KOSF
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| City | San Francisco, California |
|---|---|
| Broadcast area | San Francisco/Oakland/San Jose, California |
| Branding | iHeart '80s @ 103.7 |
| Slogan | 80s Music For the Bay Area |
| Frequency | 103.7 MHz (also on HD Radio) |
| Repeater(s) | 103.7 KOSF-FM2 (Pleasanton) |
| First air date | November 3, 1947 (as KGO-FM) |
| Format | Analog/HD1: All-'80s hits HD2: Business News (KNEW simulcast) |
| ERP | 6,400 watts |
| HAAT | 403 meters (1,322 ft) |
| Class | B |
| Facility ID | 65484 |
| Callsign meaning | K Oldies San Francisco (former branding) |
| Former callsigns | KGO-FM (1947–71) KSFX (1971–82) KGO-FM (1982–84) KLOK-FM (1984–87) KKSF (1987–2012) |
| Owner |
iHeartMedia (AMFM Broadcasting Licenses, LLC) |
| Sister stations | KIOI, KISQ, KKSF, KMEL, KNEW, KYLD |
| Webcast | Listen Live |
| Website | 80sradio.iheart.com |
KOSF (103.7 MHz) is an FM radio station in San Francisco, California. The station is owned and operated by iHeartMedia. The station's studios are located in the SoMa district of San Francisco, while the transmitter is based atop San Bruno Mountains near Daly City, California. KOSF airs a 1980s-based classic hits radio format.
The former ABC Radio-owned station started on November 3, 1947 as KGO-FM. In earlier days, it simulcast its sister station, 810 KGO, occasionally airing a stereo version of the Lawrence Welk show. By the late 1960s, as FM stations were required to offer separate programming from that of their AM counterparts, KGO-FM, like other ABC-owned FM stations, was an outlet for ABC Love, an automated progressive rock format.
KGO-FM became KSFX in early 1971, and continued in a progressive rock format until May 1973. Then, KSFX ran a top 40 "Musicradio" approach, similar to WABC in New York City. By late 1974, the station veered towards a Dance/Soul-flavored format. During the late 1970s, KSFX had a brief run with a disco format.
In late 1980, KSFX veered towards an album-oriented rock format modeled after sister station KLOS in Los Angeles. This lasted until May 1982, when stiff competition from KMEL (now an urban-formatted station) and CBS-owned KRQR forced KSFX to drop AOR for talk, featuring the ABC-syndicated 'Talkradio' network, again as KGO-FM; this complemented the primarily-local talk programming of its AM sister station.
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