PROSPECTUS SUPPLEMENT NO. 6
(To Prospectus dated February 9, 2001)

                           SPECTRASITE HOLDINGS, INC.
                     6 3/4% SENIOR CONVERTIBLE NOTES DUE 2010

     This  prospectus  supplement  no. 6 supplements  and amends the  prospectus
dated  February 9, 2001, as  supplemented  by prospectus  supplement no. 1 dated
February 20, 2001,  prospectus  supplement no. 2 dated March 7, 2001, prospectus
supplement no. 3 dated March 15, 2001,  prospectus  supplement no. 4 dated March
26, 2001 and prospectus  supplement  no. 5 dated April 6, 2001,  relating to the
resale of SpectraSite's 6 3/4% senior  convertible notes due 2010 and the shares
of SpectraSite common stock, par value $.001 per share, issuable upon conversion
of the notes.

     The table and footnotes on pages 35 through 38 of the  prospectus set forth
information  with respect to the selling  holders and the respective  amounts of
convertible  notes held and shares of common  stock  beneficially  owned by each
selling holder that may be offered  pursuant to the prospectus,  as supplemented
and amended. This prospectus  supplement amends the table in the prospectus,  as
supplemented and  amended,  by (i) adding  South Dakota  Retirement  System  and
Lipper Convertibles,  L.P. (Series B), (ii) removing Allstate Insurance Company,
Allstate Life Insurance Company,  Amaranth  Securities L.L.C.,  DEAM Convertible
Arbitrage Fund,  Lancer  Securities  Cayman LTD, Paloma Securities LLC, PGEP III
LLC and The Grable Foundation,  and (iii) replacing the information contained in
the table for Alta Partners  Holdings,  LDC,  CIBC World  Markets  International
Arbitrage and for the category "Any other holder of notes or future  transferee,
pledgee,  donee or successor of any holder" with the  corresponding  information
set forth below.


                                                                                                      

                                                                        Shares of
                                                                         Common
                                             Principal    Principal       Stock      Shares of     Shares of
                                              Amount      Amount of   Beneficially    Common     Common Stock
                                             of Notes    Notes Owned      Owned        Stock     Beneficially
                                             Owned and    After the     Prior to      Offered     Owned After
         Selling Securityholders              Offered     Offering      Offering      Hereby     the Offering
---------------------------------------     ----------   -----------  ------------   ---------  --------------
Alta Partners Holdings, LDC............      6,000,000      none         278,261      278,261          none
CIBC World Markets International
  Arbitrage (1)........................     11,900,000      none      10,551,885      551,885    10,000,000
Lipper Convertibles, L.P. (Series B)...        581,000      none          26,945       26,945          none
South Dakota Retirement System.........      3,000,000      none         139,131      139,131          none
Any other holder of notes or future
  transferee, pledgee, donee or
  successor of any holder (2)..........     57,801,000      none       2,680,627    2,680,627          none

(footnotes on following page)



     The prospectus,  together with this prospectus supplement no. 6, prospectus
supplement  no. 5,  prospectus  supplement no. 4,  prospectus  supplement no. 3,
prospectus  supplement no. 2 and prospectus  supplement no. 1,  constitutes  the
prospectus  required to be delivered by Section  5(b) of the  Securities  Act of
1933, as amended,  with respect to offers and sales of the convertible notes and
the common stock issuable upon conversion of the convertible notes.

     Prospective  investors should carefully review "Risk Factors"  beginning on
page 5 of the  prospectus  for a discussion  of risks that should be  considered
when investing in the notes or our common stock.

     Neither the  Securities and Exchange  Commission  nor any state  securities
commission has approved or  disapproved  of these  securities or passed upon the
adequacy  or  accuracy  of  this  prospectus  or  any  accompanying   prospectus
supplement. Any representation to the contrary is a criminal offense.

           The date of this prospectus supplement is April 20, 2001.






(1)  CIBC World  Markets  International  Arbitrage  is an  affiliate of Canadian
     Imperial  Bank  of  Commerce.   Of  the  10,551,885   shares   reported  as
     beneficially   owned  by  CIBC  World  Markets   International   Arbitrage,
     10,000,000  are held by  other  affiliates  of  Canadian  Imperial  Bank of
     Commerce.  An affiliate of Canadian  Imperial Bank of Commerce,  CIBC World
     Markets,  was an initial  purchaser or  placement  agent for our 12% senior
     discount notes due 2008, our 11 1/4% senior discount notes due 2009, our 12
     7/8% senior  discount notes due 2010, our 10 3/4% senior notes due 2010 and
     our 12 1/2% senior notes due 2010. CIBC World Markets was also a co-manager
     of our public  common stock  offerings in February  2000 and July 2000.  In
     addition,  CIBC  World  Markets  is an agent and a lender  under our credit
     facility. CIBC World Markets and its affiliates received customary fees for
     these services. The Trimaran group purchased 4,000,000 shares of our common
     stock in a private  placement  at a purchase  price of $18.75 per share and
     received warrants to purchase  1,500,000 shares of common stock at exercise
     prices ranging from $21.56 per share to $28.00 per share. Certain investors
     in the Trimaran group are affiliates of CIBC World Markets. Andrew R. Heyer
     is a Managing  Director  of CIBC  World  Markets  and a managing  member of
     Trimaran Fund Management,  L.L.C.,  the investment advisor to Trimaran Fund
     II L.L.C. Mr. Heyer was a member of Holdings' board of directors from April
     1999 until November 2000. Our stockholders' agreement, as amended, provides
     that so long as the Trimaran  group and Canadian  Imperial Bank of Commerce
     and their  respective  affiliates own  collectively 5% or more of Holdings'
     outstanding  stock,  Canadian  Imperial  Bank of  Commerce  affiliates  and
     Caravelle  Investment  Fund,  L.L.C.  collectively  will  have the right to
     designate  a  representative  to  attend  meetings  of  Holdings'  board of
     directors as an observer.

(2)  We may from time to time include additional selling holders and information
     about such selling holders' plans of distribution in future  supplements to
     the prospectus,  if required.  The amounts provided assume that any holders
     of the notes, or any future transferees,  pledgees, donees or successors of
     or from any such other holders of notes, do not beneficially own any common
     stock other than the common stock issuable upon  conversion of the notes at
     the conversion rate.

                                       2




     The following table sets forth, as of April 20, 2001, information regarding
the  beneficial  ownership  of the notes  and our  common  stock by the  selling
holders. The information is based on information provided by or on behalf of the
selling holders through April 20, 2001.


                                                                                                      

                                                                        Shares of
                                                                         Common
                                             Principal    Principal       Stock      Shares of     Shares of
                                              Amount      Amount of   Beneficially    Common     Common Stock
                                             of Notes    Notes Owned      Owned        Stock     Beneficially
                                             Owned and    After the     Prior to      Offered     Owned After
         Selling Securityholders            Offered(1)   Offering(2)    Offering   Hereby(3)(4) the Offering(2)
---------------------------------------     ----------   -----------  ------------ ------------ ----------------
AIG SoundShore Opportunity Holding Fund
  Ltd. ................................    $ 1,000,000      none          46,377       46,377          none
AIG SoundShore Strategic Holding Fund
  Ltd. ................................      5,000,000      none         231,885      231,885          none
Alpine Associates......................      5,600,000      none         259,711      259,711          none
Alpine Partners, L.P. .................        900,000      none          41,740       41,740          none
Alta Partners Holdings, LDC............      6,000,000      none         278,261      278,261          none
Bank America Pension Plan..............      4,000,000      none         185,508      185,508          none
British Virgin Islands Social Security
  Board................................         49,000      none           2,273        2,273          none
CIBC World Markets International
  Arbitrage (5)........................     11,900,000      none      10,551,885      551,885    10,000,000
Deephaven Domestic Convertible Trading
  Ltd. (6).............................      3,000,000      none         139,131      139,131          none
Deeprock & Co. ........................      2,500,000      none         115,943      115,943          none
Deutsche Banc Alex. Brown (7)..........     11,367,000      none       2,614,298      527,166     2,087,132
DIA High Yield Bond Fund (8)...........        250,000      none          11,595       11,595          none
Eaton Vance High Income Portfolio (9)..      2,860,000      none         132,638      132,638          none
Eaton Vance Income Fund of Boston (10).      1,540,000      none          71,421       71,421          none
First Union International Capital
  Markets..............................      5,000,000      none         231,885      231,885          none
Global Bermuda Limited Partnership.....      2,900,000      none         134,493      134,493          none
Hallmark Master Trust High Yield (11)..        250,000      none          11,595       11,595          none
JMG Capital Partners, LP...............      3,500,000      none         162,319      162,319          none
JMG Triton Offshore Fund, Ltd. ........      3,500,000      none         162,319      162,319          none
KBC Financial Products USA.............      2,100,000      none          97,392       97,392          none
Lakeshore International Ltd. ..........      4,100,000      none         190,145      190,145          none
Lehman Brothers Inc. (12)..............      1,000,000      none          46,377       46,377          none
Lipper Convertibles, L.P. .............     11,367,000      none         527,166      527,166          none
Lipper Convertibles, L.P. (Series B)...        581,000      none          26,945       26,945          none
Lipper Convertibles Series II, L.P. ...      2,000,000      none          92,754       92,754          none
Lipper Offshore Convertibles, L.P. ....      2,000,000      none          92,754       92,754          none
Lipper Offshore Convertibles, L.P. #2..      1,000,000      none          46,377       46,377          none
Merced Partners Limited Partnership....      5,000,000      none         231,885      231,885          none
Merrill Lynch Insurance Group..........        334,000      none          15,490       15,490          none
Morgan Stanley & Co. Incorporated (13).      5,251,000      none       7,790,910      243,525     7,547,385
Nomura Securities International, Inc. .      1,000,000      none          46,377       46,377          none
Peoples Benefit Life Insurance
  Company..............................      4,000,000      none         185,508      185,508          none
Peoples Benefit Life Insurance Company
  TEAMSTERS............................      6,000,000      none         278,261      278,261          none
Quattro Fund, LLC......................      3,500,000      none         162,319      162,319          none
Retail Clerks Pension Trust............      2,500,000      none         115,943      115,943          none
Retail Clerks Pension Trust #2.........      1,500,000      none          69,566       69,566          none
St. Albans Partners Ltd................      4,000,000      none         185,508      185,508          none
South Dakota Retirement System.........      3,000,000      none         139,131      139,131          none
TIAA-CREF Mutual Funds
  F/B/O its High Yield Bond Fund (14)..        250,000      none          11,595       11,595          none
TQA Master Plus Fund, LTD..............        500,000      none          23,189       23,189          none
TQA Master Fund, LTD...................      2,000,000      none          92,754       92,754          none
Teachers Insurance and Annuity
  Association..........................      6,000,000      none         278,261      278,261          none
UBS O'Connor LLC F/B/O UBS Global
  Equity Arbitrage Master Ltd..........      2,000,000      none          92,754       92,754          none
Volkswagen of America Inc.--
  Salaried Eaton Vance Mgt. (15).......        100,000      none           4,638        4,638          none

Any other holder of notes or future
  transferee, pledgee, donee or
  successor of any holder (16).........     57,801,000      none       2,680,627    2,680,627          none
----------


(1)  Assumes  that the full  amount of the notes held by the  selling  holder is
     being offered for registration hereunder.

(2)  Because the selling holders may,  pursuant to the prospectus,  offer all or
     some portion of the notes and shares they  presently  hold or, with respect
     to shares,  have the right to acquire  upon  conversion  of such notes,  we

                                       3


     cannot  predict the amount or  percentage of the notes and shares that will
     be held by the  selling  holder  upon  termination  of any such  sales.  In
     addition,  the selling holders identified above may have sold,  transferred
     or  otherwise  disposed of all or a portion of their notes and shares since
     the date on which they provided the  information  regarding their notes and
     shares in  transactions  exempt from the  registration  requirements of the
     Securities  Act. See "Plan of  Distribution."  The selling holders may sell
     all, part or none of the notes or shares  listed in the table.  The amounts
     listed  in the  table  assume  that each  selling  holder  sells all of its
     convertible notes and/or shares of common stock underlying such notes.

(3)  Assumes  that the full  amount of the notes held by the  selling  holder is
     converted into shares of common stock at the  conversion  price and offered
     hereunder by such selling holder.

(4)  The conversion  price and the number of shares  issuable upon conversion of
     the notes are  subject  to  adjustment  under  certain  circumstances.  See
     "Description of  Notes--Conversion of Notes." Section 15.3 of the indenture
     governing the convertible  notes provides that if any fractional  shares of
     common stock are issuable upon conversion of the notes, Holdings may either
     pay cash in lieu of such fractional shares or round up the number of shares
     issuable  upon  conversion.  The  number  of shares  reported  in the table
     assumes  that  Holdings   rounds  up  the  number  of  shares  issued  upon
     conversion.  We  expressly  reserve  the  right  to pay  cash  in  lieu  of
     fractional  shares, and any decision as to whether pay cash or round up for
     fractional  shares will be made at the time the notes are  surrendered  for
     conversion.

(5)  CIBC World  Markets  International  Arbitrage  is an  affiliate of Canadian
     Imperial  Bank  of  Commerce.   Of  the  10,551,885   shares   reported  as
     beneficially   owned  by  CIBC  World  Markets   International   Arbitrage,
     10,000,000  are held by  other  affiliates  of  Canadian  Imperial  Bank of
     Commerce.  An affiliate of Canadian  Imperial Bank of Commerce,  CIBC World
     Markets,  was an initial  purchaser or  placement  agent for our 12% senior
     discount notes due 2008, our 11 1/4% senior discount notes due 2009, our 12
     7/8% senior  discount notes due 2010, our 10 3/4% senior notes due 2010 and
     our 12 1/2% senior notes due 2010. CIBC World Markets was also a co-manager
     of our public  common stock  offerings in February  2000 and July 2000.  In
     addition,  CIBC  World  Markets  is an agent and a lender  under our credit
     facility. CIBC World Markets and its affiliates received customary fees for
     these services. The Trimaran group purchased 4,000,000 shares of our common
     stock in a private  placement  at a purchase  price of $18.75 per share and
     received warrants to purchase  1,500,000 shares of common stock at exercise
     prices ranging from $21.56 per share to $28.00 per share. Certain investors
     in the Trimaran group are affiliates of CIBC World Markets. Andrew R. Heyer
     is a Managing  Director  of CIBC  World  Markets  and a managing  member of
     Trimaran Fund Management,  L.L.C.,  the investment advisor to Trimaran Fund
     II L.L.C. Mr. Heyer was a member of Holdings' board of directors from April
     1999 until November 2000. Our stockholders' agreement, as amended, provides
     that so long as the Trimaran  group and Canadian  Imperial Bank of Commerce
     and their  respective  affiliates own  collectively 5% or more of Holdings'
     outstanding  stock,  Canadian  Imperial  Bank of  Commerce  affiliates  and
     Caravelle  Investment  Fund,  L.L.C.  collectively  will  have the right to
     designate  a  representative  to  attend  meetings  of  Holdings'  board of
     directors as an observer.

(6)  Deephaven  Domestic  Convertible  Trading Ltd. owned  $2,000,000  aggregate
     principal amount of Holdings' 12 1/2% senior discount notes due 2010.

(7)  Deutsche Banc  Alex.Brown  was a co-lead  underwriter  of our public common
     stock  offering in July 2000 and a  co-manager  of our public  common stock
     offering in February 2000. Deutsche Banc was also a placement agent for our
     12 7/8% senior  discount  notes due 2010 and our 10 3/4%  senior  notes due
     2010.

(8)  DIA High Yield Bond Fund owned  $2,750,000  aggregate  principal  amount of
     Holdings' 11 1/4% senior discount notes due 2009.

(9)  Eaton Vance High Income  Portfolio  owned  $5,360,000  aggregate  principal
     amount of  Holdings'  12%  senior  discount  notes  due  2008,  $25,500,000
     aggregate  principal  amount of Holdings' 11 1/4% senior discount notes due
     2009 and $3,870,000  aggregate principal amount of Holdings' 12 7/8% senior
     discount notes due 2010.

(10) Eaton Vance  Income Fund of Boston  owned  $1,150,000  aggregate  principal
     amount of  Holdings'  12%  senior  discount  notes  due  2008,  $12,235,000
     aggregate  principal  amount of Holdings' 11 1/4% senior discount notes due
     2009 and $4,080,000  aggregate principal amount of Holdings' 12 7/8% senior
     discount notes due 2010.

                                       4


(11) Hallmark  Master  Trust High Yield owned  $1,550,000  of  Holdings' 11 1/4%
     senior discount notes due 2009.

(12) Lehman  Brothers Inc. was an initial  purchaser of our 12% senior  discount
     notes due 2008 and a co-manager  of our public  common  stock  offerings in
     February 2000 and July 2000.

(13) Morgan  Stanley  &  Co.  Incorporated  was  the  placement  agent  for  the
     convertible  notes.  Morgan Stanley & Co.  Incorporated was also an initial
     purchaser  or  placement  agent for our 11 1/4% senior  discount  notes due
     2009,  our 12 7/8%  senior  discount  notes due 2010 and our 10 3/4% senior
     notes due 2010 and was  co-lead  underwriter  of our  public  common  stock
     offerings in February 2000 and July 2000.

(14) TIAA-CREF  Mutual  Funds  F/B/O its High  Yield  Bond Fund  owned  $250,000
     aggregate  principal  amount of Holdings' 12 1/2% senior discount notes due
     2010.

(15) Volkswagen  of America  Inc.--Salaried  Eaton Vance Mgt.  owned  $15,000 of
     Holdings' 11 1/4% senior discount notes due 2009.

(16) We may from time to time include additional selling holders and information
     about such selling holders' plans of distribution in future  supplements to
     the prospectus,  if required.  The amounts provided assume that any holders
     of the notes, or any future transferees,  pledgees, donees or successors of
     or from any such other holders of notes, do not beneficially own any common
     stock other than the common stock issuable upon  conversion of the notes at
     the conversion rate.

                                       5