Document:

NONCOMPETITION AND CONFIDENTIALITY AGREEMENT

 Exhibit 10.4 
  
 NONCOMPETITION AND CONFIDENTIALITY AGREEMENT 
  
 This Agreement (this “Agreement”) made as of January 1, 2004, by and between American Tower Corporation, a
Delaware corporation (“ATC”), and J. Michael Gearon, Jr. (“Optionee”), an individual residing at
                        . 
  
 WHEREAS, ATC, American Tower International, Inc., a Delaware corporation (“ATC International”), and ATC South America Holding Corp, a Delaware
corporation (“Holding”), are parties to a Stockholder/Optionee Agreement, dated as of January 1, 2004, and of which Optionee executed a counterpart on January 1, 2004 (collectively, the “Stockholder Agreement”), pursuant to which
Holding will issue to Optionee options to purchase shares of its Common Stock, par value $.01 per share; and 
  
 WHEREAS, Optionee is an employee of ATC or one of its subsidiaries and will perform services for Holding; 
  
 NOW, THEREFORE, in consideration of the consummation of the transactions
contemplated by the Stockholder Agreement, the sum of One Dollar ($1.00), the material covenants and agreements contained herein, and other good and valuable consideration, the receipt, adequacy and sufficiency of which are hereby acknowledged, the
parties hereto, intending to be legally bound, do covenant and agree as follows: 
  
 Section 1. Definitions. Terms used in this Agreement which are not defined herein but which are defined in the Stockholder Agreement shall have the respective meanings so defined. 
  
 Confidential Information shall mean any and all information (excluding
information in the public domain other than as a direct or indirect result of any breach by Optionee of the provisions of this Agreement) related to the business, operations, management, assets, property, plans or prospects, condition, financial or
other, or results of operation of ATC, any Affiliate of ATC or any of their respective successors or assigns, including without limitation: 
  

	 	(a)	the whole or any portion or phase of any business plans, financial information, purchasing data, supplier or customer data, accounting data, or computer programs (including source
and object codes), tapes, discs, data, software or other information; 

  

	 	(b)	the whole or any portion or phase of any marketing or sales information or technique, sales records, customer lists, supplier lists, prices, sales projections or other listings of
names, addresses, or telephone numbers, or other sales information; 

  

	 	(c)	the whole or any portion or phase of any employee payroll, fringe benefit, salary, bonus, commission or other form of compensation information and all employee personnel
information, including information relating to performance evaluations, discipline, employee conduct, complaints and other matters relating to employment of any Person; and 

  

	 	(d)	Intellectual Property; 

  
 whether or not any of the foregoing has been made, developed and/or conceived by Optionee or by others in the employ of any such Person. Notwithstanding the foregoing, the term “Confidential Information”
shall not include and information reasonably necessary for the conducting of any activity expressly excluded from the definition of “Proscribed Activity” hereunder. 

 Covered Territory shall mean (a) while Optionee is employed by ATC or any of its Affiliates,
North, South and Latin America, Europe and all other areas in which ATC or any of its Affiliates has invested or proposes to invest; and (b) thereafter, North America and any other markets where Optionee has been or is involved or is negotiating a
proposed investment, acquisition or other transaction on behalf of ATC or any of its Affiliates. 
  
 Good Reason shall mean: 
  

	 	(a)	the assignment to Optionee of any duties inconsistent in any material respect with his current position, authority, duties or responsibilities or any other action by ATC or Holding
or any of their Affiliates that results in a diminution, in any material respect, in such position, authority, duties or responsibilities; or 

  

	 	(b)	a material reduction in Optionee’s compensation or other benefits (taking into account the compensation and other benefits from ATC or Holding and their Affiliates from whom he
may, from time to time, receive compensation), the result of which is to place Optionee in a materially less favorable position as to such compensation and benefits compared to other employees of ATC or Holding and their Affiliates of similar
stature and position; or 

  

	 	(c)	any other failure by ATC or Holding or any of their Affiliates to comply in any material respect with any material provision of the Stockholder Agreement; 

 
 that (i) is incapable of cure, or (ii) has not been cured or remedied promptly (and in any
event within thirty (30) days) after written notice to the board of directors of ATC from Optionee specifying in reasonable detail the nature of such assignment, action, reduction or failure. 
  
 Immediate Family shall mean spouses, children and parents, whether
related by blood, adoption or marriage. 
  
 Intellectual
Property shall mean, with respect to Optionee, any and all research, information, inventions, designs, procedures, developments, discoveries, improvements, patents and applications therefor, trademarks and applications therefor, service marks,
trade names, copyrights and applications therefor, trade secrets, drawing, plans, systems, methods, specifications, computer software programs, tapes, discs and related data processing software (including object and source codes) owned by Optionee
or in which he has an interest and all other manufacturing, engineering, technical, research and development data and know-how made, conceived, developed and/or acquired by Optionee solely or jointly with others during the period of his employment
with ATC or any of its Affiliates or within one year thereafter, which relate to the manufacture, production or processing of any products developed or sold by ATC or any of its Affiliates during the term of this Agreement or which are within the
scope of or usable in connection with ATC’s or any of its Affiliates’ business as it may, from time to time, hereafter be conducted or proposed to be conducted. 
  
 Optionee Forfeiture Event shall mean any of the following acts (other than as a result of the death or Disability of
Optionee) committed by Optionee: 
  
 (a) any
willful or gross failure or refusal to perform, or any willful or gross misconduct in the performance of, any significant portion of his obligations, duties and responsibilities as an 
  

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 employee of Holding, the effect of which has been or reasonably could be expected to materially and
adversely affect the business of ATC or any of its Affiliates, as determined in good faith by the ATC Board of Directors, and that (i) is incapable of cure, or (ii) has not been cured or remedied as promptly as is reasonably possible (and in any
event within thirty (30) days) after written notice from the Holding Board to Optionee specifying in reasonable detail the nature of such failure, refusal or misconduct, or 
  
 (b) material breach of the provisions of Section 2, 3 or 4 of this Agreement which (i) is incapable of cure,
or (ii) has not been cured or remedied promptly (and in any event within thirty (30) days) after written notice from the Holding Board to Optionee specifying in reasonable detail the nature of such breach, or 
  
 (c) Optionee is convicted of, pleads guilty or nolo
contendero to any act of fraud, embezzlement or misappropriation or other crime involving moral turpitude in connection with his employment by Holding or any of its Affiliates intended by Optionee to result in substantial personal enrichment
and which adversely affects the business of ATC or any of its Affiliates, all as determined in good faith by the ATC Board of Directors. 
  
 Proscribed Activity shall mean any and all activities related to (a) the construction, ownership, operation, leasing or management of
telecommunications or broadcast towers, (b) providing network development services or components for wireless service providers or broadcasters, (c) providing high speed Internet access and related services via satellite to foreign-based Internet
service providers, telephone or other telecommunciations companies, and other businesses, or (d) providing other satellite and Internet protocol network transmission services. 
  
 Restricted Period shall mean a period commencing with the date hereof and terminating the latest of (a) one year
after exercise of the put (or call) provided for in Section 6 of the Stockholder Agreement, (b) two years after the sooner to occur of (i) an Optionee Forfeiture Event, or (ii) the resignation by Optionee from all positions with ATC and each of its
subsidiaries other than for Good Reason, or (c) one year after the resignation by Optionee from all positions with ATC and each of its subsidiaries for the reason set forth in paragraph (d) of the definition of Good Reason. 
  
 Section 2. Confidentiality. Optionee shall not, either during the
Restricted Period or thereafter, reveal or disclose to any person outside ATC and its subsidiaries or use for his own benefit, without ATC’s specific prior written authorization, whether by private communication or by public address or
publication or otherwise, any Confidential Information. All originals and copies of any Confidential Information, relating to the business of ATC or any of its subsidiaries, however and whenever produced, shall be the sole property of ATC and its
subsidiaries, not to be removed from the premises or custody of ATC or its subsidiaries without in each instance first obtaining prior written consent or authorization of ATC. 
  
 Section 3. Disclosure and Assignment of Intellectual Property. Optionee shall promptly disclose to ATC and any
successor or assign, and grant to ATC, and its successors and assigns (without any separate remuneration or compensation other than that received by him from time to time in the course of his employment) his entire right, title and interest
throughout the world in and to all Intellectual Property. It is understood and agreed that Optionee has heretofore disclosed to ATC, and assigned to it, all Intellectual Property now known to him over which he has any control. Optionee agrees to
execute all appropriate patent applications securing all United States and foreign patents on all Intellectual Property, and to do, execute and deliver any and all acts and instruments that may be necessary or proper to vest all Intellectual
Property in ATC or its nominee or designee and to enable ATC, or its nominee or designee, to obtain all such patents; and Optionee agrees to render to ATC, or its nominee or designee, all such 
  

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 reasonable assistance as it may require in the prosecution of all such patent applications and applications for the
reissue of such patents, and in the prosecution or defense of all interferences which may be declared involving any of said patent applications or patents, but the expense of all such assignments and patent applications, or all other proceedings
referred to herein above, shall be borne by ATC. Optionee shall be entitled to fair and reasonable compensation for any such assistance requested by ATC or its nominee or designee and furnished by him after the termination of his employment.

  
 Section 4. Restriction. ATC through its subsidiaries
intends to continue and expand the business heretofore conducted by it and them and it and in connection therewith ATC and its subsidiaries have invested and may in the future be required to invest substantial sums of money, directly or indirectly,
and as Optionee recognizes that ATC would be substantially injured by Optionee disclosing to others, or by Optionee using for his own benefit, any Intellectual Property or any other Confidential Information he has obtained or shall obtain from ATC
or any of its subsidiaries, or which he may now possess and which he has made available to ATC or any of its subsidiaries, Optionee agrees that during the Restricted Period: 
  

	 	(a)	Neither he nor any member of his Immediate Family will be interested, directly or indirectly, as an investor in any other Entity, business or enterprise within the Covered
Territory, which is engaged in any Proscribed Activity (except as an investor in securities (i) issued by ATC or any of its subsidiaries or (ii) listed on a national securities exchange or actively traded over the counter so long as such investments
are in amounts not significant as compared to his total investments and do not exceed one percent (1%) of the outstanding securities of the issuer of the same class or issue); and 

  

	 	(b)	Other than in connection with his serving as an employee of ATC and its subsidiaries, he will not, directly or indirectly, for his own account or as employee, officer, director,
partner, trustee, principal, member, joint venturer, agent, adviser, consultant or otherwise, engage within the Covered Territory, in any phase of any Proscribed Activity. 

  
 Optionee further agrees that during the Restricted Period, he will not, directly or indirectly, solicit business for a
Proscribed Activity from any Person, business or enterprise which is, or proposes to be, a customer of ATC or any of its subsidiaries or any of their respective successors or assigns, or from any Person, business or enterprise with which ATC or any
of its subsidiaries or any of their respective successors or assigns is negotiating or holding discussion or to which it has made a proposal at the time of such termination, induce any such Person, business or enterprise not to undertake, or to
curtail or cancel business with ATC or any of its subsidiaries or any of their respective successors or assigns, induce or attempt to induce any employee of ATC or any of its subsidiaries or any of their respective successors or assigns to terminate
his employment therewith, or intentionally divulge or utilize for the direct or indirect benefit (financial or other) of himself or any other Person, business or enterprise, any Intellectual Property or any Confidential Information he has obtained
as an employee and/or stockholder of ATC or any of its subsidiaries. 
  
 This Agreement shall be deemed to consist of a series of separate covenants, one for each line of business carried on by ATC and its subsidiaries and each region included within the geographic areas referred to in this Section. Optionee and
ATC are of the belief that the Restricted Period, the Proscribed Activity and the Covered Territory herein specified are reasonable, in light of the circumstances as they exist on the date upon which this Agreement has been executed, including
without limitation the nature of the business in which ATC and its subsidiaries are engaged and proposes to engage, the state of their product development and Optionee’s knowledge of such business and his prior affiliations with and interest in
ATC. However, if such period, activity or area should be adjudged unreasonable in any Legal Action, whether at law or in equity, then the Restricted Period shall be reduced by such period of time, the 
  

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 Proscribed Activity shall be reduced by such activities, or the Covered Territory shall be reduced by such area, or any
combination thereof, as are deemed unreasonable, so that this covenant may be enforced in such area, with respect to such activities and during such period of time as is adjudged to be reasonable. 
  
 Section 5. Security for Optionee Obligations. Optionee’s
obligations under this Agreement shall be secured by twenty percent (20%) of the gross sale proceeds (before deduction of commissions, discounts, brokerage fees or other fees and expenses) of (a) all shares of capital stock and other securities
issued by Holding to Optionee, and (b) all shares of capital stock and other securities issued by Holding received by Optionee pursuant to any distribution to him or otherwise acquired by him. Optionee and ATC agree that all such proceeds shall be
held by an escrow agent or agents reasonably acceptable to Optionee and ATC and subject to the terms and conditions of an escrow agreement to be executed by ATC and Optionee and reasonably satisfactory to ATC and Optionee. 
  
 Section 6. Miscellaneous Provisions. 
  
 (a) Assignment; Successors and Assigns. In the event that ATC shall
be merged with, or consolidated into, any other Entity, or in the event that it shall sell and transfer substantially all of its assets to another Entity, the terms of this Agreement shall inure to the benefit of, and be assumed by, the Entity
resulting from such merger or consolidation, or to which ATC’s assets shall be sold and transferred. This Agreement shall not be assignable by Optionee, but it shall be binding upon his heirs, executors, administrators and legal representatives
to the extent they constitute members of his Immediate Family. Nothing in this Agreement expressed or implied is intended to and shall not be construed to confer upon or create in any person (other than the parties hereto and their permitted
successors and assigns) any rights or remedies under or by reason of this Agreement. 
  
 (b) Specific Performance; Other Rights and Remedies. Optionee recognizes and agrees that ATC’s remedy at law for any breach of the provisions of this Agreement, including without limitation Sections 2, 3,
or 4, would be inadequate, and he agrees that for breach of such provisions, ATC shall, in addition to such other remedies as may be available to it at law or in equity or as provided in this Agreement, be entitled to injunctive relief and to
enforce its rights by an action for specific performance to the extent permitted by applicable law. Without limiting the generality of the foregoing, in the event of a breach or threatened breach by Optionee of the provisions of this Agreement, ATC
shall be entitled to an injunction restraining Optionee from soliciting employees, customers or suppliers, or from disclosing, in whole or in part, any Confidential Information, or from rendering any services to any Person to whom such information
has been disclosed, or is threatened to be disclosed, from engaging, participating or otherwise being connected with any business described in Section 4 or from otherwise violating the terms of this Agreement. Nothing herein contained shall be
construed as prohibiting each party from pursuing any other remedies available to it pursuant to the provisions of, and subject to the limitations contained in, this Agreement for such breach or threatened breach; provided, however, that none of the
parties shall pursue, and each party hereby waives, any punitive, indirect, special, incidental, exemplary, consequential or similar damages arising out of this Agreement (including without limitation damages for diminution in value and loss of
anticipated profits) and the multiplied portion of damages. 
  
 (c) Entire Agreement. This Agreement constitutes the entire agreement between ATC and Optionee with respect to the subject matter hereof, and supersedes all prior agreements, arrangements, covenants, promises, conditions,
understandings, inducements, representations and negotiations, expressed or implied, oral or written, among them as to such subject matter. 
  
 (d) Waivers; Amendments. Any provision of this Agreement to the contrary notwithstanding, changes in or additions to this Agreement may be made, or
compliance with any term, covenant, agreement, condition or provision set forth herein may be omitted or waived (either generally or in a 
  

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 particular instance and either retroactively or prospectively) with, but only with, the consent in writing of the parties
hereto. Any consent may be given subject to satisfaction of conditions stated therein. The failure to insist upon the strict provisions of any covenant, term, condition or other provision of this Agreement or to exercise any right or remedy
thereunder shall not constitute a waiver of any such covenant, term, condition or other provision thereof or default in connection therewith. The waiver of any covenant, term, condition or other provision thereof or default thereunder shall not
affect or alter this Agreement in any other respect, and each and every covenant, term, condition or other provision of this Agreement shall, in such event, continue in full force and effect, except as so waived, and shall be operative with respect
to any other then existing or subsequent default in connection therewith. 
  
 (e) Notices. All notices and other communications which by any provision of this Agreement are required or permitted to be given shall be given in writing and shall be effective (i) five (5) days after being
mailed by first-class, express mail, postage prepaid, (ii) the next day when sent by overnight by recognized mail courier service, (iii) upon confirmation when sent by telex, telegram, telecopy or other similar form of rapid transmission, confirmed
by mailing (by first class or express mail, postage prepaid, or recognized overnight mail courier service) written confirmation at substantially the same time as such rapid transmission, (iv) upon delivery personally delivered to an officer of the
receiving party, or (v) upon delivery personally delivered to the Optionee. All such communications shall be mailed, set or delivered as set forth below or at such other addresses as the party entitled thereto shall have designated by notice as
herein provided. 
  
 (i) if to Holding or ATC, at
116 Huntington Avenue, Boston, Massachusetts 02116 Attention: Chief Executive Officer and Chief Financial Officer, Telecopier No.: (617) 375-7575 with a copy (which shall not constitute notice to ATC or Holding) to Sullivan & Worcester LLP, One
Post Office Square, Boston, Massachusetts 02109, Attention: William J. Curry, Esq., Telecopier No.: (617) 338-2880) and 
  
 (ii) if to Optionee, at 3200 Cobb Galleria Parkway, Suite 205, Atlanta, GA 30339, Telecopier No. (770) 952-4999. 
  
 (f) Severability. If any provision of this Agreement shall be held or
deemed to be, or shall in fact be, invalid, inoperative, illegal or unenforceable as applied to any particular case in any jurisdiction or jurisdictions, or in all jurisdictions or in all cases, because of the conflicting of any provision with any
constitution or statute or rule of public policy or for any other reason, such circumstance shall not have the effect of rendering the provision or provisions in question invalid, inoperative, illegal or unenforceable in any other jurisdiction or in
any other case or circumstance or of rendering any other provision or provisions herein contained invalid, inoperative, illegal or unenforceable to the extent that such other provisions are not themselves actually in conflict with such constitution,
statute or rule of public policy, but this Agreement shall be reformed and construed in any such jurisdiction or case as if such invalid, inoperative, illegal or unenforceable provision had never been contained herein and such provision reformed so
that it would be valid, operative and enforceable to the maximum extent permitted in such jurisdiction or in such case, except when such reformation and construction could operate as an undue hardship on either party, or constitute a substantial
deviation from the general intent and purpose of such party as reflected in this Agreement. The parties shall endeavor in good faith negotiations to replace the invalid, inoperative, illegal or unenforceable provisions with valid, operative, legal
and enforceable provisions the economic effect of which comes as close as possible to that of the invalid, inoperative, illegal or unenforceable provisions. 
  
 (g) Counterparts. This Agreement may be executed in several counterparts, each of which shall be deemed an original, but all of which together
shall constitute one and the same instrument, binding upon all the parties hereto. In pleading or proving any provision of this Agreement, it shall not be necessary to produce more than one of such counterparts. 
  

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 (h) Section Headings. The headings contained in this Agreement are for reference purposes only and
shall not in any way affect the meaning or interpretation of this Agreement. 
  
 (i) Governing Law. The validity, interpretation, construction and performance of this Agreement shall be governed by the applicable laws of the United States of America and the domestic substantive laws of the
State of Georgia without giving effect to any choice or conflict of laws provision or rule that would cause the application of domestic substantive laws of any other jurisdiction. Anything in this Agreement to the contrary notwithstanding, in the
event of any dispute between the parties which results in a Legal Action, the prevailing party shall be entitled to receive from the non-prevailing party reimbursement for reasonable legal fees and expenses incurred by such prevailing party in such
Legal Action. 
  
 (j) Further Acts. Each party agrees that
at any time, and from time to time, before and after the consummation of the transactions contemplated by this Agreement, it will do all such things and execute and deliver all such agreements, assignments, instruments, other documents and
assurances, as any other party or its counsel reasonably deems necessary or desirable in order to carry out the terms and conditions of this Agreement and the transactions contemplated hereby or to facilitate the enjoyment of any of the rights
created hereby or to be created hereunder. 
  
 (k) Gender.
Whenever used herein the singular number shall include the plural, the plural shall include the singular, and the use of any gender shall include all genders. 
  

(l) Consultation with Counsel; No Representations. Optionee agrees and acknowledges that he has had a full and complete opportunity to consult
with counsel of his own choosing concerning the terms, enforceability and implications of this Agreement, and that ATC has made no representations or warranties to him concerning the terms, enforceability or implications of this Agreement other than
as are reflected in this Agreement. 
  
 IN WITNESS WHEREOF, the
parties hereto have executed this Noncompetition and Confidentiality Agreement, all pursuant to authority heretofore granted, as of the date and year first above written. 
  

			
	American Tower Corporation
		
	By:	 	 /s/

	Name:	 	 
	Title:	 	 
		
	 	 	 /s/ J. Michael Gearon, Jr.

	 	 	Optionee
	 	 	J. Michael Gearon, Jr.

  

 - 7 –LETTER AGREEMENT BETWEEN COMPANY, J. MICHAEL GEARON AND ALL OTHER STOCKHOLDERS

 Exhibit 10.5 
  
 American Tower Corporation 
 116 Huntington Ave. 
 Boston, MA 02116 
  
 April 2, 2004 
  
 Michael Gearon 
 [Each Stockholder party to the Stockholder Agreement]

  

	 	Re:	Stockholder/Optionee Agreement 

  
 Reference is hereby made to the Stockholder/Optionee Agreement, dated October 11, 2001 (the “Stockholder Agreement”), among ATC Mexico
Holding Corp. (“Holding”), American Tower International, Inc. (“ATC International”), American Tower Corporation (“ATC”), J. Michael Gearon, Jr. (“Gearon”), and each of the persons
who has executed a counterpart to the Stockholder Agreement (individually a “Stockholder” and collectively the “Stockholders” which terms shall include Gearon in his capacity as such). Unless otherwise indicated,
capitalized terms used herein have the meanings assigned to them in the Stockholder Agreement. The parties agree as follows: 
  
 1. Holding Value. Notwithstanding anything to the contrary in the Stockholder Agreement, the value of the Holding Securities shall be Fifty Eight
Million Six Hundred Thousand Dollars ($58,600,000.00), as calculated in accordance with Exhibit A attached to this letter agreement. 
  
 2. Payment of Gearon Put/Call Price. The closing with respect to the put of the Holding Securities owned by Gearon shall occur on April 2, 2004 or
such other date as ATC and Gearon reasonably agree (the “Gearon Closing Date”). On the Gearon Closing Date, ATC shall elect, in its sole discretion, whether to pay Gearon, subject to Section 6 of this letter agreement, in cash or in shares
of ATC Common Stock or some combination thereof. Any shares of ATC Common Stock issued to Gearon as payment hereunder shall be fully paid and nonassessable and shall be valued at the negotiated price of $11.30 per share. 
  
 3. Payment of Other Stockholder Put/Call Price. The closing with
respect to the put of the Holding Securities owned by the other Stockholders shall occur within ten (10) business days of the applicable Put Date or such other date as ATC and the applicable other Stockholder reasonably agree (each an “Other
Stockholder Closing Date”). On each Other Stockholder Closing Date, ATC shall elect, in its sole discretion, whether to pay the applicable other Stockholder, subject to Section 6 of this letter agreement, in cash or in shares of ATC Common
Stock or some combination thereof. Any shares of ATC Common Stock issued to any other Stockholder as payment hereunder shall be fully paid and nonassessable and shall be valued at the negotiated price of $11.30 per share, regardless of the date that
the respective Stockholder 

 exercises his put. If ATC elects to pay cash to any other Stockholder pursuant to this Section 3, the amount and other
terms of such cash payment shall be mutually agreeable to ATC and such other Stockholder. 
  
 4. Exercise of Put. The parties acknowledge that Gearon exercised his put right on January 13, 2004. The parties also acknowledge that all of the Stockholders other than Gearon exercised their right to acquire
shares of Holding Common Stock on January 13, 2004. Notwithstanding anything to the contrary in Section 6(a) of the Stockholder Agreement or otherwise, all Stockholders other than Gearon shall have the right to require ATC to purchase any amount of
Holding Common Stock, in part or in full, held by such Stockholder at any time after July 14, 2004. 
  
 5. Registration of Shares. Should Gearon exercise his rights to register his shares of ATC Common Stock pursuant to the ATC Registration Rights
Agreement, each of the other Stockholders shall have the right to require ATC to register a sufficient number of shares of ATC Common Stock that have been or will be granted to such Stockholder in exchange for Holding Securities. Those shares will
be reserved for the Stockholders for payment for their Holding Securities. 
  
 6. Holdback of Certain Amounts. With respect to the exercise of any put right prior to January 13, 2005, ATC shall withhold the final twenty percent (20%) of the net consideration (i.e., after deducting the
amount paid by such Stockholder for his Holding Securities in the form of cash or promissory note) payable to any Stockholder in exchange for his Holding Securities (the “Holdback Amount”). Any Holdback Amount may be offset and
reduced on a dollar-for-dollar basis, following written notice from ATC to the Stockholders to such effect, by the dollar amount of any reduction in Holding Value (determined in accordance with the procedures set forth in the Stockholder Agreement)
directly attributable to an Iusacell Material Adverse Event. An “Iusacell Material Adverse Event” shall mean any order, decree, bankruptcy proceeding, concurso mercantile proceeding or judgment of any Governmental Authority that is in
effect, or any proceeding that is commenced for purposes of obtaining such an order, or any other material adverse change in the business, operating results or financial condition of Iusacell Celular, S.A. de C.V. (“Iusacell”), in
each case that restrains, materially delays, restructures or prohibits (or reasonably could be expected to result in restraining, materially delaying, restructuring or prohibiting) the payment of rent by Iusacell to ATC’s Mexican subsidiaries
(collectively, “ATC Mexico”); provided, however, that as long as ATC Mexico continues to receive rent payments from or on behalf of Iusacell, and that such rent payments are reasonably expected to continue being made,
no Iusacell Material Adverse Event shall be deemed to have occurred. The Holdback Amount shall be delivered to each Stockholder that fully exercises his put right prior to January 13, 2005, as promptly as practicable following January 13, 2005. To
the extent that the parties agree that any Holdback Amount shall be retained by ATC following January 13, 2005 because of a diminution in Holding Value resulting from an Iusacell Material Adverse Event, each Stockholder shall relinquish his right to
that portion of the final twenty percent (20%) of the net consideration payable to such Stockholder in exchange for his Holding Securities by which the Holding Value was reduced. To the extent that ATC is made whole for a Iusacell Material Adverse
Event at any point in the future, any Holdback Amount shall be paid to the Stockholder from which it was previously withheld. 
  

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 7. Gearon Holdback Amount. With respect to the Holdback Amount attributable to the Holding
Securities owned by Gearon, ATC shall pay cash to Gearon to satisfy the amount, if any, payable to Gearon pursuant to Section 6 of this letter agreement, together with interest on such amount computed from April 2, 2004 until paid at an annual rate
of 7%. 
  
 This letter agreement shall be governed by and construed in accordance
with the laws of the Commonwealth of Massachusetts. 
  
 The parties hereto agree
to execute and deliver any further documents or assurances that are necessary, desirable or proper to consummate the transactions contemplated by this letter agreement and carry out the intent and purposes hereof. 
  
 [Signatures Pages Follow] 
  

 3 

 Please acknowledge your agreement to the foregoing by signing this letter in the space provided below. 
  

			
	
	AMERICAN TOWER CORPORATION
		
	By:	 	 /s/ Bradley E. Singer

	Name:	 	Bradley E. Singer
	Title:	 	Chief Financial Officer and Treasurer
	
	 AMERICAN TOWER INTERNATIONAL INC.

		
	By:	 	 /s/ Bradley E. Singer

	Name:	 	Bradley E. Singer
	Title:	 	Treasurer
	
	 ATC MEXICO HOLDING CORP.

		
	By:	 	 /s/ Bradley E. Singer

	Name:	 	Bradley E. Singer
	Title:	 	 

  

			
		
	Agreed and Accepted by the Stockholders:	 	 
		
	J. MICHAEL GEARON, JR.	 	 /s/ J. Michael Gearon, Jr.

		
	WILLIAM H. HESS	 	 /s/ William H. Hess

		
	GUY HAMILTON EARGLE	 	 /s/ Guy Hamilton Eargle

		
	KEVIN CORRIGAN	 	 /s/ Kevin Corrigan

		
	LAWRENCE GLEASON	 	 /s/ Lawrence Gleason

		
	MURILLO PENCHEL	 	 /s/ Murillo Penchel

		
	JEFF SMITH	 	 /s/ Jeff Smith

		
	DEEMER DANA	 	 /s/ Deemer Dana

		
	DAN BROOKS	 	 /s/ Dan Brooks

  

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