O2 (UK) Telefónica O2 had a long-standing relationship with Arsenal F.C., being their shirt sponsor until the end of the 2005/2006 season. In 2005, a three-year deal was signed that saw Telefónica O2 become the team's exclusive mobile communications partner. O2 were the main sponsor of the Channel 4 reality TV show "Big Brother" from its second series (as BT Cellnet) in 2001 until its fourth series in 2003. They also sponsored the spin-off shows "Celebrity Big Brother 2" in 2002 and "" in 2003. In total O2 sponsored five series of the show. O2 sponsored music festivals, the Wireless Festivals, from
SBA Communications 20,079 towers. The company also managed or leased approximately 4,800 actual or potential towers. In addition, it provides various site development services comprising network pre-design; site audits; identification of potential locations for towers and antennas; support in buying or leasing of the location; assistance in obtaining zoning approvals and permits; tower structure construction; antenna installation; and radio equipment installation, commissioning, and maintenance. SBA Communications Corporation was founded in 1989 and is headquartered in Boca Raton, Florida. The current CEO is Jeffrey A. Stoops. SBA Communications SBA Communications Corporation owns and operates wireless infrastructure, including small cells, indoor/outdoor distributed antenna systems,