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Originally Posted by MetHerb
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I'm curious why you say "actually be able to watch WPRI". The TV Fool report list the db at 4.1 and regularly can get stations now the -4 range and as low as -14. My new setup should have an antenna with higher gain (actually, I don't even have a VHF antenna now) and shorter and better cabling for less signal loss. Do VHF signals work differently? My only distant VHF station that I'm hoping to pickup is WRGB from Albany which is listed at 1.5.
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You've got at least two TV Fool reports posted, so it's not clear which one is most representative of your situation.
Using the NM value of 4.1 dB for WPRI I get an estimated net NM of just under 10 dB at the TV, see attachment.
WRGB on real channel 6 is lower in level (using your NM value of 1.5 dB) and there will quite likely be more RF noise and interference to contend with at that frequency range. Finally, neither the 91XG or Y10713 are designed to receive real channels 2 through 6. Using a Winegard HD5030 to estimate the results I get an estimated net NM of -6.5 dB, see attached.
A net NM of less than 0 dB strongly suggests that you can't expect the tuner to lock on the signal. IMO, a net NM of 10 dB or greater is a reasonable goal when designing for 'reliable' reception.