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Greetings Jalberth,
Reception of WJET ABC is indeed an extremely favorable result. I would not have expected reception of it based on the provided map. What model UHF antenna are you using?
WJET is the strongest Erie broadcast on your map. The others are down in the negative double digits. This doesn't bode well for reception. Generally, once you start getting to about +8-6 db in signal strength, you arrive at the bleeding edge of reception. This is the place where signal strength falls below decodable levels. Signals that flirt with this line come and go even in optimal conditions.
Trees are a signal killer as you have noticed. They reflect and slice it up before it can reach your antenna. The better winter reception due the less foliage. Many people with trees in their signal paths don't like our advice here, but it is important, for the best chance at reception you either:
A. Get above the trees
or
B. Cut the trees down
Building an antenna system even sparing no expense, you will be handicapping it greatly attempting to make it overcome foliage.
Before we get too much deeper, you say you have the chance to raise the antenna another 15'. Please repost TV fool maps for 37', 50' and 100'.
You may not be able to get all of Erie to decodable levels, Johnstown and Altoona broadcasts though may respond well to the additional elevation.
Cheers.
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