LOS is always best but I get stations that are both 1 Edge and 2 Edge with little to no problems. Almost everyone will say higher is better. I'm actually suprised that no one else has given any advice yet. As for mounting on your roof I have no idea. I'm pretty sure that one of those antennas will work for you. Both the DB8E and the 91xg have high db gains. I believe the DB8E is around 17.6. Cause of the hill and the taller homes I would either use the DB8E or the 91xg faceing at about 292 degrees magnetic. These are UHF only antennas but sometimes can get VHF signals (not guarenteed). If you wasn to get the VHF channels you are going to need to either get a seperate VHF antenna and a combiner like the Clearstream C5 or the VHF dipole addition.
Rich
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