Crown Castle International Corp., through its subsidiaries, engages in the ownership, operation, and leasing of towers and other communications structures in the United States and internationally. The company primarily leases and licenses antenna space of its towers to wireless communication companies. It also offers network services, such as antenna installations , network design and site selection, site acquisition, and site development. Crown Castle serves communications industries, including cellular; personal communications services; enhanced specialized mobile radio; third generation; wireless data; paging; fixed point-to-point radio; and point to multipoint broadcasting, such as radio and television broadcasting.