Remember that pre-amps only zero out cable losses, so doing the math for KRON: -6 NM + 10 dB antenna gain - 2 dB amp noise gives a noise margin to the receiver of 2, not enough to protect against all fades. You need to spend your money on UHF gain, not so much high-VHF. Consider going for the Antennas Direct 91XG (up to 16 dB) paired with an AntennaCraft Y5-7-13 (6 dB), combined by the CM-7777.
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