In April 2007, CHOK AM applied to add an FM transmitter (CHOK-1-FM) at Sarnia to broadcast at 103.3 MHz and simulcast the programing of CHOK 1070 AM, due to AM reception problems from metal and steel associated with the operations from petrochemical plants [REF].
On July 20, 2007 CHOK was given approval in part to broadcast at 100.9 MHz.