Until I looked at Larry's list I didn't realize that K03IC was on Mt. Tamalpias. I think this explains the strange SNR behavior I'm getting on KCSO also on RF 3. Even though KCSO is 30 dB above the noise I'm only getting an SNR of 20 dB when pointed at it. K03IC's heading is 13 degrees south of KCSO. When I point 30 degrees north of KCSO the SNR goes up to 22 dB (40 degrees off of K03IC). When I point 30 degrees south of KCSO the SNR drops to 17 dB (20 degrees off of K03IC).
I can't see K03IC on the analyzer with KCSO being so much stronger but I can see KTVJ on RF 4 also on Mt. Tam. I'm going to wait for favorable conditions to KCSO and unfavorable conditions to Mt. Tam and see if the KCSO SNR increases. That should confirm that the low SNR on KCSO is from interference and not multipath.