Document:

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                                                                   Exhibit 10.26

                      SECOND AMENDMENT TO CREDIT AGREEMENT

         This SECOND AMENDMENT TO CREDIT AGREEMENT (this "Amendment") is entered
into as of December 22, 1999, by and among SpectraSite  Communications,  Inc., a
Delaware corporation (the "Borrower"),  SpectraSite  Holdings,  Inc., a Delaware
corporation ("Holdco"),  CIBC World Markets Corp. (f/k/a CIBC Oppenheimer Corp.)
and Credit Suisse First Boston,  as arrangers (the  "Arrangers"),  Credit Suisse
First Boston, as syndication agent (the "Syndication Agent"),  Canadian Imperial
Bank of Commerce, as administrative agent (the "Administrative Agent"), Canadian
Imperial Bank of Commerce,  as collateral agent (the "Collateral Agent") and the
other Credit Parties signatory hereto (the "Credit Parties").

                              W I T N E S S E T H:

         WHEREAS,  the Borrower,  Holdco, the Arrangers,  the Syndication Agent,
the  Administrative  Agent,  the  Collateral  Agent and the Credit  Parties  are
parties to that certain Credit  Agreement dated as of April 20, 1999, as amended
by that certain First Amendment to Credit  Agreement dated as of August 23, 1999
(as the  same  may be  further  amended,  restated,  supplemented  or  otherwise
modified from time to time, the "Credit Agreement"); and

         WHEREAS, the Borrower and Holdco have requested, and the Arrangers, the
Syndication Agent, the Administrative Agent, the Collateral Agent and the Credit
Parties  have  agreed,  to amend the Credit  Agreement  as and to the extent set
forth  herein  and to waive  an  Event of  Default  existing  under  the  Credit
Agreement;

         NOW THEREFORE,  in  consideration  of the premises set forth above, the
terms and conditions contained herein and other good and valuable consideration,
the receipt and sufficiency of which are hereby acknowledged, the parties hereby
agree that all  capitalized  terms used herein shall have the meanings  ascribed
thereto in the Credit Agreement,  as amended hereby, except as otherwise defined
or limited  herein,  and further agree,  subject to the conditions  precedent to
this Amendment hereinafter set forth, as follows:

1.     Amendments to Article 1.

(a)ab Article 1 of the Credit  Agreement,  Definitions,  is hereby  modified and
amended by adding the  following  new  definitions  to be placed in  appropriate
alphabetical order:

                  "`Apex' shall mean Apex Site Management Holdings, Inc., a
Delaware corporation.

                  "`Apex  Acquisition'  shall  mean the  Acquisition  of Apex by
         Holdco  pursuant to the terms and  conditions  of the Apex  Acquisition
         Documents and the subsequent

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         transfer by Holdco to the Borrower of all of the issued and outstanding
         Capital Stock of Apex.

                  "`Apex  Acquisition  Documents' shall mean that certain Merger
         Agreement and Plan of Reorganization  dated as of November 24, 1999, as
         amended,  between the Borrower and Apex, and all schedules and exhibits
         thereto and documents executed in connection therewith.

                  "`Available  Cash' shall mean, on any  calculation  date,  the
         greater of (a) the amount of cash and cash  equivalents  on hand of the
         Borrower and its Subsidiaries minus $20,000,000, and (b) zero.

                  "`DigiPH' shall mean DigiPH PCS, Inc., an Alabama corporation.

                  "`DigiPH  Acquisition'  shall  mean  the  Acquisition  by  the
         Borrower of certain leases,  towers and related  facilities from DigiPH
         in conjunction with up to ninety-four (94) sites, and the related lease
         to DigiPH, under a master lease agreement,  of space on such towers and
         ground space on the land in the vicinity of such towers pursuant to the
         terms and conditions of the DigiPH Purchase Documents.

                  "DigiPH  Purchase  Documents'  shall mean that  certain  Asset
         Purchase  Agreement  dated as of November 5, 1999, as amended,  between
         the Borrower and DigiPH,  and all  schedules  and exhibits  thereto and
         documents executed in connection therewith.

                  "`Pre-Approved  Transactions'  shall mean,  collectively,  the
         Apex Acquisition,  the DigiPH Acquisition, the UbiquiTel Investment and
         the Acquisitions described in Section 8.5(xiii) hereof.

                  "`Pre-Approved     Transaction    Documents'    shall    mean,
         collectively,   the  Westower  Merger  Agreement,  the  NTA  Investment
         Documents,  the Apex Acquisition Documents,  DigiPH Purchase Documents,
         the UbiquiTel  Investment  Documents and the documents  relating to the
         Acquisitions  described  in Section  8.5(xiii)  hereof  (including  all
         schedules and exhibits thereto).

                  "`Second Amendment Date' shall mean December 22, 1999.

                  "`UbiquiTel' shall mean UbiquiTel Holdings, Inc., a Delaware
         corporation.

                  "`UbiquiTel  Investment"  shall  mean  the  Investment  by the
         Borrower  in  UbequiTel  pursuant  to the terms and  conditions  of the
         UbiquiTel Investment Documents in exchange for approximately twenty-six
         percent (26%) of the issued and outstanding equity of UbiquiTel.

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                  "`UbiquiTel  Investment  Documents'  shall  mean that  certain
         Series A Preferred  Stock Purchase  Agreement  dated as of November 23,
         1999,  as amended,  among the  Borrower,  UbiquiTel  and certain  other
         parties,  and all schedules and exhibits thereto and documents executed
         in connection therewith."

(b) Article 1 of the Credit Agreement, Definitions, is hereby further modified
and amended by deleting the existing definition of "Equity Offering".

(c) Article 1 of the Credit Agreement, Definitions, is hereby further modified
and amended by deleting  the  existing  definition  of  "Leverage  Ratio" and by
substituting the following in lieu thereof:

                  "`Leverage  Ratio' shall mean, on any  calculation  date,  the
         ratio  of (a)  Borrower  Debt,  to  (b)  Annualized  EBITDA;  provided,
         however, that at all times prior to the first anniversary of the Second
         Amendment Date, for purposes of determining  the Borrower's  compliance
         with Section 9.1 hereof (and not affecting the calculation of any other
         Financial  Covenant  or  the  determination  of the  Applicable  Margin
         pursuant to Section  2.3(g)  hereof),  "Leverage  Ratio" shall mean the
         ratio of (i) the greater of (A) (I) Borrower Debt, minus (II) Available
         Cash, and (B) zero, to (b) Annualized EBITDA."

2. Amendment to Section 2.1. Section 2.1 of the Credit  Agreement,  The Loans,
is hereby  modified and amended by deleting the first  sentence from  subsection
(f) and by substituting the following in lieu thereof:

                  "The  proceeds  of the Loans  shall be used (i) to finance the
         Nextel  Acquisition,   (ii)  to  finance  Permitted   Acquisitions  and
         Permitted  Investments,  (iii) to provide funding for the  acquisition,
         construction/development,  management and build-out of Towers and Tower
         Sites,  (iv)  for  general  corporate  purposes   (including,   without
         limitation,  fees and expenses relating to the Nextel Acquisition,  any
         Permitted   Acquisitions   and  any  Permitted   Investments   and  the
         transactions   contemplated  by  this  Agreement  and  the  other  Loan
         Documents),  and (v) for working  capital and other  general  corporate
         purposes."

3. Amendment to Section 2.7.  Section 2.7 of the Credit  Agreement,  Mandatory
Repayments,  is hereby modified and amended by deleting in its entirety existing
subsection (c) and by substituting the following in lieu thereof:

                  "(c) Debt Issuance. If, after the Agreement Date, Holdco shall
         conduct  any  public or  private  issuance  of any  Funded  Debt or any
         Convertible  Securities  (other  than the  issuance  of the Holdco 2009
         Notes  in  an  amount  not  to  exceed   $340,003,656)  (each  a  "Debt
         Offering"),  and the  Leverage  Ratio on a pro forma basis after giving
         effect to such Debt  Offering  shall be greater than 4.00 to 1.00,  the
         Borrower  shall  apply,  on the date of receipt of the Net  Proceeds of
         such Debt Offering by Holdco,  up to one hundred  percent (100%) of the
         Net Proceeds received by Holdco

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         with respect to such Debt Offering, to prepay the Senior Loans as set
         forth in Section 2.7(e)  hereof,  to the extent  necessary to cause the
         Leverage  Ratio to be less than or equal to 4.00 to 1.00 after giving
         effect to such Debt Offering."

4. Section 5.1(h) of the Credit Agreement, Title to Assets, is hereby modified
and amended by deleting the last  sentence  therefrom  and by  substituting  the
following in lieu thereof:

         "Tower Sub does not own any  material  Assets  other than Tower  Assets
         comprising the Nextel  Collateral and Tower Space Lease Agreements with
         Co-Locators on Towers comprising the Nextel Collateral, and Holdco does
         not own any  material  Assets  other than (i) the Capital  Stock of the
         Borrower,  (ii) the  Capital  Stock of any shell  Subsidiary  formed by
         Holdco   solely  for  the  purpose  of   consummating   any   Permitted
         Acquisition,   and  (iii)  on  the  closing   date  of  any   Permitted
         Acquisition,  the  Capital  Stock of any  target  company  acquired  in
         connection  with such Permitted  Acquisition  immediately  prior to the
         contribution of such Capital Stock to the Borrower."

5. Amendment to Section 6.2.  Section 6.2 of the Credit  Agreement,  Business;
Compliance with Applicable Law, is hereby amended by deleting the first sentence
therefrom and substituting the following in lieu thereof:

                   The Borrower  will,  and will cause each of its  Subsidiaries
         to,  engage solely in the business of the Tower  Operations,  the Other
         Operations  and in related  business  activities.  Holdco  will  engage
         solely  in the  business  of  holding  the  Capital  Stock  of (a)  the
         Borrower,  (b) any shell  Subsidiary  formed by Holdco  solely  for the
         purpose of  consummating  any Permitted  Acquisition,  and (iii) on the
         closing date of any Permitted Acquisition,  any target company acquired
         in connection with such Permitted Acquisition  immediately prior to the
         contribution of such Capital Stock to the Borrower."

6.  Amendment  to Section  6.9.  Section 6.9 of the Credit  Agreement,  Use of
Proceeds,  is hereby  amended by deleting the first  sentence  therefrom  and by
substituting the following in lieu thereof:

                   The Borrower will use the aggregate  proceeds of all Advances
         (a)  to  finance  the  Nextel  Acquisition,  (b) to  finance  Permitted
         Acquisitions and Permitted Investments,  (c) to provide funding for the
         acquisition,   construction/development  and  build-out  of  Towers  as
         permitted  hereunder,  (d) for general corporate  purposes  (including,
         without   limitation,   fees  and  expenses   relating  to  the  Nextel
         Acquisition,  any Permitted Acquisitions and any Permitted Investments,
         and the transactions  contemplated by this Agreement and the other Loan
         Documents),  and (e) for working  capital and other  general  corporate
         purposes."
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7.  Amendment to Section  7.1.  Section 7.1 of the Credit  Agreement,  Monthly
Financial  Statements  and  Information,  is  hereby  amended  by  deleting  the
reference  to  "thirty  (30)  days"  contained  therein  and by  replacing  such
reference with "forty-five (45) days".

8. Amendment to Section 8.4.  Section 8.4 of the Credit  Agreement,  Amendment
and Waiver,  is hereby deleted in its entirety and the following  substituted in
lieu thereof:

                  Section  8.4 Amendment  and  Waiver .  Neither  Holdco nor the
         Borrower shall,  and the Borrower shall cause each of its  Subsidiaries
         not to, without the prior written consent of the Arrangers,  enter into
         any  amendment  of, or agree to or accept any waiver  of,  which  would
         materially  adversely  affect the rights of the Borrower and the Credit
         Parties,  under  any of  them,  of any of the  provisions  of,  (a) its
         organizational   documents,    including,   without   limitation,   its
         certificate  or articles of  incorporation  (other than any increase in
         the  number  of  authorized   shares)  and  by-laws,   (b)  the  Nextel
         Acquisition  Documents,  (c)  the  Indentures,  (d) the  Holdco  Equity
         Documents, and (f) the Pre-Approved Transaction Documents."

9.     Amendments to Section 8.5.

(a) Section 8.5 of the Credit Agreement,  Liquidation;  Merger; Acquisition or
Disposition  of Assets,  is hereby  modified  and amended by  deleting  existing
subsection (vii) and substituting the following in lieu thereof:

                  "(vii)  subject to  compliance  with  Section 6.10 and Section
         6.16 hereof,  the Borrower and its Subsidiaries  (other than Tower Sub)
         may make  Acquisitions  and  Investments  (including the acquisition of
         Capital  Stock  or  other  equity   interests  in  Persons  engaged  in
         businesses  similar to the Tower Operations) and form Subsidiaries with
         respect thereto, subject to the following conditions:

                           "(A)     no  Default  or Event of  Default  shall
then  exist  before  or after  giving  effect to any such Acquisition or
Investment;

                           "(B)  the  Purchase   Price  with  respect  any  such
                  Acquisition  or  Investment  shall be (I)  payable  solely  in
                  common stock of Holdco, or (II) payable in cash so long as (x)
                  the cash  portion of the  Purchase  Price with  respect to any
                  single  Acquisition  or  Investment  (with respect to a single
                  transaction  or a series of  related  transactions)  shall not
                  exceed $50,000,000,  and (y) the aggregate cash portion of the
                  Purchase Price for  Acquisitions  and Investments  consummated
                  pursuant to this clause (vii) (other than the  Acquisition  of
                  the Future  Nextel  Towers)  during the period from the Second
                  Amendment Date through the Tranche B Maturity Date,  shall not
                  exceed $200,000,000;

                           "(C) with respect to Acquisitions structured as Tower
                  Asset  exchanges or swaps,  the following  restrictions  shall
                  apply:   (x)  the  cash  outlay

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                  by  the   Borrower  for  such Acquisition must be within the
                  dollar limitations set forth in the   preceding   clause  (B);
                  (y)  the   Annualized   EBITDA attributable  to the  Tower
                  Assets  being  acquired  must  be substantially similar to or
                  greater than the Annualized EBITDA of the Tower Assets being
                  exchanged or swapped; and (z) if the exchange  involves  more
                  than  twenty-five  (25)  Towers,  the Towers  acquired  in
                  such  transaction  must have as an anchor tenant a Nextel
                  Tenant or another tenant reasonably acceptable to the Majority
                  Lenders.

                           "(D) the Borrower  shall provide to the Arrangers and
                  the Lenders  calculations  demonstrating  pro forma compliance
                  with the  Financial  Covenants  after  giving  effect  to such
                  Acquisition or Investment; and

                           "(E)  with  respect  to  any  Acquisition  having  an
                  aggregate Purchase Price (with respect to a single transaction
                  or a series of related transactions) in excess of $20,000,000,
                  the Borrower  shall  provide to the  Arrangers and the Lenders
                  revised Projections  assuming  consummation of the Acquisition
                  and  demonstrating  pro forma  compliance  with the  Financial
                  Covenants through the Tranche B Maturity Date;"

(b) Section 8.5 of the Credit Agreement,  Liquidation;  Merger; Acquisition or
Disposition  of Assets,  is hereby  further  modified  and amended by adding the
following new subsections (xii) and (xiii) at the end thereof:

                  "(xii) so long as no Default or Event of Default  then  exists
         or would be caused  thereby,  the Borrower may  consummate  each of the
         Pre-Approved  Transactions  (other than the  transaction  described  in
         clause (xiii) below); and

                  (xiii)  so long as (A) no  Default  or Event of  Default  then
         exists or would be caused  thereby and (B) the Borrower  shall  provide
         the  Arrangers  with  evidence  satisfactory  to each of them  that the
         revenue and cash flow acquired by the Borrower in connection  with each
         such Acquisition  shall have no material  negative  deviations from the
         projected   revenue  and  cash  flow   relating  to   broadcast   tower
         Acquisitions as set forth in the Borrower's Projections with respect to
         such  Acquisitions  dated  December  1999, the Borrower may make one or
         more  Acquisitions  of broadcast  towers,  or of Persons engaged in the
         broadcast   tower   business,   on  terms  and  conditions   reasonably
         satisfactory  to the Arrangers and having an aggregate  Purchase Price,
         for all such Acquisitions, not to exceed $70,000,000 (inclusive of cash
         and stock consideration)."

10. Amendment to Section 8.7. Section 8.7 of the Credit Agreement,  Restricted
Payments and Purchases, is hereby amended by adding the following new subsection
(g) to the end thereof:

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                   (g) on the  date on  which  the  Apex  Acquisition  shall  be
         consummated,  repayment  of any  existing  Indebtedness  of  Apex in an
         aggregate amount not to exceed $3,000,000."

11. Amendment to Section 8.9. Section 8.9 of the Credit  Agreement,  Corporate
Name;  Corporate Structure;  Business,  is hereby amended by deleting subsection
(b) therefrom and by substituting the following in lieu thereof:

                   (b) with respect to the Borrower and its Subsidiaries, engage
         in any  businesses  other  than  the  Tower  Operations  and the  Other
         Operations and activities related or incident thereto, and with respect
         to  Holdco,  engage in any  business  other  than that of  holding  the
         Capital Stock of (i) the Borrower,  (ii) any shell Subsidiary formed by
         Holdco   solely  for  the  purpose  of   consummating   any   Permitted
         Acquisition,   and  (iii)  on  the  closing   date  of  any   Permitted
         Acquisition,  any  target  company  acquired  in  connection  with such
         Permitted  Acquisition  immediately  prior to the  contribution of such
         Capital Stock to the Borrower"

12.  Waiver.  Pursuant to Section 4.5 of the Credit  Agreement,  the  Borrower
agreed to deliver to the Arrangers a duly executed landlord waiver agreement, in
form and substance satisfactory to the Arrangers and their counsel, with respect
to the  Borrower's  principal  place of  business  and the  Borrower's  premises
located at One Chase Corporate Drive,  Hoover,  Alabama,  on or before September
30, 1999 (such landlord waiver agreements being  hereinafter  referred to as the
"Required  Landlord  Waivers").  As of the date  hereof,  the  Borrower  has not
delivered  the  required  landlord  waiver  agreements  to  the  Arrangers  (the
"Landlord  Waiver  Default").   The  Arrangers,   the  Syndication   Agent,  the
Administrative  Agent,  the Collateral Agent and the Credit Parties hereby waive
the Landlord Waiver Default  existing as of the date hereof and hereby waive the
requirement  of  Section  4.5 that the  Borrower  deliver to the  Arrangers  the
Required  Landlord Waivers.  The waivers set forth in the immediately  preceding
sentence shall not waive any other requirement or hinder,  restrict or otherwise
modify the rights and remedies of the  Arrangers,  the  Syndication  Agent,  the
Administrative  Agent, the Collateral Agent and the Credit Parties following the
occurrence of any Default or Event of Default under the Credit Agreement.

13. No Other  Amendments,  Waivers or  Consents.  Except  for the  amendments,
waivers and consents set forth above,  the text of the Credit  Agreement and the
other Loan Documents  shall remain  unchanged and in full force and effect,  and
the Arrangers,  the Syndication Agent, the Administrative  Agent, the Collateral
Agent  and the  Credit  Parties  hereby  reserve  the  right to  require  strict
compliance with the terms of the Credit  Agreement and the other Loan Documents,
including,  without  limitation,  all terms  applicable to  Subsidiaries  of the
Borrower, in the future.

14.  Conditions  Subsequent.  As a  condition  subsequent  to the  amendments,
waivers and consents set forth in this Amendment,  the Borrower shall perform or
cause to be performed the  following  (the failure by the Borrower to so perform
or  cause  to be  performed  for

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any  reason  (other  than  the  fact  that  the Pre-Approved   Transaction  to
which  such  condition   relates  was  not  ever consummated) constituting an
Event of Default under the Credit Agreement):

(a)      Collateral.   On  the  closing  date  for  each  of  the   Pre-Approved
         Transactions, the Borrower shall execute and deliver, or as applicable,
         cause its Subsidiaries to execute and deliver,  to the Collateral Agent
         all agreements, instruments and other items required to be so delivered
         pursuant to Section 6.16 of the Credit Agreement.

(b)      Definitive  Documentation.  Promptly  upon the  closing  of each of the
         Pre-Approved Transactions,  the Borrower shall deliver to the Arrangers
         a full set of copies of the documents  executed in connection with such
         Pre-Approved Transaction.

15. Conditions to  Effectiveness.  This Amendment shall be effective as of the
date first written above (the "Effective Date") upon the following:

                  (a) the Administrative Agent's receipt of a counterpart hereof
 duly executed by the Borrower and Holdco, and by the Majority Lenders;

                  (b) with respect to each of the Pre-Approved Transactions, the
         Arrangers'  receipt  of  (i)  updated   Projections  for  the  Borrower
         demonstrating  the Borrower's pro forma  compliance  with the Financial
         Covenants after giving effect thereto,  and (ii) copies of any material
         agreements relating to such Pre-Approved  Transaction in the possession
         of the Borrower; and

                  (c) the  representations  and  warranties  of  Holdco  and the
         Borrower set forth in the Credit  Agreement and this  Amendment,  other
         than those that are expressly  made as of a specific date, are true and
         correct in all  material  respects  with the same effect as though such
         representations and warranties had been made on and as of the Effective
         Date.

16.  Representations  and  Warranties.  Each of the Borrower  and Holdco,  for
itself  and on  behalf  of  each of its  Subsidiaries,  agrees,  represents  and
warrants in favor of the Arrangers,  the Syndication  Agent, the  Administrative
Agent, the Collateral Agent and the Credit Parties that:

(a)      This  Amendment  has been  executed and  delivered  by duly  authorized
         representatives  of the Borrower and Holdco,  and the Credit Agreement,
         as modified and amended by this Amendment,  constitutes a legal,  valid
         and binding  obligation  of the Borrower and Holdco and is  enforceable
         against the Borrower and Holdco in accordance with its terms, except as
         enforceability may be limited by bankruptcy, insolvency, reorganization
         or  similar  laws  affecting  creditors'  rights  generally  and by the
         application of general equitable principles;

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(b)      Before and after giving effect to this  Amendment,  no Default or Event
         of Default  with  respect to the  Borrower  or Holdco  (other  than the
         Defaults  and Events of  Default  described  in Section 12 hereof)  has
         occurred and is continuing;

(c)      As of  the  date  hereof  and  after  giving  effect  to  each  of  the
         Pre-Approved Transactions,  (i) the property of the Borrower, at a fair
         valuation  on a going  concern  basis,  will exceed its debt;  (ii) the
         capital of the Borrower will not be  unreasonably  small to conduct its
         business;  and (iii) the Borrower will not have incurred debts, or have
         intended to incur  debts,  beyond its ability to pay such debts as they
         mature;

(d)      No  event  contemplated  in  connection  with  any of the  Pre-Approved
         Transactions  shall occur,  which has not been  consented to or waived,
         the  occurrence  of which  constitutes,  or with the passage of time or
         giving  of notice or both  would  constitute,  a  material  default  by
         Holdco, the Borrower or any of their respective  Subsidiaries under any
         material indenture,  agreement or other instrument,  including, without
         limitation,  the material Necessary  Authorizations and the Indentures,
         or any judgment,  decree or order, to which Holdco, the Borrower or any
         of their  respective  Subsidiaries  is a party or by which Holdco,  the
         Borrower  or any  of  their  respective  Subsidiaries  or any of  their
         respective properties may be bound or affected; and

(e)      All of the  representations  and  warranties of Holdco and the Borrower
         contained  in the Credit  Agreement  (other  than  representations  and
         warranties  that relate solely to a specified date) continue to be true
         and  correct in all  material  respects as of the date hereof as though
         made on and as of such date.

17. Effect on the Credit  Agreement.  Except as specifically  provided herein,
the  Credit  Agreement  shall  remain in full  force and  effect,  and is hereby
ratified,  reaffirmed and confirmed. This Amendment shall be deemed to be a Loan
Document for all purposes.

18.  Counterparts.  This  Amendment  may be executed in any number of separate
counterparts and by the different parties hereto on separate counterparts,  each
of which shall be deemed an original and all of which, taken together,  shall be
deemed to constitute one and the same  instrument.  In proving this Amendment in
any  judicial  proceedings,  it shall not be necessary to produce or account for
more than one such counterpart signed by the party against whom such enforcement
is sought. Any signatures  delivered by a party by facsimile  transmission shall
be deemed an original signature hereto.

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19. Law of Contract.  THIS CONSENT SHALL BE CONSTRUED IN  ACCORDANCE  WITH AND
GOVERNED BY THE INTERNAL  LAWS OF THE STATE OF NEW YORK  APPLICABLE TO CONTRACTS
MADE AND TO BE PERFORMED WHOLLY WITHIN SUCH STATE.

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<PAGE>   11

SECOND AMENDMENT (SPECTRASITE COMMUNICATIONS, INC.)
         IN WITNESS WHEREOF, this Amendment has been duly executed as of the day
and year first written above.

BORROWER:                   SPECTRASITE COMMUNICATIONS, INC.

                                    By:              /s/  David P. Tomick
                                                     ---------------------------
                                    Name:            David P. Tomick
                                    Title:           Executive Vice President

                                    Attest:
                                            Name:
                                            Title:

HOLDCO:                    SPECTRASITE HOLDINGS, INC.

                                    By:              /s/  David P. Tomick
                                                     ---------------------------
                                    Name:            David P. Tomick
                                    Title:           Executive Vice President

                                    Attest:
                                    Name:
                                    Title:

<PAGE>   12

ADMINISTRATIVE
AGENT:                              CANADIAN IMPERIAL BANK OF COMMERCE

                                    By:              /s/  Colleen Risorto
                                                     ---------------------------
                                    Name:            Colleen Risorto
                                    Title:           Executive Director
                        CIBC World Markets Corp. As Agent

<PAGE>   13

ARRANGERS:                          CIBC WORLD MARKETS CORP.
                                    (f/k/a CIBC Oppenheimer Corp.)

                                    By:              /s/  Colleen Risorto
                                                     ---------------------------
                                    Name:            Colleen Risorto
                                    Title:           Executive Director
                        CIBC World Markets Corp. As Agent

                                    CREDIT SUISSE FIRST BOSTON

                                    By:              /s/  Jeffrey B. Ulmer
                                                     ---------------------------
                                    Name:            Jeffrey B. Ulmer
                                    Title:           Vice President

                                    By:              /s/ Douglas E. Maher
                                                     ---------------------------
                                    Name:            Douglas E. Maher
                                    Title:           Vice President

<PAGE>   14

COLLATERAL AGENT: CANADIAN IMPERIAL BANK OF COMMERCE

                                    By:              /s/  Colleen Risorto
                                                     ---------------------------
                                    Name:            Colleen Risorto
                                    Title:           Executive Director
                        CIBC World Markets Corp. As Agent

<PAGE>   15

SYNDICATION AGENT:         CREDIT SUISSE FIRST BOSTON

                                    By:              /s/  Jeffrey B. Ulmer
                                                     ---------------------------
                                    Name:            Jeffrey B. Ulmer
                                    Title:           Vice President

                                    By:              /s/  Douglas E. Maher
                                                     ---------------------------
                                    Name:            Douglas E. Maher
                                    Title:           Vice President

<PAGE>   16

MANAGING AGENTS:           BANK OF MONTREAL, CHICAGO BRANCH

                                    By:             /s/  Karen Klapper
                                                    ----------------------------
                                    Name:            Karen Klapper
                                    Title:           Director

                                    THE BANK OF NOVA SCOTIA

                                    By:         /s/  Vincent J. Fitzgerald, Jr.
                                                --------------------------------
                                    Name:            Vincent J. Fitzgerald, Jr.
                                    Title:           Authorized Signatory

                                    FLEET NATIONAL BANK (f/k/a BankBoston, N.A.)

                                    By:              /s/  Shepard D. Rainie
                                                     ---------------------------
                                    Name:            Shepard D. Rainie
                                    Title:           Managing Director

                           DRESDNER BANK AG, NEW YORK AND GRAND CAYMAN BRANCHES

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

                                    By:             /s/  Brian E. Haughney
                                                    ----------------------------
                                    Name:            Brian E. Haughney
                                    Title:           Assistant Vice President

                                    TORONTO DOMINION (TEXAS), INC.

                                    By:             /s/  Sheila M. Conley
                                                    ----------------------------
                                    Name:            Sheila M. Conley
                                    Title:           Vice President

                                    UNION BANK OF CALIFORNIA, N.A.

                                    By:             /s/  Peter C. Connoy
                                                    ----------------------------
                                    Name:            Peter C. Connoy
                                    Title:           Vice President

<PAGE>   17

CO-AGENT:                           CREDIT LYONNAIS NEW YORK BRANCH

                                    By:             /s/  Mark A. Campellone
                                                    ----------------------------
                                    Name:            Mark A. Campellone
                                    Title:           First Vice President

<PAGE>   18

LENDERS:                   CIBC INC.

                                    By:              /s/  Colleen Risorto
                                                     ---------------------------
                                    Name:            Colleen Risorto
                                    Title:           Executive Director
                        CIBC World Markets Corp. As Agent

<PAGE>   19

                                    CREDIT SUISSE FIRST BOSTON

                                    By:              /s/  Jeffrey B. Ulmer
                                                     ---------------------------
                                    Name:            Jeffrey B. Ulmer
                                    Title:           Vice President

                                    By:              /s/  Douglas E. Maher
                                                     ---------------------------
                                    Name:            Douglas E. Maher
                                    Title:           Vice President

<PAGE>   20

                                    BANK OF MONTREAL, CHICAGO BRANCH

                                    By:             /s/  Karen Klapper
                                                    ----------------------------
                                    Name:            Karen Klapper
                                    Title:           Director

<PAGE>   21

                                    THE BANK OF NOVA SCOTIA

                                    By:          /s/  Vincent J. Fitzgerald, Jr.
                                                 -------------------------------
                                    Name:             Vincent J. Fitzgerald, Jr.
                                    Title:           Authorized Signatory

<PAGE>   22

                                    FLEET NATIONAL BANK (f/k/a BankBoston, N.A.)

                                    By:              /s/  Shepard D. Rainie
                                                     ---------------------------
                                    Name:                 Shepard D. Rainie
                                    Title:                Managing Director

<PAGE>   23

                            DRESDNER BANK AG, NEW YORK AND GRAND CAYMAN BRANCHES

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

                                    By:              /s/  Brian E. Haughney
                                                     ---------------------------
                                    Name:            Brian E. Haughney
                                    Title:           Assistant Vice President

<PAGE>   24

                                    TORONTO DOMINION (TEXAS), INC.

                                    By:              /s/  Sheila M. Conley
                                                     ---------------------------
                                    Name:            Sheila M. Conley
                                    Title:           Vice President

<PAGE>   25

                                    UNION BANK OF CALIFORNIA, N.A.

                                    By:              /s/  Peter C. Connoy
                                                     ---------------------------
                                    Name:            Peter C. Connoy
                                    Title:           Vice President

<PAGE>   26

                                    CREDIT LYONNAIS NEW YORK BRANCH

                                    By:              /s/  Mark A. Campellone
                                                     ---------------------------
                                    Name:            Mark A. Campellone
                                    Title:           First Vice President

<PAGE>   27

                                    THE BANK OF NEW YORK

                                    By:              /s/  Gerry Granovsky
                                                     ---------------------------
                                    Name:            Gerry Granovsky
                                    Title:           Vice President

<PAGE>   28

                                    CAISSE DE DEPOT ET PLACEMENT DU QUEBEC

                                    By:              /s/  Louis Lavoie
                                                     ---------------------------
                                    Name:            Louis Lavoie
                                    Title:           Manager

                                    By:              /s/  Lucie Rousseau
                                                     ---------------------------
                                    Name:            Lucie Rousseau
                                    Title:           Vice President

<PAGE>   29

                                    CANADIAN IMPERIAL BANK OF COMMERCE

                                    By:              /s/  Colleen Risorto
                                                     ---------------------------
                                    Name:            Colleen Risorto
                                    Title:           Executive Director
                        CIBC World Markets Corp. As Agent

<PAGE>   30

                                    THE CIT GROUP/EQUIPMENT FINANCING, INC.

                                    By:             /s/  Daniel E. A. Nichols
                                                    ----------------------------
                                    Name:            Daniel E. A. Nichols
                                    Title:           Assistant Vice President

<PAGE>   31

                                    CYPRESSTREE INVESTMENT FUND, LLC

                       By:     CypressTree Investment Management Company, Inc.,
                               its Managing Member

                                    By:
                                    Name:
                                    Title:

<PAGE>   32

                                    NORTHAMERICAN SENIOR FLOATING RATE FUND

                       By:     CypressTree Investment Management Company, Inc.,
                               its Managing Member

                                    By:
                                    Name:
                                    Title:

<PAGE>   33

                                 CYPRESSTREE INVESTMENT MANAGEMENT COMPANY, INC.

                       As:     Attorney-in-Fact and on behalf of First Allmerica
                               Financial Life Insurance Company as Portfolio
                               Manager

                                    By:
                                    Name:
                                    Title:

<PAGE>   34

                                    KZH CYPRESSTREE-1 LLC

                                    By:              /s/  Peter Chin
                                                     ---------------------------
                                    Name:            Peter Chin
                                    Title:           Authorized Agent

<PAGE>   35

                                    FREMONT INVESTMENT & LOAN

                                    By:
                                    Name:
                                    Title:

<PAGE>   36

                                    HELLER FINANCIAL, INC.

                                    By:              /s/  Scott Ziemke
                                                     ---------------------------
                                    Name:            Scott Ziemke
                                    Title:           Assistant Vice President

<PAGE>   37

                                    MERRILL LYNCH SENIOR FLOATING RATE
                                    FUND, INC.

                                    By:
                                    Name:
                                    Title:

<PAGE>   38

                   PPM AMERICA, INC., as attorney in fact, on behalf of Jackson
                   National Life Insurance Company

                                    By:
                                    Name:
                                    Title:

<PAGE>   39

                 Fleet   National  Bank  (f/k/a   BankBoston, N.A.), as Trust
                 Administrator for LONGLANE MASTER TRUST IV

                                    By:
                                    Name:
                                    Title:

<PAGE>   40

                                    GALAXY CLO 1999-1, LTD.

                    By:     SAI Investment Advisor, Inc., its Collateral Manager

                                    By:
                                    Name:
                                    Title:

<PAGE>   41

                                    OXFORD STRATEGIC INCOME FUND

                           By:     Eaton Vance Management, as Investment Advisor

                                    By:              /s/  Scott H. Page
                                                     ---------------------------
                                    Name:            Scott H. Page
                                    Title:           Vice President

<PAGE>   42

                                    SENIOR DEBT PORTFOLIO

                   By:     Boston Management and Research, as Investment Advisor

                                    By:              /s/ Scott H. Page
                                                     ---------------------------
                                    Name:            Scott H. Page
                                    Title:           Vice President

<PAGE>   43

                                    J.H. WHITNEY MARKET VALUE FUND, L.P.

                        By:     J.H. Whitney Value GP, Ltd., its General Partner

                                    By:
                                    Name:
                                    Title:

<PAGE>   44

                                    J.H. WHITNEY MEZZANINE FUND, L.P.

                               By:           Whitney GP, Ltd. - General Partner
                                             -----------------------------------

                                    By:              /s/  Daniel J. O'Brien
                                                     ---------------------------
                                    Name:            Daniel J. O'Brien
                                    Title:           Managing Member

<PAGE>   45

                                    BANK OF AMERICA, N.A.

                                    By:
                                    Name:
                                    Title:

<PAGE>   46

                                    DEBT STRATEGIES FUND II, INC.

                                    By:
                                    Name:
                                    Title:

<PAGE>   47

                                    DEBT STRATEGIES FUND III, INC.

                                    By:
                                    Name:
                                    Title:

<PAGE>   48

                                    THE FUJI BANK, LIMITED, NEW YORK BRANCH

                                    By:
                                    Name:
                                    Title:

<PAGE>   49

                                    VAN KAMPEN SENIOR INCOME TRUST

                                    By:            /s/  Darvin D. Pierce
                                                   -----------------------------
                                    Name:          Darvin D. Pierce
                                    Title:           Vice President

<PAGE>   50

                                    PROSPECT INTERNATIONAL DEBT
                                    STRATEGY FUND

                                    By:
                                    Name:
                                    Title:

<PAGE>   51

                                    CARAVELLE INVESTMENT FUND L.L.C.

                                    By:              /s/  Dean T. Criares
                                                     ---------------------------
                                    Name:            Dean T. Criares
                                    Title:           Managing Director

<PAGE>   52

                                    EATON VANCE SENIOR INCOME TRUST

                                    By:              /s/  Scott H. Page
                                                     ---------------------------
                                    Name:            Scott H. Page
                                    Title:           Vice Presisdent

<PAGE>   53

                                    MERRILL LYNCH SENIOR FLOATING RATE
                                    FUND    II, INC.

                                    By:
                                    Name:
                                    Title:

<PAGE>   54

                                     MORGAN STANLEY DEAN WITTER PRIME
                                    INCOME TRUST

                                    By:
                                    Name:
                                    Title:

<PAGE>   55

                                    ELC "Cayman" Ltd. 1999-III

                                    By:              /s/  Thomas M.Finke
                                                     ---------------------------
                                    Name:            Thomas M. Finke
                                    Title:           Managing Director<PAGE>   1
                                                                   Exhibit 10.27

                       THIRD AMENDMENT TO CREDIT AGREEMENT

              This THIRD  AMENDMENT TO CREDIT  AGREEMENT  (this  "Amendment") is
entered into as of February 14, 2000, by and among  SpectraSite  Communications,
Inc., a Delaware  corporation (the "Borrower"),  SpectraSite  Holdings,  Inc., a
Delaware  corporation  ("Holdco"),  CIBC World Markets  Corp.  and Credit Suisse
First Boston,  as arrangers (the  "Arrangers"),  Credit Suisse First Boston,  as
syndication agent (the "Syndication Agent"), Canadian Imperial Bank of Commerce,
as administrative agent (the "Administrative Agent"),  Canadian Imperial Bank of
Commerce,  as collateral  agent (the "Collateral  Agent"),  and the other Credit
Parties signatory hereto (the "Credit Parties").

                              W I T N E S S E T H:

              WHEREAS,  the Borrower,  Holdco,  the Arrangers,  the  Syndication
Agent, the Administrative Agent, the Collateral Agent and the Credit Parties are
parties to that certain Credit  Agreement dated as of April 20, 1999, as amended
by that certain First Amendment to Credit  Agreement dated as of August 23, 1999
and that certain Second  Amendment to Credit  Agreement dated as of December 22,
1999 (as the same may be further  amended,  restated,  supplemented or otherwise
modified from time to time, the "Credit Agreement"); and

              WHEREAS,   the  Borrower  and  Holdco  have  requested,   and  the
Arrangers, the Syndication Agent, the Administrative Agent, the Collateral Agent
and the Credit Parties have agreed,  to amend the Credit Agreement as and to the
extent set forth herein;

              NOW THEREFORE,  in  consideration of the premises set forth above,
the  terms  and  conditions   contained  herein  and  other  good  and  valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, the
parties  hereby  agree that all  capitalized  terms used  herein  shall have the
meanings ascribed thereto in the Credit Agreement,  as amended hereby, except as
otherwise  defined  or  limited  herein,  and  further  agree,  subject  to  the
conditions precedent to this Amendment hereinafter set forth, as follows:

1.          Amendment to Article 1.

(a)ab Article 1 of the Credit  Agreement,  Definitions,  is hereby  modified and
amended by adding the  following  new  definitions  to be placed in  appropriate
alphabetical order:

                      "Additional   Nextel   Towers"  shall  mean  those  Towers
              acquired in  connection  with the Nextel 2 Purchase  Documents and
              any additional Towers acquired from Nextel.

                      "`AirTouch' shall mean AirTouch Communications, Inc., a
              Delaware corporation."

                                       1
<PAGE>   2

                      "`AirTouch  Acquisition'  shall  mean the  Acquisition  by
              California   Tower  of  certain  Tower  Assets  from  AirTouch  in
              conjunction  with up to 550 Tower Sites  pursuant to the terms and
              conditions  of the AirTouch  Purchase  Documents  for an aggregate
              purchase price not to exceed $198,000,000.

                      "`AirTouch  Purchase  Documents' shall mean those certain
              documents set forth on Schedule 1.1 attached hereto and
                        -----------------------------
              made a part hereof.

                      "`AirTouch Tenants' shall mean AirTouch and any of its
              subsidiaries or controlled Affiliates.

                      "`California  Tower' shall mean California Tower,  Inc., a
              Delaware   corporation  and  a  wholly  owned  Subsidiary  of  the
              Borrower.

                      "`Nextel  2  Acquisition'  shall mean the  Acquisition  by
              Tower Sub of certain Tower Assets from Nextel in conjunction  with
              up to twenty-six  (26) sites  pursuant to the terms and conditions
              of the Nextel 2 Purchase Documents.

                      "Nextel 2  Purchase  Documents'  shall  mean the  purchase
              agreement  and  related  documents  pursuant  to which  Tower  Sub
              acquires certain  Additional Nextel Towers from Nextel West Corp.,
              a Delaware  Corporation,  Nextel of  California,  Inc., a Delaware
              corporation,   each  d/b/a  Nextel   Communications,   and  Nextel
              Communications, Inc., a Delaware corporation.

(b) Article 1 of the Credit Agreement, Definitions, is hereby further modified
and amended by deleting  the existing  definitions  of "Future  Nextel  Towers,"
"Pre-Approved  Transactions"  and  "Pre-Approved  Transaction  Documents" and by
substituting the following in lieu thereof:

                      "`Future  Nextel Towers' shall mean (i) those Towers,  the
              construction  of which is completed after the Agreement Date by or
              for any of the  Nextel  Tenants,  or to  which  any of the  Nextel
              Tenants otherwise  acquires rights after the Agreement Date, which
              are sold,  transferred  or assigned  to Tower Sub  pursuant to the
              terms  of the  Master  Site  Commitment  Agreement,  and  (ii) the
              Additional Nextel Towers."

                      "`Pre-Approved Transactions' shall mean, collectively, the
              Apex   Acquisition,   the  DigiPH   Acquisition,   the   UbiquiTel
              Investment, the AirTouch Acquisition, the Nextel 2 Acquisition and
              the Acquisitions described in Section 8.5(xiii) hereof.

                      "`Pre-Approved    Transaction   Documents'   shall   mean,
              collectively,  the Westower Merger  Agreement,  the NTA Investment
              Documents,   the  Apex  Acquisition  Documents,   DigiPH  Purchase
              Documents,   the  UbiquiTel  Investment  Documents,  the  AirTouch
              Purchase Documents, the Nextel 2 Purchase Documents, the documents
              relating to the  acquisition  of Additional  Nextel Towers and the
              documents  relating  to

                                       2
<PAGE>   3

              the  Acquisitions  described  in  Section 8.5(xiii) hereof
             (including all schedules and exhibits thereto).

2.  Amendment to Article 5. Section 5.1(h) of the Credit  Agreement,  Title to
Assets,  is hereby modified and amended by deleting the last sentence  therefrom
and by substituting the following in lieu thereof:

              "Tower  Sub does not own any  material  Assets  other  than  Tower
              Assets  comprising  the  Nextel  Collateral,   Tower  Space  Lease
              Agreements  with  Co-Locators  on  Towers  comprising  the  Nextel
              Collateral and the Additional Nextel Towers. California Tower does
              not own any  material  Assets  other  than Tower  Assets  acquired
              pursuant to the  AirTouch  Acquisition  Documents  and  additional
              Tower Assets acquired in accordance with Section  8.5(iii) of this
              Agreement.  Holdco does not own any material Assets other than (i)
              the Capital Stock of the  Borrower,  (ii) the Capital Stock of any
              shell  Subsidiary  formed  by Holdco  solely  for the  purpose  of
              consummating any Permitted  Acquisition,  and (iii) on the closing
              date of any Permitted Acquisition, the Capital Stock of any target
              company  acquired in connection  with such  Permitted  Acquisition
              immediately prior to the contribution of such Capital Stock to the
              Borrower."

3.          Amendment to Section 8.2.

(a)ab Section 8.2 of the Credit Agreement,  Investments,  is hereby modified and
amended by adding "and California Tower" after the reference to Tower Sub in the
parenthetical  in line 4 thereof,  such that after  giving  effect  thereto such
Section 8.2 shall begin as follows:

                      "Section 8.2  Investments. Neither Holdco nor the Borrower
              shall,  and the Borrower shall not permit any of its Subsidiaries
              to, make any loan or advance, or make any Investment  or otherwise
              acquire any evidences of Funded Debt, Capital Stock or other
              securities of any Person,  except that the Borrower and its
              Subsidiaries (other than Tower Sub and California Tower) may  . ."

(b)  Section  8.2 of the  Credit  Agreement,  Investments,  is hereby  further
modified and amended by deleting  existing  clause (e) thereof and  substituting
the following therefor:

                      "(e) make loans or advances to  employees  in the ordinary
              course of business in an aggregate amount not to exceed $2,000,000
              at any time outstanding;"

                                       3
<PAGE>   4

4.          Amendment to Section 8.5.

(a)ab Section 8.5 of the Credit Agreement,  Liquidation;  Merger; Acquisition or
Disposition of Assets,  is hereby modified and amended by adding "and California
Tower"  after  the  reference  to Tower  Sub in the  parenthetical  in line 1 of
subsection (ii) (A) thereof,  such that after giving effect thereto, the text of
such Section 8.5(ii)(A) prior to the proviso therein shall read as follows:

                      "(A) a merger  among  Holdco,  the Borrower or one or more
              Subsidiaries  (other than Tower Sub and California  Tower) with or
              into any other Person,  or, subject to Section  8.5(vii) below, an
              Acquisition permitted hereunder effected by a merger;"

(b) Section 8.5 of the Credit Agreement,  Liquidation;  Merger; Acquisition or
Disposition  of Assets,  is hereby  further  modified  and  amended by  deleting
existing  subsections  (ii) (B) and (C) thereof and  substituting  the following
therefor:

                      "(B) a merger between or among two or more Subsidiaries
(other than Tower Sub and California Tower); and

                      (C)  a  liquidation   or   dissolution   of  one  or  more
              Subsidiaries  (other Tower Sub and  California  Tower) into its or
              their  parent  entity   (provided  the  Borrower  or  one  of  its
              Subsidiaries  (other than Tower Sub and California  Tower) is such
              parent entity);"

(c) Section 8.5 of the Credit Agreement,  Liquidation;  Merger; Acquisition or
Disposition  of Assets,  is hereby  further  modified  and  amended by  deleting
existing subsection (iii) thereof and substituting the following therefor:

                      "(iii) subject to compliance  with Sections 6.10, 6.16 and
              8.5(vii)  hereof,  (A) Tower Sub may  acquire  the  Future  Nextel
              Towers and the Additional  Nextel Towers and (B) California  Tower
              may acquire  additional Tower Assets from AirTouch with respect to
              which an AirTouch Tenant is the anchor tenant;"

(d) Section 8.5 of the Credit Agreement,  Liquidation;  Merger; Acquisition or
Disposition  of Assets,  is hereby  further  modified  and  amended by  deleting
existing subsection (v) thereof and substituting the following therefor:

                      "(v) the Borrower and its  Subsidiaries  (other than Tower
              Sub and  California  Tower) may (A) make  Investments as permitted
              under  Section  8.2(a) and (b)  hereof,  and (B)  transfer  Assets
              amongst themselves;"

(e) Section 8.5 of the Credit Agreement,  Liquidation;  Merger; Acquisition or
Disposition of Assets,  is hereby  further  modified and amended by deleting the
opening  paragraph of existing  subsection  (vii) thereof and  substituting  the
following therefor:

                                       4
<PAGE>   5

                      "(vii) subject to compliance with Section 6.10 and Section
              6.16 hereof,  the Borrower and its Subsidiaries  (other than Tower
              Sub and California Tower) may make  Acquisitions,  and Investments
              (including  the   acquisition  of  Capital  Stock  or  the  equity
              interests in persons  engaged in  businesses  similar to the Tower
              Operations) and form Subsidiaries with respect thereto,  and Tower
              Sub  and  California  Tower  may  make  acquisitions  of the  type
              permitted under Section 8.5(iii)  hereof,  in each case subject to
              the following conditions:"

(f) Section 8.5 of the Credit Agreement,  Liquidation;  Merger; Acquisition or
Disposition  of Assets,  is hereby  further  modified  and  amended by  deleting
existing part (B) of subsection  (vii)  thereof and  substituting  the following
therefor:

                               "(B) the  Purchase  Price with  respect  any such
                      Acquisition  or Investment  shall be (I) payable solely in
                      common stock of Holdco, or (II) payable in cash so long as
                      (x) the cash portion of the Purchase Price with respect to
                      any single  Acquisition  or Investment  (with respect to a
                      single  transaction  or a series of related  transactions)
                      shall not exceed  $50,000,000,  and (y) the aggregate cash
                      portion  of  the  Purchase  Price  for   Acquisitions  and
                      Investments  consummated  pursuant  to this  clause  (vii)
                      (other than Tower Assets  acquired  pursuant to subsection
                      8.5(iii)) during the period from the Second Amendment Date
                      through  the  Tranche B  Maturity  Date,  shall not exceed
                      $200,000,000;

(g) Section 8.5 of the Credit Agreement,  Liquidation;  Merger; Acquisition or
Disposition  of Assets,  is hereby  further  modified  and  amended by  deleting
existing subsection (viii) thereof and substituting the following therefor:

                      "(viii)  the  Borrower  and its  Subsidiaries  (other than
              Tower Sub and California  Tower) may acquire and construct  Towers
              and Tower Sites without an anchor tenant reasonably  acceptable to
              the  Arrangers  (with any Nextel  Tenant or AirTouch  Tenant being
              deemed  acceptable)  under  contract,  so  long  as the  aggregate
              Investment  for such  Towers and Tower  Sites is at all times less
              than $10,000,000,  provided,  however, that if the Borrower or the
              applicable Subsidiary shall enter into a binding contract with any
              anchor tenant  reasonably  acceptable  to the Arrangers  (with any
              Nextel  Tenant or AirTouch  Tenant being deemed  acceptable)  with
              respect  to any such  Tower or Tower  Site,  the book value of the
              Investment  of the Borrower or the  applicable  Subsidiary in such
              Tower  or  Tower  Site  shall  be  thereafter  excluded  from  the
              investments  subject to the  $10,000,000  limitation  provided for
              herein;"

(h) Section 8.5 of the Credit Agreement,  Liquidation;  Merger; Acquisition or
Disposition  of Assets,  is hereby  further  modified  and  amended by  deleting
existing subsection (xii) thereof and substituting the following therefor:

                      "(xii)  so long as no  Default  or Event of  Default  then
              exists or would be caused  thereby,  subject  to  compliance  with
              Sections 6.10 and 6.16 hereof,  the

                                       5
<PAGE>   6

              Borrower and its  Subsidiaries (other than Tower Sub and
              California Tower) may consummate each of the Pre-Approved
              Transactions (other than the Nextel 2 Acquisition
              and the transaction described in clause (xiii) below);"

5.  Amendment to Section 8.6.  Section 8.6  Limitation on Guaranties is hereby
amended by adding  the words "and  California  Tower" to the  parenthetical  set
forth in item (d) thereof,  such that after giving effect  thereto,  item (d) of
Section 8.6 shall read as follows:

                      "(d)   a guaranty by Holdco,  the  Borrower  or any of its
              Subsidiaries  (other than Tower Sub and  California Tower) of the
              performance obligations of the Borrower or any of its
              Subsidiaries."

6.  Amendment to Article 10. Section 10.1 of the Credit  Agreement,  Events of
Default  (Senior  Obligations),  is hereby  modified and amended by deleting the
world "or" after item (r)  thereof,  deleting  the period after item (s) thereof
and inserting "; or"  therefor,  and adding the  following  new  subsection  (t)
thereafter:

                      "(t)  (i) An  event  of  default  shall  occur  under  the
              Sublease  (as  defined  in  the  Schedule  of  AirTouch   Purchase
              Documents  appended  to the  Third  Amendment  to this  Agreement)
              entitling the sublessor  thereunder to (x) terminate such Sublease
              with respect to Material  Towers,  or (y)  terminate  the Sublease
              with  respect to all sites  subject  thereto,  or (ii) an event of
              default  shall occur under the Master Tower Site Lease (as defined
              in the  schedule of AirTouch  Purchase  Documents  attached to the
              Third Amendment to this Agreement) entitling AirTouch to terminate
              such Master Tower Site Lease with respect to Material Towers."

7. No Other Amendments. Except for the amendments set forth above, the text of
the Credit  Agreement and the other Loan Documents shall remain unchanged and in
full  force  and  effect,   and  the  Arrangers,   the  Syndication  Agent,  the
Administrative Agent, the Collateral Agent and the Credit Parties hereby reserve
the right to require strict  compliance  with the terms of the Credit  Agreement
and  the  other  Loan  Documents,   including,  without  limitation,  all  terms
applicable to Subsidiaries of the Borrower, in the future.

8.  Conditions  Subsequent.  As a condition  subsequent to the  amendments set
forth in this Amendment, the Borrower shall perform or cause to be performed the
following  (the  failure by the  Borrower to so perform or cause to be performed
for any reason constituting an Event of Default under the Credit Agreement):

(a)           Collateral.  On  each  of  the  closing  dates  for  the  AirTouch
              Acquisition,  the  Borrower  shall  execute  and  deliver,  or  as
              applicable,  cause its Subsidiaries to execute and deliver, to the
              Collateral  Agent all  agreements,  instruments  and  other  items
              required to be so delivered pursuant to Section 6.16 of the Credit
              Agreement,  including, without limitation, a collateral assignment
              of the AirTouch Purchase  Documents in favor of the Administrative
              Agent.
                                       6
<PAGE>   7

(b)           Definitive  Documentation.  Promptly  upon  the  closing  of  each
              AirTouch Acquisition,  the Borrower shall deliver to the Arrangers
              a full set of copies of the documents  executed in connection with
              such Acquisition, which documents shall not differ materially from
              the drafts thereof furnished to the Administrative  Agent prior to
              the Effective Date (as defined below).

9.   Conditions to  Effectiveness.  This Amendment shall be effective as of the
date first written above (the "Effective Date") upon the following:

                      (a)  the  Administrative Agent's  receipt of a counterpart
 hereof duly executed by the Borrower and Holdco, and by the Majority Lenders;

                      (b)  the  Arrangers'  receipt  of,  with  respect  to  the
              AirTouch   Acquisition,   updated  Projections  for  the  Borrower
              demonstrating   the  Borrower's  pro  forma  compliance  with  the
              Financial Covenants after giving effect thereto; and

                      (c) the  representations  and warranties of Holdco and the
              Borrower  set forth in the Credit  Agreement  and this  Amendment,
              other than those that are  expressly  made as of a specific  date,
              are true and correct in all material respects with the same effect
              as though such representations and warranties had been made on and
              as of the Effective Date.

10.  Representations  and  Warranties.  Each of the Borrower  and Holdco,  for
itself  and on  behalf  of  each of its  Subsidiaries,  agrees,  represents  and
warrants in favor of the Arrangers,  the Syndication  Agent, the  Administrative
Agent, the Collateral Agent and the Credit Parties that:

(a)           This Amendment has been executed and delivered by duly  authorized
              representatives  of  the  Borrower  and  Holdco,  and  the  Credit
              Agreement, as modified and amended by this Amendment,  constitutes
              a legal,  valid and binding  obligation of the Borrower and Holdco
              and is  enforceable  against the Borrower and Holdco in accordance
              with  its  terms,  except  as  enforceability  may be  limited  by
              bankruptcy,  insolvency,  reorganization or similar laws affecting
              creditors'  rights  generally  and by the  application  of general
              equitable principles;

(b)           Before and after giving effect to this  Amendment,  no Default or
              Event of Default with respect to the Borrower or Holdco has
              occurred and is continuing;

(c)           As of the date  hereof  and  after  giving  effect  to each of the
              AirTouch  Acquisition  and  the  Nextel  2  Acquisition,  (i)  the
              property of the Borrower,  at a fair  valuation on a going concern
              basis, will exceed its debt; (ii) the capital of the Borrower will
              not be unreasonably  small to conduct its business;  and (iii) the
              Borrower will not have incurred  debts,  or have intended to incur
              debts, beyond its ability to pay such debts as they mature;

                                       7
<PAGE>   8

(d)           No event  contemplated  in  connection  with  either the  AirTouch
              Acquisition or the Nextel 2 Acquisition shall occur, which has not
              been consented to or waived,  the occurrence of which constitutes,
              or with the  passage  of time or giving  of  notice or both  would
              constitute,  a material default by Holdco,  the Borrower or any of
              their  respective   Subsidiaries  under  any  material  indenture,
              agreement or other instrument,  including, without limitation, the
              material  Necessary  Authorizations  and  the  Indentures,  or any
              judgment, decree or order, to which Holdco, the Borrower or any of
              their respective  Subsidiaries is a party or by which Holdco,  the
              Borrower or any of their  respective  Subsidiaries or any of their
              respective properties may be bound or affected; and

(e)           All of the  representations  and  warranties  of  Holdco  and  the
              Borrower   contained   in  the  Credit   Agreement   (other   than
              representations  and warranties  that relate solely to a specified
              date) continue to be true and correct in all material  respects as
              of the date hereof as though made on and as of such date.

11.    Counterparts.  This  Amendment  may be executed in any number of separate
counterparts and by the different parties hereto on separate counterparts,  each
of which shall be deemed an original and all of which, taken together,  shall be
deemed to constitute one and the same  instrument.  In proving this Amendment in
any  judicial  proceedings,  it shall not be necessary to produce or account for
more than one such counterpart signed by the party against whom such enforcement
is sought. Any signatures  delivered by a party by facsimile  transmission shall
be deemed an original signature hereto.

12.   Law of Contract.  THIS AMENDMENT SHALL BE CONSTRUED IN ACCORDANCE WITH AND
GOVERNED BY THE INTERNAL  LAWS OF THE STATE OF NEW YORK  APPLICABLE TO CONTRACTS
MADE AND TO BE PERFORMED WHOLLY WITHIN SUCH STATE.

                [REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]

                                       8

<PAGE>   9

                                  SCHEDULE 1.1

The AirTouch  Purchase  Documents  shall  include the  following  documents,  as
amended,  and all  schedules  and  exhibits  thereto and  documents  executed in
connection therewith:

1.       AGREEMENT  TO  SUBLEASE  dated as of  February  16, 2000 by and between
         AirTouch Communications, Inc., a Delaware corporation, Los Angeles SMSA
         Limited     Partnership,     a    California    limited    partnership,
         Oxnard-Ventura-Simi   Limited   Partnership,   a   California   limited
         partnership, as Sublessors, Holdco, and California Tower.

2.       SUBLEASE   dated   as   of   ____________,   2000,   between   AirTouch
         Communications,  Inc., a Delaware corporation,  The Other Parties Named
         Therein as Sublessors,  and California  Tower,  and for purposes of the
         guaranty set forth in Section  26(e) thereof and the covenant set forth
         in Section 26(h) thereof, Holdco (the "Sublease").

3.       SITE  DEVELOPMENT AND  BUILD-TO-SUIT  AGREEMENT dated as of __________,
         2000  by  and  between  AirTouch   Communications,   Inc.,  a  Delaware
         corporation,  ("AirTouch")  and  California  Tower for  purposes of the
         Guaranty   set  forth  in  Section   10.2(c)   thereof,   Holdco   (the
         "Build-To-Suit Agreement").

4.       MASTER TOWER SITE LEASE  AGREEMENT dated as of  ____________,  2000, by
         and between AirTouch Communications, Inc. and California Tower, and for
         purposes of the guaranty set forth in Section 19.D. thereof Holdco (the
         "Master Tower Site Lease").

5.       SITE  MARKETING  AGREEMENT  dated as of February 16, 2000,  between (i)
         AirTouch  Communications,  Inc. and the other entities listed under the
         heading  "Owner" on the signature  pages thereto,  and (ii)  California
         Tower,  and (iii) solely for purpose of Section 24 thereof  Holdco (the
         "Site Marketing Agreement").

6.       ESCROW  AGREEMENT  dated as of February 16, 2000, by and among Airtouch
         Communications,  Inc., a Delaware corporation,  the entities other than
         Air  Touch  which are  listed  under the  heading  "Sublessors"  on the
         signature  pages  thereto,  California  Tower and First Union  National
         Bank, as escrow agent (the "Escrow Agreement")

<PAGE>   10

THIRD AMENDMENT (SPECTRASITE COMMUNICATIONS, INC.)
         IN WITNESS WHEREOF, this Amendment has been duly executed as of the day
and year first written above.

BORROWER:                                       SPECTRASITE COMMUNICATIONS, INC.

                                                By:      /s/  David P. Tomick
                                                         -----------------------
                                                Name:         David P. Tomick
                                                Title:  Executive Vice President

                                                Attest:
                                                Name:
                                                Title:

HOLDCO:                                         SPECTRASITE HOLDINGS, INC.

                                                By:     /s/ David P. Tomick
                                                        ------------------------
                                                Name:       David P. Tomick
                                                Title:  Executive Vice President

                                                Attest:
                                                Name:
                                                Title:

<PAGE>   11

ADMINISTRATIVE                      CANADIAN IMPERIAL BANK OF
AGENT:                                           COMMERCE

                                                By:     /s/ Colleen Risorto
                                                        ------------------------
                                                Name:   Colleen Risorto
                                                Title:  Executive Director
                                              CIBC World Markets Corp. as Agent

<PAGE>   12

ARRANGERS:                          CIBC WORLD MARKETS CORP.
                                                 (f/k/a CIBC Oppenheimer Corp.)

                                                By:     /s/ Colleen Risorto
                                                        ------------------------
                                                Name:   Colleen Risorto
                                                Title:  Executive Director
                                               CIBC World Markets Corp. as Agent

                                                     CREDIT SUISSE FIRST BOSTON

                                               By:     /s/ Bill O'Daly
                                                       -------------------------
                                               Name:   Bill O'Daly
Title:    Vice President

                                               By:     /s/ Robert Hetu
                                                       -------------------------
                                               Name:   Robert Hetu
                                               Title:  Vice President

<PAGE>   13

COLLATERAL AGENT:          CANADIAN IMPERIAL BANK OF COMMERCE

                                               By:     /s/  Colleen Risorto
                                                       -------------------------
                                               Name:   Colleen Risorto
                                               Title:  Executive Director
                                               CIBC World Markets Corp. as Agent

<PAGE>   14

SYNDICATION AGENT:                          CREDIT SUISSE FIRST BOSTON

                                               By:     /s/ Bill O'Daly
                                                       -------------------------
                                               Name:   Bill O'Daly
Title:    Vice President

                                               By:     /s/ Robert Hetu
                                                       -------------------------
                                               Name:   Robert Hetu
                                               Title:  Vice President

<PAGE>   15

MANAGING AGENTS:                    BANK OF MONTREAL, CHICAGO BRANCH

                                               By:     /s/ Karen Klapper
                                                       -------------------------
                                               Name:       Karen Klapper
                                               Title:    Director

                             THE BANK OF NOVA SCOTIA

                                              By: /s/ Vincent J. Fitzgerald, Jr.
                                                  ------------------------------
                                              Name:   Vincent J. Fitzgerald, Jr.
                                              Title:       Authorized Signatory

                            FLEET NATIONAL BANK (f/k/a BankBoston, N.A.)

                                              By:     /s/ Shepard D. Rainie
                                                      --------------------------
                                              Name:      Shephard D. Rainie
                                              Title:        Managing Director

                            DRESDNER BANK AG, NEW YORK AND GRAND CAYMAN BRANCHES

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

                                              By:     /s/ Brian E. Haughney
                                                      --------------------------
                                              Name:      Brian E. Haughney
                                              Title:    Assistant Vice President

                                                  TORONTO DOMINION (TEXAS), INC.

                                              By:     /s/ Ann S. Slanis
                                                      --------------------------
                                              Name:       Ann S. Slanis
                                              Title:    Vice President

                                                  UNION BANK OF CALIFORNIA, N.A.

                                              By:
                                              Name:
                                              Title:

<PAGE>   16

CO-AGENT:                                      CREDIT LYONNAIS NEW YORK BRANCH

                                              By:     /s/  Mark A. Campellone
                                                      --------------------------
                                              Name:  Mark A. Campellone
                                              Title:    First Vice President

<PAGE>   17

LENDERS:                   CIBC INC.

                                              By:     /s/  Colleen Risorto
                                                      --------------------------
                                              Name:         Colleen Risorto
                                              Title:        Executive Director
                                               CIBC World Markets Corp. as Agent

<PAGE>   18

                                                   CREDIT SUISSE FIRST BOSTON

                                              By:     /s/ Bill O'Daly
                                                      --------------------------
                                              Name:   Bill O'Daly
                                              Title:    Vice President

                                              By:     /s/ Robert Hetu
                                                      --------------------------
                                              Name:   Robert Hetu
                                              Title:    Vice President

<PAGE>   19

                                               BANK OF MONTREAL, CHICAGO BRANCH

                                             By:     /s/  Karen Klapper
                                                     ---------------------------
                                             Name: Karen Klapper
                                             Title:    Director

<PAGE>   20

                             THE BANK OF NOVA SCOTIA

                                             By:  /s/ Vincent J. Fitzgerald, Jr.
                                                  ------------------------------
                                             Name:    Vincent J. Fitzgerald, Jr.
                                             Title:         Authorized Signatory

<PAGE>   21

                                    FLEET NATIONAL BANK (f/k/a BankBoston, N.A.)

                                             By:     /s/  Shepard D. Rainie
                                                     ---------------------------
                                             Name:       Shepard D. Rainie
                                             Title:        Managing Director

<PAGE>   22

                            DRESDNER BANK AG, NEW YORK AND GRAND CAYMAN BRANCHES

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

                                            By:     /s/  Brian E. Haughney
                                                    ----------------------------
                                            Name:        Brian E. Haughney
                                            Title:      Assistant Vice President

<PAGE>   23

                                              TORONTO DOMINION (TEXAS), INC.

                                            By:     /s/ Ann S. Slanis
                                                    ----------------------------
                                            Name:    Ann S. Slanis
                                            Title:   Vice President

<PAGE>   24

                                               UNION BANK OF CALIFORNIA, N.A.

                                            By:     /s/  Peter C. Connoy
                                                    ----------------------------
                                            Name:       Peter C. Connoy
                                            Title:         Vice President

<PAGE>   25

                                                 CREDIT LYONNAIS NEW YORK BRANCH

                                            By:     /s./ Mark A. Campellone
                                                    ----------------------------
                                            Name:  Mark A. Campellone
                                            Title:    First Vice President

<PAGE>   26

                              THE BANK OF NEW YORK

                                            By:     /s/  Gerry Granovsky
                                                    ----------------------------
                                            Name:        Gerry Granovsky
                                            Title:       Vice President

<PAGE>   27

                                          CAISSE DE DEPOT ET PLACEMENT DU QUEBEC

                                            By:     /s/  Louis Lavoie
                                                    ----------------------------
                                            Name:         Louis Lavoie
                                            Title:          Manager

                                            By:     /s/ Lucie Rousseau
                                                    ----------------------------
                                            Name:      Lucie Rousseau
                                            Title:        Vice President

<PAGE>   28

                                             CANADIAN IMPERIAL BANK OF COMMERCE

                                            By:     /s/  Colleen Risorto
                                                    ----------------------------
                                            Name:         Colleen Risorto
                                            Title:         Executive Director
                                              CIBC World Markets Corp. as Agent

<PAGE>   29

                                    THE CIT GROUP/EQUIPMENT FINANCING, INC.

                                            By:       /s/ J. E. Palmer
                                                      --------------------------
                                            Name:        J. E. Palmer
                                            Title:    Assistant Vice President

<PAGE>   30

                                               CYPRESSTREE INVESTMENT FUND, LLC

                                            By:   CypressTree Investment
                                                  Management Company, Inc., its
                                                  Managing Member

                                            By:      /s/  Susan Lee
                                                     ---------------------------
                                            Name:        Susan Lee
                                            Title:          Authorized Agent

<PAGE>   31

                                        NORTHAMERICAN SENIOR FLOATING RATE FUND

                                            By:     CypressTree Investment
                                                    Management Company, Inc.,
                                                    its Managing Member

                                            By:
                                            Name:
                                            Title:

<PAGE>   32

                                 CYPRESSTREE INVESTMENT MANAGEMENT COMPANY, INC.

                                As:     Attorney-in-Fact and on behalf of First
                                        Allmerica Financial Life Insurance
                                        Company as Portfolio Manager

                                            By:
                                            Name:
                                            Title:

<PAGE>   33

                              KZH CYPRESSTREE-1 LLC

                                            By:
                                            Name:
                                            Title:

<PAGE>   34

                                             FREMONT INVESTMENT & LOAN

                                            By:
                                            Name:
                                            Title:

<PAGE>   35

                             HELLER FINANCIAL, INC.

                                            By:
                                            Name:
                                            Title:

<PAGE>   36

                                    MERRILL LYNCH SENIOR FLOATING RATE FUND, INC

                                           By:     /s/  Joseph Matteo
                                                   -----------------------------
                                           Name:       Joseph Matteo
                                           Title:       Authorized Signatory

<PAGE>   37

                          PPM AMERICA, INC., as attorney in fact, on behalf of
                          Jackson National Life Insurance Company

                                           By:
                                           Name:
                                           Title:

<PAGE>   38

                         Fleet National Bank (f/k/a BankBoston, N.A.), as Trust
                         Administrator for LONGLANE MASTER TRUST IV

                                            By:
                                            Name:
                                            Title:

<PAGE>   39

                             GALAXY CLO 1999-1, LTD.

                                            By:    SAI Investment Advisor, Inc.,
                                                   its Collateral Manager

                                            By:
                                            Name:
                                            Title:

<PAGE>   40

                                                  OXFORD STRATEGIC INCOME FUND

                                            By:     Eaton Vance Management, as
                                                    Investment Advisor

                                            By:     /s/ Payson F. Swaffield
                                                    ----------------------------
                                            Name:      Payson F. Swaffield
                                            Title:        Vice President

<PAGE>   41

                              SENIOR DEBT PORTFOLIO

                   By:     Boston Management and Research, as Investment Advisor

                                            By:     /s/ Payson F. Swaffield
                                                    ----------------------------
                                            Name:      Payson F. Swaffield
                                            Title:        Vice President

<PAGE>   42

                                        J.H. WHITNEY MARKET VALUE FUND, L.P.

                        By:     J.H. Whitney Value GP, Ltd., its General Partner

                                            By:
                                            Name:
                                            Title:

<PAGE>   43

                                               J.H. WHITNEY MEZZANINE FUND, L.P.

                                By:           Whitney GP, Ltd. - General Partner
                                              ----------------------------------

                                            By:
                                            Name:
                                            Title:

<PAGE>   44

                              BANK OF AMERICA, N.A.

                                            By:
                                            Name:
                                            Title:

<PAGE>   45

                                                 DEBT STRATEGIES FUND II, INC.

                                            By:     /s/ Joseph Matteo
                                                    ----------------------------
                                            Name:        Joseph Matteo
                                            Title:       Authorized Signatory

<PAGE>   46

                                                 DEBT STRATEGIES FUND III, INC.

                                            By:     /s/  Joseph Matteo
                                                    ----------------------------
                                            Name:        Joseph Matteo
                                            Title:       Authorized Signatory

<PAGE>   47

                                         THE FUJI BANK, LIMITED, NEW YORK BRANCH

                                            By:
                                            Name:
                                            Title:

<PAGE>   48

                                                 VAN KAMPEN SENIOR INCOME TRUST

                                            By:
                                            Name:
                                            Title:

<PAGE>   49

                                                  PROSPECT INTERNATIONAL DEBT
                                                  STRATEGY FUND

                                            By:
                                            Name:
                                            Title:

<PAGE>   50

                                              CARAVELLE INVESTMENT FUND L.L.C.

                                            By:
                                            Name:
                                            Title:

<PAGE>   51

                                    EATON VANCE SENIOR INCOME TRUST

                                            By:     /s/ Payson F. Swaffield
                                                    ----------------------------
                                            Name:      Payson F. Swaffield
                                            Title:        Vice President

<PAGE>   52

                                MERRILL LYNCH SENIOR FLOATING RATE FUND II, INC.

                                            By:     /s/  Joseph Matteo
                                                    ----------------------------
                                            Name:         Joseph Matteo
                                            Title:        Authorized Signatory

<PAGE>   53

                                   MORGAN STANLEY DEAN WITTER PRIME INCOME TRUST

                                            By:
                                            Name:
                                            Title:

<PAGE>   54

                                    ELC "Cayman" Ltd. 1999-III

                                            By:
                                            Name:
                                            Title:

<PAGE>   55

                                    SAWGRASS TRADING LLC

                                            By:     /s/ Kelly C. Walker
                                                    ----------------------------
                                            Name:       Kelly C. Walker
                                            Title:         Vice President

<PAGE>   56

                                    BANC OF AMERICA SECURITIES LLC

                                            By:
                                            Name:
                                            Title:

<PAGE>   57

                                    FIRST DOMINION FUNDING III

                                            By:
                                            Name:
                                            Title:

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