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| Broadcast area | San Francisco Bay Area |
| Frequency | 810 kHz |
| Branding | 810 KSFO |
| Programming | |
| Format | Conservative talk |
| Affiliations | |
| Ownership | |
| Owner |
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| KNBR, KNBR-FM, KSAN, KTCT, KZAC | |
| History | |
First air date | January 8, 1924 |
Former call signs | KGO (1924–2024) |
Call sign meaning | San Francisco |
| Technical information[1] | |
Licensing authority | FCC |
| Facility ID | 34471 |
| Class | A |
| Power | 50,000 watts (unlimited) |
Transmitter coordinates | 37°31′35″N 122°6′2″W / 37.52639°N 122.10056°W |
| Repeater(s) | 560 KZAC (San Francisco) |
| Links | |
Public license information | |
| Webcast | Listen live |
| Website | www |
KSFO (810 AM) is a commercial radio station licensed to San Francisco, California, United States, featuring a conservative talk radio format. Owned by Cumulus Media, KSFO's studios are located are on Battery Street in the SoMa portion of San Francisco's Financial District.
KSFO's transmitter site is in Fremont, near the Dumbarton Bridge, where its prominent towers are landmarks used by pilots as a waypoint in communications with local airports. KSFO broadcasts with 50,000 watts, the highest power permitted for AM stations by the Federal Communications Commission (FCC). It uses a directional antenna fulltime with a three-tower array. Most of its signal is sent north and south to avoid interfering with the other Class A station on 810 kHz. Most nights, using a good radio, KSFO can be heard throughout the Western United States and Western Canada. Due to its extensive groundwave signal, its daytime coverage extends into many areas of Northern California.
- ^ "Facility Technical Data for KSFO". Licensing and Management System. Federal Communications Commission.