KNAC went off the air a while ago. They've been on the net for a while though, and I used to listen to KNAC on the internet all the time @ work, but then the quality of the sound (bitrate) was decreased and I stopped listening.
I live in the Bay Area, and one of the only stations here that played metal and was involved in the promotion of metal tours, etc, KSJO, one day just came up as a Mexican station. Couldn't believe it. Hit the preset on the radio expecting to hear some hard stuff, and get some mariachi band

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