KFBG (100.7 FM, "91X") is a commercial radio station that is licensed to San Diego, California and broadcasts a classic alternative format as a simulcast of XETRA-FM (91.1).

It shares studios with LMSD's other stations in the Sorrento Valley section of San Diego, and its transmitter is atop Mount Soledad in La Jolla.

[8][9] In 1964, Transcontinent sold the KFMB/KFMB-FM/KFMB-TV cluster to Midwest Television, a company controlled by the Meyer family and based in Champaign, Illinois, at the time.

[11] In March 1975, KFMB-FM became "B-100" with the slogan "Better Boogie"; Southern California radio writer Richard Wagoner described the new station as a "high-energy screamer [that] went straight for the jugular".

[9][11] B-100's on-air staff during its first two years included "Shotgun" Tom Kelly, Kenny "Beaver Cleaver" Levine, and Bobby Rich under his on air name "Dr.

Other personalities from this era included Gary Kelley, Gene Knight (who moved on to KXSN), Danny Romero (who eventually landed at KABC-TV in Los Angeles), Ellen K. Thomas, and John Fox.

Replacing them were John Landers and Jools Brandt, followed by Larry Himmel, who had also succeeded "Shotgun" Tom Kelly in mornings on B-100 in 1979.

[12] On June 6 at midnight, KFMB-FM relaunched as "Star 100.7" and retained the hot AC format, though with a more current and upbeat focus than B-100.

[13] Star 100.7 was a personality-oriented station, with an initial air staff made up of Shawn Ireland and Donna Davis in mornings, Kim Morrison in middays, Dave Smiley in afternoons, Dominica in evenings, and China More in overnights.

On August 2, 2010, KFMB-FM became home to the former longtime KGB-FM morning show, Dave, Shelly and Chainsaw, often abbreviated The DSC.

On August 2, 2013, KFMB-FM began restricting access to its online stream to listeners within the city of San Diego proper.

[15] This move by program director Mike O'Reilly drew the ire of fans who live outside the city limits, including the large U.S. military community stationed locally and overseas.

O'Reilly explained his rationale, citing a new Arbitron policy on how online listening is measured: Our radio industry is continually adapting to changing metrics, which are sometimes out of our control within our competitive landscape.

I understand your frustration and I can assure you this decision to restrict our streaming efforts to San Diego was based on multiple factors including the licensing issues outlined on our website.

However, in September 2005, KFMB-FM conducted a nationwide search for morning show talent, with the winner receiving a $1-million, five-year contract.

[19][20] On December 26, 2015, at 10 a.m., after playing "Merry Christmas (I Don't Want to Fight Tonight)" by the Ramones, KFMB-FM began stunting with a "Wheel of Formats" — consisting of all-AC/DC, all-Bob Marley, all-1980s hits, all-Van Halen, outlaw country, soft adult contemporary, all-glam metal, all-blues, and adult standards — branded simply as "100.7", with each new format starting every day at 10 a.m.

)[32] On December 30, 2019, Tegna reached an agreement to sell KFMB and KFMB-FM to Local Media San Diego (LMSD) for $5 million, putting them back under common control with its three Mexican-licensed stations.