Founded in 1922 with call sign KFBC, KLSD is San Diego's oldest licensed radio station.

[2] In September 1926, the Union League Club of San Diego County leased the station full-time from Azbill.

Later that year, physician Arthur Wells Yale bought KFBC and all Union League properties, and the station moved to the Balboa Theatre in downtown San Diego.

[3] At the request of vice president George Bowles, the KFBC call sign was changed to KGB on March 27, 1928.

[3] Then on July 11 that year, the Pickwick Stages System, a transportation company in Los Angeles, bought the station.

KGB began having a slogan "Music for the Sick", reflecting that its programming targeted people who had to stay home due to illness.

The United States Navy broadcast ship signals on the station, and KGB hosted shows originating from the Marine Corps Recruit Depot and Naval Training Center San Diego.

Those shows featured the United States Marine Corps with film stars such as Ginger Rogers and Henry Fonda as special guests.

[3] In this era, KGB was the most popular radio station in San Diego, with local car dealers being the top sponsors.

[3] On December 27, 1950, the General Tire and Rubber Company bought KGB as part of a $12.3 million purchase including all Thomas S. Lee properties and interest in the Mutual Broadcasting System.

[9] Then in 1965, KGB became the first client of the Drake-Chenault consulting company and changed to the Boss Radio Top 40 music format.

[13] In 1972, KGB became an early adopter and pioneer of what is now called the album oriented rock format, simulcasting with co-owned KGB-FM.

[15][9] General manager Jim Price based the format change on anticipation of listeners preferring FM for music.

[20] Beginning in the 2000–01 season, KPOP became the radio home of San Diego State Aztecs men's basketball.

[32] Following the SDRadio.net report, listeners organized and held rallies to attempt to persuade Clear Channel to keep the format.

[34] On November 12, 2007, KLSD flipped to the new format as XTRA Sports 1360, inheriting the former branding from XETRA-AM, which would change its callsign to XEWW a month later.

[47] KLSD was rebranded "1360 the Patriot" beginning September 1 with an all-syndicated lineup including The Glenn Beck Program and The Mark Levin Show.

It shares a broadcasting tower with co-owned KGB-FM and KHTS-FM on 52nd Street in the Oak Park neighborhood of San Diego.

[50] The radio studios and offices are located at the Serra Mesa section of northeastern San Diego.