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What are you using for your UHF and VHF antennas respectively?
Strong FM signals will still be picked up by almost any antenna. The 91XG, for example, with its 8' boom, picks up a LOT of FM from the side via non-intuitive means.
Suppression of extraneous signals must be done PRIOR to amplification, otherwise, they can either mix with other signals (creates unwanted products) or drive the amp into compression which reduces the amp's sensitivity to weak signals.
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