The station is owned by Radio Edmundston Inc. and first went on the air in December, 1944, thus becoming the first French speaking radio station in Canada outside of the province of Quebec. It was originally carried at 1240 kHz, then at 1230 kHz in 1945, then at 1280 in 1952, 570 in 1954, before given approval to switch to 92.7 MHz in 1998. CJEM's rebroadcaster, CKMV, began broadcasting at 1490 kHz in 1974, and was given approval to switch to 95.1 MHz in 2000.
In 1991, CJEM received approval to add transmitters in Clair (95.1 MHz) and Saint-Léonard, New Brunswick (104.3 MHz). In 1995, CJEM was authorized to delete transmitters CJEM-FM-1 Clair and CJEM-FM-2 Saint-Léonard.