A few years ago I was able to pick up a couple of very weak 2 edge UHF signals that had a negative NM of 7 and 12 or so respectively. And I received them reliably. Used a Antennacraft HBU 55 antenna and Winegard 8275 pre amp.
Not sure that you can get such weak VHF signals but it may be possible to use a Deep Fringe antenna like the one mentioned or something like the Antennas Direct 91XG or possibly a good 8 bay like the DB8e from AD or Channel Master 4228 and get some of those UHF signals with a NM above minus 10.
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