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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
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 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 SpHGtSTLm+WcDSbBBVtoicTU7WC0jn08YrQm+tnIbYZz+9nra3TUvPIPHLvOcuKF
 6Y00kWMgmpiDnll7koQzZg==

<SEC-DOCUMENT>0001180955-03-000040.txt : 20031117
<SEC-HEADER>0001180955-03-000040.hdr.sgml : 20031117
<ACCEPTANCE-DATETIME>20031117170432
ACCESSION NUMBER:		0001180955-03-000040
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20031113
FILED AS OF DATE:		20031117

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			AMERICAN TOWER CORP /MA/
		CENTRAL INDEX KEY:			0001053507
		STANDARD INDUSTRIAL CLASSIFICATION:	COMMUNICATION SERVICES, NEC [4899]
		IRS NUMBER:				650723837
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		116 HUNTINGTON AVE
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116
		BUSINESS PHONE:		6173757500

	MAIL ADDRESS:	
		STREET 1:		116 HUNTINGTON AVE
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	AMERICAN TOWER SYSTEMS CORP
		DATE OF NAME CHANGE:	19980128

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			GEARON J MICHAEL JR
		CENTRAL INDEX KEY:			0001060571
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-14195
		FILM NUMBER:		031008556

	BUSINESS ADDRESS:	
		STREET 1:		116 HUNTINGTON AVE
		STREET 2:		AMERICAN RADIO SYSTEMS CORP
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116
		BUSINESS PHONE:		6173757500

	MAIL ADDRESS:	
		STREET 1:		AMERICAN RADIO SYSTEMS CORP
		STREET 2:		116 HUNTINGTON AVE
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02116
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
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    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType><periodOfReport>2003-11-13</periodOfReport>
    <issuer>
        <issuerCik>0001053507</issuerCik>
        <issuerName>AMERICAN TOWER CORP /MA/</issuerName>
        <issuerTradingSymbol>AMT</issuerTradingSymbol></issuer><reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001060571</rptOwnerCik>
            <rptOwnerName>GEARON J MICHAEL JR</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>116 HUNTINGTON AVENUE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOSTON</rptOwnerCity>
            <rptOwnerState>MA</rptOwnerState>
            <rptOwnerZipCode>02116</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
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- -11-13</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>S</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionAmounts><transactionShares><value>1200</value></transactionShares><transactionPricePerShare><value>11.67</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>D</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>582345</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value></directOrIndirectOwnership><natureOfOwnership><value>By Partnership</value></natureOfOwnership></ownershipNature></nonDerivativeTransaction><nonDerivativeTransaction><securityTitle><value>Class A Common Stock</value></securityTitle><transactionDate><value>2003-11-13</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>S</tr
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artnership</value></natureOfOwnership></ownershipNature></nonDerivativeTransaction><nonDerivativeTransaction><securityTitle><value>Class A Common Stock</value></securityTitle><transactionDate><value>2003-11-13</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>S</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionAmounts><transactionShares><value>2400</value></transactionShares><transactionPricePerShare><value>11.75</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>D</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>565245</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value></directOrIndirectOwnership><natureOfOwnership><value>By Partnership</value></natureOfOwnership></ownershipNature></nonDerivativeTransaction><nonDerivativeTransaction><securit
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<transactionCoding><transactionFormType>4</transactionFormType><transactionCode>S</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionAmounts><transactionShares><value>1800</value></transactionShares><transactionPricePerShare><value>11.84</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>D</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>563045</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value></directOrIndirectOwnership><natureOfOwnership><value>By Partnership</value></natureOfOwnership></ownershipNature></nonDerivativeTransaction><nonDerivativeTransaction><securityTitle><value>Class A Common Stock</value></securityTitle><transactionDate><value>2003-11-13</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>S</transactionCode><equitySwapInvolve
d>0</equitySwapInvolved></transactionCoding><transactionAmounts><transactionShares><value>1100</value></transactionShares><transactionPricePerShare><value>11.85</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>D</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>561945</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value></directOrIndirectOwnership><natureOfOwnership><value>By Partnership</value></natureOfOwnership></ownershipNature></nonDerivativeTransaction><nonDerivativeTransaction><securityTitle><value>Class A Common Stock</value></securityTitle><transactionDate><value>2003-11-13</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>S</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionAmounts><transactionShares><value>600</value></transactionSha
res><transactionPricePerShare><value>11.89</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>D</value></transactionAcquiredDisposedCode></transactionAmounts><postTransactionAmounts><sharesOwnedFollowingTransaction><value>561345</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value></directOrIndirectOwnership><natureOfOwnership><value>By Partnership</value><footnoteId id="F1"/></natureOfOwnership></ownershipNature></nonDerivativeTransaction><nonDerivativeHolding><securityTitle><value>Class A Common Stock</value></securityTitle><postTransactionAmounts><sharesOwnedFollowingTransaction><value>452</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>I</value></directOrIndirectOwnership><natureOfOwnership><value>By Partnership</value><footnoteId id="F2"/></natureOfOwnership></ownershipNature></nonDerivativeHolding><nonDerivativeHolding><securityTitle><value
>Class A Common Stock</value></securityTitle><postTransactionAmounts><sharesOwnedFollowingTransaction><value>727911</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></nonDerivativeHolding></nonDerivativeTable><footnotes><footnote id="F1">Shares of Class A Common Stock held by JMG Partners L.P.</footnote><footnote id="F2">Shares of Class A Common Stock held by Gearon Sibling/Nibling Partners, L.P.</footnote></footnotes><remarks>
This Form 4 is the second of two being filed to report sales of Class A Common Stock on November 13, 2003 by JMG Partners L.P., a partnership affiliated with Mr. Gearon.  This Form 4 reports total sales of 34,600 shares of Class A Common Stock.

2 of 2 Forms 4.</remarks><ownerSignature><signatureName>J. Michael Gearon, Jr.</signatureName><signatureDate>2003-11-17</signatureDate></ownerSignature></ownershipDocument>

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</SEC-DOCUMENT>
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