The transmitter is atop Mount Wilson alongside most L.A. based television and FM radio stations.

[3] Noted radio programmer Gordon McLendon bought KGLA in the 1960s, changing the call letters in November 1966 to KADS.

[4] McLendon, with permission from the Federal Communications Commission, experimented with an all-advertisement format, hence the call sign choice.

KOST, with its call sign pronounced "coast" in a stage whisper, continued its easy listening format through the 1970s.

In the early 1980s, KOST gradually added more vocals, and on November 15, 1982, the station switched to an adult contemporary format, signing on with "You Can Do Magic" by America as its first song.

(In 2014, the company's name was changed to iHeartMedia, Inc.) Over the years, particularly in the late 2000s and into the 2010s, the station would shift to a more upbeat mainstream AC format.

In October 2008, former KYXY San Diego radio personality Kristin Cruz joined Mark Wallengren as co-host of KOST's morning show.

Mark Wallengren, who had been part of the KOST morning show since 1986, moved to afternoons, replacing Bruce Scott, who had been with station since 2012.

[citation needed] In early February, the station's HD3 signal went dark and the Air1 feed moved to a subchannel on co-owned KHHT (92.3 FM).