Existing Tower Agreement

Existing Tower Agreement. Means that certain Master Collocation Sublease Agreement, dated March 10, 2000, as amended by that certain First Amendment to Master Sublease Agreement dated December 31st, 2004, between Sprint Spectrum L.P. and Clearwire LLC, its parent affiliates and subsidiaries, whereby Clearwire Corporation and its Affiliates may elect to sublease tower space on Towers owned by Sprint Nextel or its Affiliates.