SBA Communications Corporation is an independent owner and operator of wireless communications infrastructure including towers, buildings, rooftops, distributed antenna systems (DAS) and small cells. Its primary focus is the leasing of antenna space on its multi-tenant towers to a variety of wireless service providers under long-term lease contracts in the United States, South America, Central America, Canada, and Africa. Its segments include Domestic Site Leasing, International Site Leasing and Site Development. The Domestic Site Leasing segment leases to T-Mobile, AT&T Wireless, and Verizon Wireless. It owns over 17,464 sites in the United States and its territories. The International Site Leasing segment owns and operates over 22,285 towers in 13 international markets throughout South America, Central America, Canada, and Africa. Site development services include network pre-design; site audits; tower and related site construction; support in leasing of the location, and others.