The station went on air in 1952. It was founded by entrepreneur John H. Poole as KBIG. Poole had worked at KEZY Anaheim, California, and was founder of channel 22 KBIC-TV in Los Angeles. Later he would own KBIG-FM. Studios were located at the transmitter site on Avalon, later on the mainland coast. From the beginning there were contentious disagreements with co-channel KCBS San Francisco over interference between the stations. Much of the path between stations' wavefronts was over highly conductive seawater. According to Billboard Magazine, Bonneville Communications owned KBRT prior to the sale to Crawford Broadcasting. Bonneville, owned by the Church of Jesus Christ of Latter-day Saints, has dabbled on and off in the Los Angeles radio market. Bonneville also used to own KSWD, "The Sound" at 100.3 FM. After changing call signs from KBIG, KBRT was a mixture of secular and Christian music, with all programming taped, and all song "intros and outros" recorded by professional announcers; there was no live, "on-air" talent until after changing over to a completely Christian music format.
1980s
In 1980, the station switched to the Talk/Christian format after being purchased by Donald Crawford of Crawford Broadcasting when the assets of the original Crawford Broadcasting were split up among the heirs of its founder, evangelist Percy Crawford. Just prior to the switch, KBRT played Contemporary Christian Music from sunrise to sunset. The daily sign-on began with a recording of a man's voice: "Good morning. This is K-B-R-T Avalon, and we now begin another day of broadcasting over Southern California. K-B-R-T radio broadcasts on an assigned frequency of 740 kilohertz with a power output of 10,000 watts by authority of the Federal Communications Commission. K-B-R-T's transmitter was, at the time, located on Santa Catalina Island, and was operated by Kiertron, Incorporated." Air personalities have included Clark Race, Johnny Magnus, Paul McGuire, Rich Buhler, Dave Sebastian Williams and Program Director, Mike Trout. Magnus featured his trademark "Weather With a Beat," where he would list U.S. and world city temperatures to an upbeat instrumental background. A typical background music track for "Weather With a Beat" was Count Basie's version of Neal Hefti's tune, "Cute", featuring Frank Wess on flute. Previously, KBRT was known as KBIG, airing Easy Listening music.
2000s
Contractors cutting a steel antenna cable with a gas-powered circular saw caused the wildfire that began on May 10, 2007. KBRT had to shut down the transmitter, which was not damaged. Until the transmitter was repaired, the station aired only on KBRT740.com. Starting on 19 September 2011, KBRT featured David Housholder, Orange County author and pastor, and Roger Marsh in the 3pm-5pm drive-home slot, with "The Bottom Line", a current events show with features in legal, educational, health, and finance segments, replacing "Talk from the Heart" with Rich Buhler, previously hosted by Paul McGuire. Housholder exited "The Bottom Line" in April 2013. "The Bottom Line" reaches most AM radios in California, since it is syndicated on KCBC 770 AM in the Sacramento/Bay Area region.
