SBA Communications Corporation is an independent owner and operator of wireless communications tower structures, rooftops and other structures that support antennas used for wireless communications. The Company's operating segments include site leasing and site development. The site leasing business includes segments, domestic site leasing and international site leasing. The Company's primary business line is its site leasing business. In its site leasing business, the Company leases antenna space to wireless service providers on towers that it owns or operates, and manages rooftop and tower sites for property owners under various contractual arrangements. The Company owns approximately 25,460 towers. It also manages or leases approximately 5,500 actual or potential towers. The Company's other business line is its site development business, through which it assists wireless service providers in developing and maintaining their own wireless service networks.