In April 2007, CHOK applied to add an FM transmitter (CHOK-1-FM) at Sarnia to broadcast at 103.3 MHz and simulcast the programming of CHOK, due to AM reception problems from metal and steel associated with the operations from petrochemical plants.

[4] Another company, Points Eagle Radio, had applied at the same time to use the 103.3 MHz frequency to broadcast Aboriginal programing.

[7] CHOK began testing of its 103.9 FM transmitter atop the Kenwick Building in downtown Sarnia, on June 18.

On the morning of July 23, CHOK signed on as Country 103.9 FM and would continue to simulcast its signal on 1070 AM.

[8] The station also has a low-power license-exempt repeater on 101.5 FM at the Progressive Auto Sales Arena.