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I think that CBFT and CBMT will be harder than you realize. They are on channels 19 and 21. WCAX is on channel 20 and 70 dB stronger. That suggests that you need an antenna with an extreme side lobe rejection. The 91 XG and DB-8e are both in the 20 dB range by themselves, and that’s not enough. A potential solution is a pair of either of those antennas, one stacked 5.8” to the left of the mast and the other above it stacked 5.8” to the right. Add them together with a two way splitter with identical lengths of RG-6.
If the antenna works as exactly predicted The reception will probably be marginal. If it works better than predicted, the reception will be fine.
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