Originally Posted by Calaveras
The TV Fool report shows line-of-sight to all of the SF stations so there's no obvious reason why they're having trouble with just KQED on UHF. No reception of KGO on RF 7 and KNTV on RF 12 is likely due to an inadequate antenna on VHF. They probably need this for VHF:
Are there any other problems with UHF stations from Sutro tower? How about KOFY, KMTP, KFSF, KCNS, KCSM and KBCW? If it's only KQED it may be just an unlucky location for the antenna and relocating it would help. Any issues with Mt. San Bruno? KKPX, KTSF, and low power stations KFTL and KMMC?
The TV Fool report shows strong signals so adding a preamp would probably be a bad idea as it might overload the TV and cause more problems.
Ok so regarding other channels transmitted from Sutro Tower they can and can't receive.
Can receive ok: KOFY (20-1, 20-2, 20-3, 20-4), some of KMTP (32-1, 32-5, 32-6), KFSF (66-1, 66-2, 66-3, 66-4), KCNS (38-1, 38-2, 38-3, 38-4, 38-5, 38-6), KCSM (60-1, 60-2, 60-3)
Cannot receive: some of KMTP (32-2, 32-4), KBCW (44-1)
Regarding channel transmitted from Mt San Bruno:
Can receive ok: KKPX (65-1, 65-2, 65-3, 65-4, 65-5, 65-6), KTSF (26-1, 26-2, 26-3, 26-4, 26-5, 26-6),
Cannot receive: KFTL (28-x), KMMC (40-1)
Not sure what to conclude from all this. So they can get many stations from Sutro Tower (including KTVU on RF 44, KRON on RF 38). But they cannot get a few of the major stations like KGO (7-x on RF 7) and KQED (9-x on RF 30). I think not getting KGO from Sutro Tower may make sense because apparently they are using relatively less power to broadcast (23.8 kW according to http://www.choisser.com/sfonair.html
) compared to other stations. And maybe some of the KMTP channels too since they broadcast using 480 kW. But this doesn't make sense for KQED and KBCW which broadcast with 1000 kW.