I agree, mounting height is the single most important factor.
If the CM3023 is returnable, the Antennas Direct 91XG would be my choice for receiving WMEB and WFVX.
Re. preamps, their prime function is to overcome losses in the cable and splitters that are connected to the output. No amplifier can 'pull' more signal out of the air or improve the performance of the antenna.
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