Jazz (1959–1960) A sister station to existing
AM station
KFMB (760 AM) under the ownership of Transcontinent Television Corporation, the station
signed on as KFMB-FM on 100.7
FM on September 21, 1959, initially with a
jazz format. A previous KFMB-FM station signed on in April 1947 and broadcast until 1950 on 101.5 MHz.
Beautiful music (1960–1975) By the summer of 1960, KFMB-FM transitioned to
beautiful music, which the station described as the "golden sound of refined musical fare". 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. In the late 1960s, the format was called "Music only for a woman"; station manager Eddie "Ed" Peters bought the rights to
syndicate the format. Soon after, Peters left and started his own jingle company, Peters Productions, which syndicated the format on
reel-to-reel tape to over 100 stations during the 1960s and 1970s, changing the name of the format to "Music just for the two of us".
Top 40 (1975–1994) Following the trend of FM radio stations taking on
top 40 formats in the early 1970s, KFMB
program director Bobby Rich and station manager Paul Palmer decided to launch a top 40 station on KFMB-FM to challenge market leader
KCBQ (1170 AM). 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. Boogie". 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. 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. Later on, the station's air staff consisted of Jeff and Jer (who returned in May 1997) in mornings, Anita Rush in middays,
XHRM-FM morning hosts Jagger and Kristi in afternoons (after they left for
KMYI in 2002, they would be replaced with Gregg Simms, Jen Sewell and Sara Kiani), and Ricky Lopez at nights (who would later be replaced with a repeat of Jeff and Jer dubbed
Jeff and Jer Primetime). The station also aired the
Bob and Sheri syndicated morning drive show in the early morning hours for a brief period in late 2004 and early 2005 (the show broadcasts from
Charlotte, North Carolina in the
Eastern Time Zone).
Adult hits (2005–2014) "Star 100.7" continued until April 6, 2005, at 9:55 a.m., when the station began stunting with a five-minute ticking clock and a mysterious voice saying "closer...closer", which ended with an alarm going off and a female announcer saying "Bye Star". At that point, "
Jack FM" and its
adult hits format was introduced with
R.E.M.'s "
It's The End of the World As We Know It (And I Feel Fine)". Jeff and Jer left KFMB-FM in August 2005 and moved across town to KMYI (94.1 FM), now known as "Star 94.1". 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. 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: KFMB-FM achieved this effect by restricting the signal based on the IP address of the mobile phone on which a listener streamed the station. However, fans within the city of San Diego were prevented from hearing the station as well. In addition, the station charged for access to its local morning radio show on podcast in September 2013.
Morning shows on Jack FM Typically, Jack FM stations do not have disc jockeys. However, in September 2005, KFMB-FM conducted a nationwide search for morning show talent, with the winner receiving a $1-million, five-year contract. The station chose
Hispanic comedian
Monique Marvez and former Star 100.7 DJs Greg and Sara. The show was called
Monique and the Man; Greg was the 'Man' and Sara was a co-host. The show started on January 23, 2006, and ended in 2009. KFMB-FM had no morning show until
Dave, Shelly and Chainsaw took over on August 2, 2010. The show, previously on KGB-FM, helped boost the station's morning ratings.
Rock (2015–2018) On October 6, 2015, Midwest Television announced that it had entered into a joint operating agreement with Local Media San Diego LLC, which operates three stations
licensed to
Tijuana but broadcasting in English for the San Diego
media market:
XETRA-FM (91.1 FM),
XHITZ-FM (90.3 FM), and
XHRM-FM (92.5 FM). The five stations formed an entity known as SDLocal, which was intended to "preserve the local ownership and operation of San Diego's top-rated radio stations". With the sale, the
paywall was lifted off the station's website, allowing the station to be heard outside San Diego once more. On November 17, 2015, KFMB-FM began airing an all-
Christmas music format for the holiday season as "Jack Frost". On December 8, Garrett Michaels, formerly program director at XETRA-FM, was named to the same position at KFMB-FM. With the announcement, there were possible hints of an upcoming format change. While
Dave, Shelly and Chainsaw was usually ranked in first place among morning-drive programs, particularly among listeners 25–54 years old, KFMB-FM overall was ranked #17 in the December 2015 Nielsen Audio ratings report for the San Diego market. 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. The stunt lasted until January 4, when the station settled on a
mainstream rock format consisting of a mix of classic rock and 1970s—1980s
new wave hits. This was branded as "100.7 KFM-BFM", a nod to how the station referred to its call letters in the 1980s. Midwest Television and Local Media San Diego ended the SDLocal joint operating agreement at the end of 2016. In October 2017, San Diego television station
KUSI-TV reported that KFMB/KFMB-FM/KFMB-TV were being offered for sale by Midwest Television. On December 18, 2017,
Tegna, Inc. announced it would purchase the KFMB stations for $325 million; the deal marked Tegna's re-entry into radio, as predecessor
Gannett Company had sold its previous radio group to
Evergreen Media in 1997. The sale was completed on February 15, 2018. The last edition of
Dave, Shelly and Chainsaw aired July 19, 2018. The hosts' contracts were set to expire at the end of the month, but KFMB-FM failed to reach new deals with hosts Dave Rickards and Cookie "Chainsaw" Randolph. Shelly Dunn had announced her retirement from radio the previous week.
Adult hits (2018–2025) In December 2018, KFMB-FM flipped back to
adult hits as "100.7 San Diego". In January 2019, it was announced that Chris Cantore (coming from
KBZT) would begin hosting mornings. (Former KFMB studios owner Elisabeth Kimmel was later arrested on March 12, 2019, for her role in the infamous
2019 college admissions scandal, with conspiracy to commit
mail fraud and honest services mail fraud to boost her son's college admission credentials for pole vaulting.) 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. The deal broke up the KFMB station cluster after 60 years and did not include the rights to the KFMB call letters. Local Media entered into a 10-year lease of the transmitter site on
Mount Soledad as part of the sale. On January 28, 2020, ahead of the closure, it was announced that the entire airstaff would be exiting on February 7, 2020, which was when they expected the sale to be closed. However, it was later revealed that their staff would remain in place through at least February 14; regulatory approval of the sale faced delays due to several factors, including the required publication of
public notices of the proposal being delayed due to an "inadvertent scheduling oversight". The sale was ultimately approved on March 12, 2020, and was completed on March 17, 2020; while KFMB was immediately divested to
iHeartMedia, no immediate changes were disclosed for KFMB-FM, other than a planned relocation to LMSD's
Sorrento Valley studios. On April 6, 2020, the station's call sign was changed to KFBG. On April 13, at noon, the station rebranded as "100.7 Big FM", featuring what it said was "a bigger music library". The studios also relocated to Sorrento Valley. Initially, the station aired without any DJs, but a morning personality was hired in December 2020. In April 2022, the frequency reached #1 in the Nielsen Audio Ratings for the first time since 1988.
Regional Mexican (2025) In December 2024, the station was sold by Local Media San Diego to
Lotus Communications. The "Big FM" adult hits format ended at 7p.m. on January 31, 2025, following a half-hour block of departure-themed songs (ending with "
Mexican Radio" by
Wall of Voodoo - a subtle nod to both its soon-to-be former sister stations that are licensed to Mexico, and to the fact Lotus operates primarily
regional Mexican, or otherwise Spanish-language, formatted stations). KFBG then switched to a temporary simulcast of XETRA-FM while awaiting
Federal Communications Commission approval for the sale. Its airstaff remained with LMSD. (LMSD also intended to keep the KFBG callsign, specifically mandating in the announcement of the move they wanted to keep it with the sale, which would've forced 100.7 to change callsigns with the move, and would've seemingly hinted at an eventual revival of the "Big" brand on another local frequency. This did not come to pass, and the station still retains the callsign as of 2026 as a result.) Afternoon host Garett Michaels was transferred to XETRA-FM as its new morning host, while morning host Corey Dylan moved to XHITZ-FM as its midday host. The sale to Lotus closed in late April. On May 1, KFBG flipped to
Regional Mexican, branded as "Frontera 100.7." The station will feature the syndicated "Don Cheto Al Aire" in mornings. ==References==