CHEX, an affiliate of the CBC network, began broadcasting on March 26, 1955, in Peterborough, Ontario, Canada. The first program to be broadcast was an NHL ice hockey game.

It was founded by a media partnership that already published the Peterborough Examiner newspaper and owned radio station CHEX . The partnership included politician Rupert Davies . Since April 13, 2000, it has been owned by Canadian media conglomerate Corus Entertainment.

The main broadcast tower is 1,000 feet (305 m) high, making the top 1,842 feet above sea level.

In the late 1980s, CHEX started broadcasting much of the same programming on UHF channel 22 in Durham Region, but with some region-specific news and other content. Some controversy exists over the existence of a CBC affiliate in Durham Region, as the area is already served by CBLT, the CBC owned-and-operated station in Toronto.