CFGX-FM is a Canadian radio station, which broadcasts at 99.9 FM in Sarnia, Ontario. The station broadcasts a current/recurrent-based adult contemporary format with the brand name The Fox. As with many mainstream ACs in Canada, CFGX has a "hotter" and "brighter" sound than American stations with the same format, thus positioning it in-between U.S.-based competitors WGRT and adult top 40 station WBTI.
CFGX-FM can be heard in the eastern parts of Michigan and used to have a listenable signal in much of Macomb County before Detroit's WCHB-AM signed on an FM translator at 99.9. The station can be heard as far east as London and Chatham to the south.
The station was launched with the callsign CJFI on 14 September 1981 by Rogers Communications, the owner of the city's existing CKJD. The station adopted its current call sign on 26 February 1988.
CKJD and CJFI were sold to Maclean-Hunter subsidiary Blue Water Broadcasting on 16 July 1987. When Rogers acquired Maclean-Hunter on 19 December 1994, the Blue Water stations were spun off to Blackburn Radio.
In July 2008, the station applied to increase power. That application was approved on September 3, 2008.