The station signed on August 1, 1947 as WQDI. It was Quincy Newspapers' first broadcasting station, signing on five months before WGEM; it was also the first FM station in the market. The WQDI callsign was retained until 1953, when the station became WGEM-FM to match the AM station and WGEM-TV.
For much of its early history, WGEM-FM was a simulcast of WGEM. This ended by 1976, when the station implemented a country music format; "Gem Country" lasted until 2002, when it gave way to the current news/talk format.