implied,  shall be  construed  to prevent any member of the Board of
Directors of the Company from  complying  with any  fiduciary or other duties or
obligations such party may have to the Company's stockholders.  Furthermore, the
prohibitions  set forth in Sections 8.2.1 and 8.2.2 shall not apply in the event
that the Company  receives a Third  Party Offer that a majority of the  Existing
Stockholder  Designees sitting on the Board of Directors has not rejected within
twenty Business Days following receipt thereof. As used



                                     38



<PAGE>









in this  Stockholders  Agreement,  "Third Party Offer" shall mean a noncollusive
bona fide  proposal  or offer  from any  Person  other than a member of the HMTF
Group or an Affiliate thereof relating to the direct or indirect  acquisition or
purchase  of  material  operating  assets or Voting  Securities  by way of sale,
merger,   consolidation,   business   combination,   liquidation,   dissolution,
recapitalization  or any similar  transaction for a specified  consideration  or
consideration within a specified range.


                                   ARTICLE 9

                                  TERMINATION

      The provisions of this Agreement  shall  terminate on the earlier of April
23, 2008 or the sale  contemplated  by Section  4.6.  Notwithstanding  the prior
sentence,  the provisions of Section 3.7 hereof shall survive the termination of
this Agreement  indefinitely.  In addition, the provisions of Section 4.1 hereof
shall  terminate when either of the Existing  Stockholders,  on the one hand, or
the HMC Group, on the other hand,  Beneficially  Own less than 10% of the number
of shares of Common Stock issued and  outstanding on the date of  determination.
The  provisions  of  Section  4.6  hereof  shall  terminate  when the HMC  Group
Beneficially  Owns less than 50% of the number of shares of Common  Stock issued
on the Closing Date.


                                  ARTICLE 10

                                 MISCELLANEOUS

SECTION 10.1  Notices.

      Any notices or other communications  required or permitted hereunder shall
be in writing,  and shall be  sufficiently  given if made by hand  delivery,  by
telex, by telecopier or registered or certified mail,  postage  prepaid,  return
receipt  requested,  addressed  as follows  (or at such other  address as may be
substituted by notice given as herein provided):




                                     39



<PAGE>









      If to the Company:

            Specialty Teleconstructors, Inc.
            12001 State Highway 14 North
            Cedar Crest, New Mexico  87008
            Telecopy:  (505) 281-8652
            Attn:  President

      Copies to:

            Haynes and Boone, LLP
            901 Main Street, Suite 3100
            Dallas, Texas  75202-3789
            Telecopy:  (214) 651-5940
            Attn:  Gregory R. Samuel

            Hicks, Muse, Tate & Furst Incorporated
            200 Crescent Court, Suite 1600
            Dallas, Texas  75201
            Telecopy:  (214) 740-7313
            Attn:  Lawrence D. Stuart, Jr.

            Weil, Gotshal & Manges LLP
            100 Crescent Court, Suite 1300
            Dallas, Texas  75201-6950
            Telecopy:  (214) 746-7777
            Attn:  Mary R. Korby, Esq.

      If to any Holder, at its address listed on the signature pages hereof, and
      in the case of any notices required under Article 4 to be sent to a Holder
      who is an Existing Stockholder, a copy shall be sent to Gregory R. Samuel,
      Haynes & Boone, LLP, 901 Main Street, Suite 3100, Dallas, Texas 75202-3789
      (Fax (214) 651-5940).

      Any notice or  communication  hereunder shall be deemed to have been given
or made as of the date so delivered if personally delivered; when answered back,
if telexed; when receipt is acknowledged,  if telecopied; and five calendar days
after mailing if sent by  registered or certified  mail (except that a notice of
change of address shall not be deemed to have been given until actually received
by the addressee).

      Failure to mail a notice or  communication to a Holder or any defect in it
shall not affect its sufficiency  with respect to other Holders.  If a notice or
communication is mailed in the manner provided above, it is duly given,  whether
or not the addressee receives it.



                                     40



<PAGE>










SECTION 10.2  Entire Agreement.

      This  Stockholders  Agreement  (together  with any  schedules  or exhibits
hereto) sets forth the entire agreement and  understanding of the parties hereto
with respect to the transactions  contemplated  hereby, and supersedes all other
prior agreements,  arrangements and understandings related to the subject matter
hereof (including without limitation any demand or piggyback registration rights
granted to  Carpenter).  No  understanding,  promise,  inducement,  statement of
intention,  representation,  warranty,  covenant or condition,  written or oral,
express or implied,  whether by statute or otherwise, has been made by any party
hereto with respect to the subject  matter  hereof which is not embodied in this
Stockholders Agreement,  and no party hereto shall be bound by or liable for any
alleged understanding, promise, inducement, statement, representation, warranty,
covenant  or  condition  not so set forth  with  respect to the  subject  matter
hereof.

SECTION 10.3  Governing Law; Jurisdiction.

      THIS  STOCKHOLDERS  AGREEMENT  SHALL  BE  GOVERNED  BY  AND  CONSTRUED  IN
ACCORDANCE WITH THE LAWS OF THE STATE OF TEXAS,  WITHOUT REGARD TO PRINCIPLES OF
CONFLICTS OF LAW.

SECTION 10.4  Successors and Assigns.

      Whether  or not an  express  assignment  has  been  made  pursuant  to the
provisions  of this  Stockholders  Agreement,  provisions  of this  Stockholders
Agreement that are for the Holders' benefit as the holders of any Securities are
also  for the  benefit  of,  and  enforceable  by,  all  subsequent  holders  of
Securities,  except as otherwise  expressly  provided herein.  This Stockholders
Agreement shall be binding upon the Company,  each Holder,  and their respective
heirs, devisees, successors and assigns.

SECTION 10.5  Duplicate Originals.

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

SECTION 10.6  Severability.

      In  case  any  provision  in this  Stockholders  Agreement  shall  be held
invalid,  illegal or unenforceable in any respect for any reason,  the validity,
legality and enforceability of any such provision in every other respect and the
remaining provisions shall not in any way be affected or impaired thereby.



                                     41



<PAGE>










SECTION 10.7  No Waivers; Amendments.

      10.7.1 No  failure  or delay on the part of the  Company  or any Holder in
exercising  any  right,  power or remedy  hereunder  shall  operate  as a waiver
thereof,  nor shall any single or partial  exercise of any such right,  power or
remedy  preclude  any other or further  exercise  thereof or the exercise of any
other right,  power or remedy.  The remedies  provided for herein are cumulative
and are not  exclusive of any  remedies  that may be available to the Company or
any Holder at law or in equity or otherwise.

      10.7.2 Any  provision  of this  Stockholders  Agreement  may be amended or
waived if, but only if, such  amendment or waiver is in writing and is signed by
the Company and the Required Holders; provided, that no such amendment or waiver
shall, (i) unless signed by all of the Holders,  amend the provisions of Section
2 or any  definition  used  herein,  (ii)  unless  signed by all of the  Holders
affected, (A) amend the provisions of this Section 10.7.2 or any definition used
therein or (B) change the number of  Holders  which  shall be  required  for the
Holders or any of them to take any action under this Section 10.7.2 or any other
provision of this Stockholders  Agreement and (iii) unless signed by Holders who
then  Beneficially Own more than 85% of the aggregate number of shares of Common
Stock subject to this Stockholders  Agreement,  amend the provisions of Sections
4.1,  4.2,  5.1 or 8.  Furthermore,  unless  signed  by a  majority  of the HMTF
Designees,  on the one hand,  and the Existing  Stockholders  Designees,  on the
other hand, no amendment  shall be effective as to Section 6.1 or any definition
used therein, and each Holder, on behalf of itself and such Holder's transferees
hereunder, delegates to such Persons the right to so amend such provision.

SECTION 10.8  Actions of Existing Stockholders.

      Any  action  required  to be taken or right  which is  exercisable  by the
Existing Stockholders hereunder,  other than pursuant to Section 3.1.1.(a),  may
be taken by  Budagher  in his sole and  absolute  discretion  on  behalf  of all
Existing Stockholders,  and Budagher shall have no liability to Carpenter or any
other Person with respect to any such action or any such right exercised.

SECTION 10.9  Nominees for Beneficial Owners.

      In the event that any  Registrable  Shares  are held by a nominee  for the
beneficial  owner thereof,  the beneficial owner thereof may, at its election in
writing  delivered to the Company,  be treated as the Holder of such Registrable
Shares for purposes



                                     42



<PAGE>









of any request or other  action by any Holder or Holders of  Registrable  Shares
pursuant to this  Stockholders  Agreement or any  determination of any number or
percentage of  Registrable  Shares held by any Holder or Holders of  Registrable
Shares contemplated by this Stockholders  Agreement.  If the beneficial owner of
any Registrable Shares so elects, the Company may require assurances  reasonably
satisfactory  to it of such owner's  beneficial  ownership  of such  Registrable
Shares.

SECTION 10.10  Calculation of Percentage Interests in Registrable Shares.

      For  purposes  of  this  Stockholders  Agreement,   all  references  to  a
percentage of the Registrable  Shares shall be calculated  based upon the number
of shares of  Registrable  Shares  outstanding  at the time such  calculation is
made.




                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]



                                       43



<PAGE>









                      SIGNATURES TO STOCKHOLDERS AGREEMENT

      IN WITNESS  WHEREOF,  the parties  hereto  have  caused this  Stockholders
Agreement to be duly executed, all as of the date first written above.

                        SPECIALTY TELECONSTRUCTORS, INC.


                        By:   /s/ Michael R. Budagher
                           -----------------------------
                              Michael R. Budagher
                              President






<PAGE>









                      SIGNATURES TO STOCKHOLDERS AGREEMENT



                  NAME OF HOLDER:

                  HMTF/OMNI PARTNERS, L.P.

                  By:   HM3/OmniAmerica Partners, LLC, its General
                        Partner

                           /s/ Daniel S. Dross
                        ---------------------------------------
                        Daniel S. Dross
                        Vice President, Secretary and Treasurer


                              Address:    c/o Hicks, Muse, Tate & Furst
                                          Incorporated
                                          200 Crescent Court
                                          Suite 1600
                                          Dallas, Texas 75201
                                          Fax: 214-740-7313
                                          Attention:  Lawrence D.
                                          Stuart, Jr.


<PAGE>









                     SIGNATURES TO STOCKHOLDERS AGREEMENT


                              NAME OF HOLDER:


                                 /s/ Michael R. Budagher
                              ----------------------------
                              MICHAEL R. BUDAGHER




                              Address:    3702 Holland Ave., #2
                                          Dallas, Texas  75219


                              BUDAGHER FAMILY, LLC



                              By:     /s/ Michael R. Budagher
                                 ---------------------------------
                                  Michael R. Budagher, general manager


<PAGE>









                     SIGNATURES TO STOCKHOLDERS AGREEMENT


                                    NAME OF HOLDER:


                                       /s/ Tommie R. Carpenter
                                    ----------------------------
                                    TOMMIE R. CARPENTER



                                    Address:    2260 Canyon Song Ave.
                                                Laughlin, Nevada   89029

                                    Mailing
                                    Address:    P.O. Box 30869
                                                Laughlin, Nevada  89028




<PAGE>










                     SIGNATURES TO STOCKHOLDERS AGREEMENT




                                    NAME OF HOLDER:

                                    HICKS, MUSE, TATE & FURST INCORPORATED


                                       /s/ Daniel S. Dross
                                    --------------------------
                                    Daniel S. Dross
                                    Senior Vice President


                                    Address:    c/o Hicks, Muse, Tate &
                                                Furst Incorporated
                                                200 Crescent Court
                                                Suite 1600
                                                Dallas, Texas 75201
                                                Fax: 214-740-7313
                                                Attention:  Lawrence D.
                                                Stuart, Jr.


<PAGE>










                     SIGNATURES TO STOCKHOLDERS AGREEMENT



                                    NAME OF HOLDER:


                                       /s/ Jerome C. Kline
                                    ---------------------------
                                    JEROME C. KLINE


                                    Address:    360 Alexander Circle
                                                Columbia, SC 29206




<PAGE>










                     SIGNATURES TO STOCKHOLDERS AGREEMENT



                                    NAME OF HOLDER:


                                       /s/ Anthony S. Ocepek
                                    ----------------------------
                                    ANTHONY S. OCEPEK


                                    Address:    2335 S. Ocean Blvd.
                                                Palm Beach, FL  33480




<PAGE>









                     SIGNATURES TO STOCKHOLDERS AGREEMENT



                                    NAME OF HOLDER:


                                        /s/ Carl E. Hirsch
                                    -----------------------------
                                    CARL E. HIRSCH


                                    Address:    3100 S. Ocean Blvd.
                                                Palm Beach, FL  33480




<PAGE>








                                  SCHEDULE A


Carl E. Hirsch -- 17,000 shares


                                                                   Exhibit 99(c)


                            JOINT FILING AGREEMENT

         The  undersigned,  and each of them, do hereby agree and consent to the
filing  of a single  statement  on  behalf  of all of them on  Schedule  13D and
amendments  thereto, in accordance with the provisions of Rule 13d-1(f)(1) under
the Securities Exchange Act of 1934, as amended.

                               THOMAS O. HICKS

                               By:          *
                                  ------------------------------
Dated: May 4, 1998             Name: Lawrence D. Stuart, Jr.
                               Title: Attorney-in-Fact


                               HICKS, MUSE FUND III INCORPORATED

                               By:          *
                                  ------------------------------
                               Name: Lawrence D. Stuart, Jr.
                               Title: Executive Vice President


                               HICKS, MUSE GP PARTNERS III, L.P.

                               By:   HICKS, MUSE FUND III INCORPORATED,
                                      its general partner

                                     By:          *
                                        ------------------------
                                     Name: Lawrence D. Stuart, Jr.
                                     Title: Executive Vice President


                               HM3 COINVESTORS, L.P.

                               By:   HICKS, MUSE GP PARTNERS III, L.P.,
                                       its general partner

                                     By:   HICKS, MUSE FUND III INCORPORATED,
                                            its general partner
     
                                           By:          *
                                              -------------------------
                                           Name: Lawrence D. Stuart, Jr.
                                           Title: Executive Vice President


                               HM3/OMNIAMERICA PARTNERS, LLC

                               By:          *
                                  ------------------------------
                               Name: Lawrence D. Stuart, Jr.
                               Title: President


                               HMTF/OMNI PARTNERS, L.P.

                               By:   HM3/OMNIAMERICA PARTNERS, LLC,
                                      its general partner

                                      By:           *
                                         ---------------------------
                                      Name: Lawrence D. Stuart, Jr.
                                      Title: President


                    
                                   /s/  Lawrence D. Stuart, Jr.
                               -------------------------------------
                               Lawrence D. Stuart, Jr.

                               * Signing on behalf of the above listed  persons,
                                 in the respective capacities indicated above.



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