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After seeing the chart, I'm now thinking the 7777 preamp may be overloading. Can you run the cable directly to one TV with both parts of the preamp removed? The 7777 preamp is designed for fringe areas & does not like strong signals.
Also, have you tried tweaking the aim? Sometimes pointing directly into trees or anything in the way is not always the best. I need a rotator for a few stations even though they are all in the same direction because of the trees & houses right in front of the antenna.
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