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Yeah, It never hurts to try another tuner to see if there are any differences.
I recently put up a 91XG at a friends house & with a few hours of slight height/tilt adjustments, reception is outstanding. We had previously tried the original CM 4428 & Winegard HD8800 with so-so results. We also switched from a CM7777 preamp to a Winegard AP 4800 (UHF only) & noticed a slight improvement in reliability as well.
One other question; how close is the preamp module to the antenna?
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