SEC Form 5
FORM 5

[ ] Check this box if no longer
subject to Section 16. Form 4 or Form
5 obligations may continue.
See Instruction 1(b).

[ ]Form 3 Holdings Reported
[ ]Form 4 Transactions Reported
 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C.  20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility
Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940
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1. Name and Address of Reporting Person*
Singer, Bradley     E.
(Last)                      (First)                      (Middle)
116 Huntington Avenue

(Street)
Boston, MA     02116
(City)                      (State)                      (Zip)
2. Issuer Name and Ticker or Trading Symbol

American Tower Corporation   (AMT)
6. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

                        Director                           10% Owner
           X          Officer                             Other

Officer/Other
Description           Chief Financial Officer and Treasurer
7. Individual or Joint/Group
    Filing (Check Applicable Line)

X   Individual Filing
      Joint/Group Filing
3. I.R.S. Identification
    Number of Reporting
    Person, if an entity
    (voluntary)
4. Statement for
    Month/Day/Year

    December 31, 2002

5. If Amendment,
    Date of Original
    (Month/Day/Year)
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security
    (Instr. 3)
2. Transaction Date
    (Month/Day/Year)
2A. Deemed
      Execution
      Date, if any

      (Month/Day/Year)
3. Transaction
    Code
    (Instr. 8)
 4. Securities Acquired (A) or Disposed (D) Of
    (Instr. 3, 4, and 5)



        Amount      |         A/D         |         Price          
5. Amount of
    Securities
    Beneficially
    Owned at
    End of
    Issuer's Fiscal
    Year

    (Instr. 3 and 4)
6. Owner-
    ship
    Form:
    Direct(D)
    or
    Indirect (I)

    (Instr. 4)
7. Nature of
     Indirect
     Beneficial
     Ownership

    (Instr. 4)








If the form is filed by more than one reporting person, see instruction 4(b)(v).
Persons who respond to the collection of information contained in this form are not required to
respond unless the form displays a currently valid OMB control number.
(over)
SEC 2270 (7-02)
Singer, Bradley E. - December 31, 2002
Form 5 (continued)
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security
    (Instr. 3)
2. Conver-
    sion or
    Exercise
    Price of
    Deri-
    vative
    Security
3. Transaction
    Date

    (Month/
    Day/
    Year)
3A. Deemed
      Execution
      Date, if
      any

      (Month/
      Day/
      Year)
 4. Transaction
    Code
 5. Number of Derivative
    Securities Acquired (A)
    or Disposed (D) Of

    (Instr. 3,4 and 5)
6. Date Exercisable(DE) and
    Expiration Date(ED)
    (Month/Day/Year)





  (DE)     |     (ED)  
7. Title and Amount of
    Underlying Securities
    (Instr. 3 and 4)
8. Price
    of
    Derivative
    Security
    (Instr.5)
 9. Number of
    Derivative
    Securities
    Beneficially
    Owned
    at End of
    Year
    (Instr.4) 		10.
Owner-
ship
Form of
Deriv-
ative
Security:
Direct
(D)
or
Indirect
(I)
(Instr.4) 		11. Nature of
      Indirect
      Beneficial
      Ownership
      (Instr.4)
Option to purchase Class A Common Stock
 $5.91 01/18/2002

A
     (A) 200,000
(1) | 01/18/2012
 Class A Common Stock - 200,000
200,000
D
Option to purchase Class A Common Stock
 $3.15 06/14/2002

A
     (A) 60,000
(2) | 06/14/2012
 Class A Common Stock - 60,000
60,000
D












Explanation of Responses :


** Intentional misstatements or omissions of facts constitute Federal Criminal Violations.
        See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note:   File three copies of this Form, one of which must be manually signed. If space is insufficient,
            see Instruction 6 for procedure.

Potential persons who are to respond to the collection of information contained in this form are not
required to respond unless the form displays a currently valid OMB number. 		/s/ Bradley E. Singer                   02-10-2003    
** Signature of Reporting Person                         Date



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Singer, Bradley E. - December 31, 2002
Form 5 (continued)
FOOTNOTE Descriptions for American Tower Corporation (AMT)

Form 5 - December 2002

Bradley E. Singer
116 Huntington Avenue

Boston, MA 02116
Explanation of responses:

(1)   This option was granted pursuant to the 1997 Stock Option Plan, as amended, and is exercisable in 25% cumulative annual increments beginning January 18, 2003.
(2)   This option was granted pursuant to the 1997 Stock Option Plan, as amended, and is exercisable in 25% cumulative annual increments beginning June 14, 2003.
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