September 6, 1920: Radio Station WWJ in Detroit broadcast a prizefight for the first time. In the fight, Jack Dempsey was beaten by his opponent Billy Miske by a KO in round 3 in Benton Harbor, MI On August 20, 1920, The Detroit News formally started the operation of a radio station with the call sign 8MK, a name assigned by the United States Department of Commerce Bureau of Navigation, On October 13, 1921 the station had a limited commercial license and changed the call letters to WBL. On March 3, 1922, the call letters were changed again to WWJ. The call letters are still used today. WWJ is now owned by CBS.