Another question. How do you read the signal part of the TV Fool report? Is the greater the number the better the signal?
But as you can see, there are many unknowns, like weather conditions, which way the wind is blowing through your trees, etc. etc. There are even different types of transmitters that might create wave forms more or less stable under different conditions (refraction, reflection, temperature flux ... who knows ... all hush hush ... very proprietary). You are catching everything right down to +19NM and then it stops cold. So that makes perfect sense. And you can see that either the trees are cutting out some signal, or the antenna is lower gain than we'd like. (Hard to find any solid gain figures on that type antenna. Maybe I'll hunt around the net tonight.)
There are people with no obstructions like your trees who get signals with negative NM on the report. Not below minus 10 or so. Not unless you're like the guy who built custom Yagis cut to size for each individual frequency, then combined them with a half dozen A/B switches. :clown: