The studios and offices are located at the Radio City building on Shaw Avenue in North Fresno.

Several nationally syndicated programs are carried at night, including Mark Levin, Armstrong & Getty, Red Eye Radio and America in The Morning from Westwood One, a subsidiary of Cumulus Media, the parent company of KMJ-AM-FM.

Local newscasters are heard at the beginning of most hours, with Fox News Radio carried at night.

KKDJ also brought 1980s concert acts such as The Knack, Huey Lewis and the News, The Motels and The Babys to the Star Palace and Warner's Theatre.

The hip and sexy 1980s cheer team was recruited to promote concerts and other events, hosted by the Breakfast Club.

KKDJ's dominance as a rocker was hurt when 103.7 KMGX changed its format from Top 40 to hard-edged rock in 1989, as KRZR (today KFBT).

In July 2004, the station flipped to a hot talk format known as "The Edge", with the call sign KKDG, and featured Howard Stern's syndicated show in the morning.

The talk format barely made a dent in the ratings; in February 2005, "Viva 106" was temporarily revived, while still running Howard Stern in morning drive time.

Jack-FM was among the highest-rated stations in the Fresno market for several years, due to its large playlist, made up of rock, alternative and pop hits from the past and present, as well as its own unique system of playing these songs at random, hence the slogan, "Playing What We Want".

On August 30, 2013, a deal was announced in which Townsquare Media would purchase Peak Broadcasting, and then immediately swap Peak's Fresno stations, including KMJ-AM-FM, to Cumulus Media in exchange for Cumulus' stations in Dubuque, Iowa, and Poughkeepsie, New York.