W I T N E S S E T H:

ELEVENTH SUPPLEMENTAL INDENTURE (this “Eleventh Supplemental Indenture”), dated as of August 8, 2014, among Church & Tower, Inc., a Florida corporation (“C&T”), MasTec Brazil I, Inc., a Florida corporation (“Brazil I”), MasTec Brazil II, Inc., a Florida corporation (“Brazil II”), MasTec Latin America, Inc., a Delaware corporation (“Latin America”), MasTec Property Holdings, LLC, a Nevada limited liability company (“Property”), MasTec Services Company, Inc., a Florida corporation (“Services Inc”), MasTec Spain, Inc., a Florida corporation (“Spain”), MasTec Venezuela, Inc., a Florida corporation (“Venezuela”), Nsoro MasTec International, Inc., a Nevada corporation (“Nsoro” and, together with C&T, Brazil I, Brazil II, Latin America, Property, Services Inc, Spain and Venezuela, the “New Guarantors”), MASTEC, INC., a Florida corporation (the “Company”), and U.S. BANK NATIONAL ASSOCIATION, as trustee under the Indenture referred to below (the “Trustee”).

WHEREAS the Company has heretofore executed and delivered to the Trustee an indenture (as amended, supplemented or otherwise modified, the “Indenture”) dated as of June 5, 2009, providing for (i) the issuance by the Company from time to time of its senior debt securities evidencing its unsecured and unsubordinated indebtedness, in an unlimited aggregate principal amount, in one or more series and (ii) the guaranty of such securities by the guarantors party thereto;

WHEREAS the Company has heretofore supplemented the Indenture by, among other things, executing and delivering to the Trustee (i) the Fifth Supplemental Indenture, dated as of March 18, 2013 (the “Fifth Supplemental Indenture”), by and among the Company, the guarantors party thereto and the Trustee, relating to the Company’s 4.875% Senior Notes due 2023 (the “Senior Notes”), (ii) the Sixth Supplemental Indenture, dated as of September 30, 2013, by and among the Company, the guarantors party thereto and the Trustee, relating to the joinder of certain subsidiaries of the Company as subsidiary guarantors, (iii) the Seventh Supplemental Indenture, dated as of November 11, 2013, by and among the Company, the guarantors party thereto and the Trustee, relating to the joinder of certain subsidiaries of the Company as subsidiary guarantors, and (iv) the Tenth Supplemental Indenture, dated as of July 10, 2014, by and among the Company, the guarantors party thereto and the Trustee, relating to the joinder of certain subsidiaries of the Company as subsidiary guarantors;

WHEREAS each of the New Guarantors desires to unconditionally guarantee all the Company’s obligations under the Senior Notes and the Indenture on the terms and conditions set forth herein (the “Guarantee”); and

WHEREAS pursuant to Section 901 of the Indenture and Section 9.01 of the Fifth Supplemental Indenture, the Trustee, the Company and the New Guarantors are each authorized to execute and deliver this Supplemental Indenture.

NOW THEREFORE, in consideration of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, each of the New Guarantors, the Company and the Trustee mutually covenant and agree for the equal and ratable benefit of the holders of the Senior Notes as follows: