AT&T is considering a sale of its wireless towers, reports Bloomberg. AT&T said earlier this year that it might sell its towers. AT&T could net about $5 billion from such a sale, and possible bidders include Crown Castle International, SBA Communications, and American Tower, according to Bloomberg's unidentified source.AT&T owns and operates about 10,000 towers throughout the country, which generate approximately $326 million in annual revenue thanks to other companies that lease space on the towers.