CHUM, branded as TSN Radio 1050, broadcasting at 1050 kHz in the AM band, is a Canadian radio station licensed to Toronto, Ontario. The station is owned and operated by Bell Media. CHUM's studios are co-located with TSN at 9 Channel Nine Court in the Agincourt neighbourhood of Scarborough (with auxiliary studios located at 250 Richmond Street West in the Entertainment District of downtown Toronto), with its transmitter array located in the Clarkson neighbourhood of Mississauga (near CFRB's own transmitter array). In April 2011, CHUM reverted to a sports format as TSN Radio 1050.