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I'd agree with other posters that your problem is interference. Yet I doubt FM overload as there is no FM station that will have a second harmonic on channel 12. I also doubt electrical interference as WRGB on channel 6 would be the first one to be bothered. I'd suspect a computer, amplified FM antenna, battery charger or some other unrelated device. Moving the antenna to the roof is likely to fix it due to stronger TV signals plus weaker interference. The other option is to turn off all circuit breakers in your house except for the one to the TV set. Then unplug everything but the TV set and preamp and see if WNYT comes in. If it works, turn things on one at a time until you discover the culprit.
Another possibility is a bad preamp. You may not even need the preamp in Red Hook unless you are splitting to many TV sets.
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