I'm inclined to agree with ADTech:
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The mountains do a terrific job of blocking the signals.
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The signal path doesn't look very promising to me:
I don't have your exact address, but from an estimated address that gives a TVFOOL report very close to your report, an FMFOOL report doesn't indicate a threat from FM signals (but there are other types of interference that affect TV reception):
TVFOOL report from estimated location:
http://www.tvfool.com/?option=com_wr...82306fb06476ac
I don't think you need an FM filter, but it's worth a test because they are inexpensive.
I agree with ADTech's preamp selection. However, the noise level on VHF-High at your location might be high which would reduce the SNR of channel 7.
I have one weak VHF-High channel that barely makes it to 15 dB SNR. Some days I get it, some days not, according to the noise level from electrical interference.
Did you ever get 7, or only once in a while poorly?
Have you done a successful tuner scan for 7 so that it is in the tuner memory, in case it shows up?
How is your reception of 11 and 13 from the same direction?
Are there any trees in the signal path from that direction?