sentences:  The CRTC formally established this exemption in 1993, when the commission allowed CHUM Limited to acquire the radio stations owned by competitor CUC Broadcasting.Blackburn Radio operates one station and has a rebroadcaster of its Chatham station in Windsor, but all other commercial broadcast outlets in the city are owned by Bell Media, which bought CHUM in 2006.In addition to Windsor's own radio stations, virtually all radio stations in the Detroit market are also available in the city, as well as some from Toledo.