Welcome, Richard:
Yeah, those hills are a problem. If you are willing to experiment with a temporary test setup, I suggest a Winegard HD7698P aimed at 255 degrees magnetic, and an Antennas Direct Juice preamp.
https://forum.tvfool.com/showpost.ph...93&postcount=3
This is what the KNTV terrain profile looks like. Notice that the ERP is only 28 kW out of 103 in your direction:
And this is for KQED:
The signals from VHF real channels 7 and 12 have a better chance of diffracting over the peaks of the hills than the UHF channels. It might help if you tilted the front of the antenna up a little. The 7698 doesn't have a tilt adjustment, like the UHF only 91XG, so it would be a custom modification.
I tried different heights using an estimate of your location. It helped a little, but not a lot. Your 2Edge signals aren't likely to be 100% reliable, but I think your chances are good if you don't have trees or buildings in the path between your antenna and the hill peaks.
25 ft
http://www.tvfool.com/?option=com_wr...f1f01671c787ce
50 ft
http://www.tvfool.com/?option=com_wr...f1f0478fef5d1f
100 ft
http://www.tvfool.com/?option=com_wr...f1f0a8cfc42863
It might be possible to get a little more gain from two separate antennas, one for UHF like the 91XG or DB8e, and an Antenna Craft Y10-7-13 for VHF. But try the 7698 first.
You don't seem to have any strong FM signals that might interfere with 7 an 12; the Juice doesn't have an FM trap. The Channel Master 7777 or 7778 do. See attachment 3.
The coax should be grounded with a grounding block that is connected to the house electrical system ground with 10 gauge copper wire for electrical safety. For further compliance with the electrical code (NEC), the mast should also be grounded in a similar manner to drain any buildup of static charge, but the system will not survive a direct strike.