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I have an RCA preamp that makes up for cable losses in my longest run. That’s where I get my best overall reception. My strongest signal is ch 35, -52dbm as measured at the antenna terminals. My weakest is ch 44 at -85 dbm. The next measurable signal up in frequency is about -80 dbm near 728 Mhz. By the shape of the waveform I’m guessing it is a cellular transmitter. On the lower end of the UHF band are some commercial repeaters in and around 460 Mhz. The strongest there is about -72 dbm. I have no problem with VHF Hi as there is only one station on ch 9 with a strength of -58 dbm. It, along with most of my UHF come LOS from the CN Tower 30 miles to the NE. Intermod does not seem to be a factor. The waveforms even around ch 35 are very clean. I’ve seen what intermod does when I tried to put too much amplification in the system. Also I don’t know what the bandwidth is of a typical TV tuner. I have no idea what the rejection would be for out of band signals. I know at my location multipath is a significant factor. Aiming antennas is a challenge. A degree or two can make or break reception of a specific channel. My only thought is that the cable length problem is producing out of phase reception similar to multipath when a signal hits the TV antenna input. Again, any thoughts on the matter would be appreciated.
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