The Denver Broncos kick off their preseason Thursday night on the road to face off against the Chicago Bears. Broncos head coach Vance Joseph announced that Trevor Siemian would start the preseason opener at Chicago, with Paxton Lynch starting the second preseason game against the San Francisco 49ers on August 19th. Again this year 55 Country (AM 550), the official Denver Broncos station for Northwest Colorado, will broadcast the Broncos games to fans across the region. Catch tomorrow night’s preseason opener beginning with the pregame at 4:05. Kickoff will be at 6.