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When I look at the specs for the HD7694, it only shows a UHF range of 25 miles. I'm assuming this is just a guideline? Channels 19, 38 & 44 are all over 30 miles away. When I read some of the reviews, people seem to be pulling in channels further away than what it's rated for.
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If not for the trees, I was thinking of an even smaller antenna... Your TVFR indicates LOS paths for each of the top six digital listings. The noise margins are all better than 30 dB above the theoretical minimum needed for reception. The gain of the 7694 adds to that margin.
Finally, 'mileage' values are the product of the marketing department, not the engineering department. Winegard is being conservative, not trying to hype the capability of their product. (This is one of the ways they've earned my respect.) (But when you see claims of 150 mile range, you're in the company of very dubious characters, willing to say anything to get your money.)