Crown Castle International Corp. engages in the ownership, operation, and management of wireless communications sites in the United States and Australia. The company primarily leases antenna space to various carriers operating cellular, personal communications services, enhanced specialized mobile radio, 3G, wireless data services, paging, and other networks. It also provides certain network services to its customers, including initial antenna installation and subsequent augmentation; site acquisition, site development, and construction; network design; and site selection, site management, and other services. As of December 31, 2005, Crown Castle International owned, leased, or managed...