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Preamps are always needed when all the stations are weak. They should never be used when all the stations are strong. When one or more stations are extremely strong and others are weak you must select the preamp carefully. The Winegard antenna that you've mentioned has a built in preamp that can't be bypassed if it causes problems. That preamp has no published data to determine if it is appropriate for your location. Your problem is that WHKY is extremely strong and is likely to overload anything but the best preamp.
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