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Thanks for the analysis. If ABC is a long shot without 75 foot tower, how high of a tower for the other stations?
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You
might be able to get away with 25 ft. if Fox with a Noise Margin (NM) of -3.8 dB is your weakest desired signal.
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Is the AD91XG directional enough to ignore WMAU?
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The 91XG is an excellent choice for UHF, but it is not suitable for CBS on VHF-high real channel 12. If you used the 91XG, you would need to add a VHF-high antenna combined with the 91XG using a UVSJ (UHF-VHF Splitter Joiner).
The 91XG is very directional, and WMAU-DT is in the opposite direction, but I don't think that the F/B (Front to Back) ratio of the 91XG is enough to ignore WMAU-DT. You would still need the custom single channel bandstop filter for channel 18 from Tin Lee. The filter would be inserted between the antenna and the input of the preamp. The filter doesn't need to have enough attenuation to completely eliminate CH 18, just enough to weaken it so that the preamp isn't overloaded; the AD Juice preamp is stated to be highly resistant to overload. Without the filter, WMAU-DT is 81.2 dB stronger than Fox.
Antennas Direct 91XG Antenna Technical Data Sheet
JUICE Amplifier System
Since your reception problem is very difficult,
it would be a good idea for forum member ADTech to double check my analysis. He works for Antennas Direct and often comes here to give excellent advice. If he doesn't show up to post his advice for your problem, I suggest that you send a PM to him to get his attention.