It is a non-commercial station, licensed to Toronto, Ontario, and is owned by the Canadian Broadcasting Corporation.

CKO ceased operations in 1989, and the frequency was again vacant until it was assigned to CBLA-FM, co-owned with CBL-FM.)

On February 15, 1979, the CRTC approved the CBC's application to operate a new FM transmitter in Belleville on 94.3 MHz (CBBB-FM)[5] and on May 7, 1979, the CRTC also approved the CBC's application to operate a new FM transmitter in Brockville on 104.9 MHz (CBBA-FM), to rebroadcast the programming originating from CBL-FM Toronto.

[11] On June 28, 2005, the CRTC approved the CBC's application to change the frequency of its transmitter CBL-FM-1 104.7 to 106.9 MHz.

This change of frequency was to eliminate significant interference with a local radio station CFBK-FM operating at 105.5 MHz in Huntsville.