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Calnet a multi repeater amateur radio system serving most of California and parts of Nevada. The Calnet system consists of numerous fulltime linked 440 MHz repeaters connecting San Diego to San Francisco and Lake Tahoe.

Amateur radio direction finding, transmitter hunting web site from San Francisco. Triangulating a radio signal direction and plotting its bearing on a map. Hunters use doppler systems for tracking hidden transmitters anywhere in the san francisco bay area, fremont california

SFHRC - San Francisco Ham Radio Club, formed December 1,1998, to conduct activities to advance the general interest and welfare of Ham Radio in San Francisco and neighboring communities of the Bay Area.

The loma pioneer repeater club - lprc provides 2 meter vhf and 440 uhf amateur radio and emergency communication for the san francisco and monterey bay areas from a repeater on mt loma prieta. aprs digipeater available.

Amateur radio direction finding, transmitter hunting. triangulating a radio signal direction and plotting its bearing on a map. hunters use doppler systems for tracking hidden transmitters

Live scanner feeds for the Fire department for various sectors of the San Francisco Bay area.

The S.F.A.R.C. is one of the oldest organizations of it's kind in the country This ARRL affiliated club was founded in 1916 and incorporated in 1919.

The Contra Costa Repeater Association operates the WA6HAM VHF amateur repeater serving the San Francisco and Sacramento California areas. It was established in 1977.

Located in the northern San Francisco bay area

North Bay Amateur Radio Association (NBARA), operates in Vallejo, California, at the northern tip of San Francisco Bay.

Conventional scanner frequencies for the San Francisco Bay Area, now in a fully searchable database

AM radio listening excels at night due to sky-wave propagation, where signals travel farther by reflecting off the ionosphere’s F1 and F2 regions. Daytime ground wave propagation falters as solar radiation ionizes the D region, absorbing signals. At night, reduced ionization allows recombination, letting waves reach hundreds of miles. This enables tuning into distant stations, like KGO in San Francisco from Northern California. Enhanced by tools like the CCRadio-2E, sky-wave propagation turns AM listening into an exciting nocturnal adventure.