Greetings N8rbug,
My biggest concern is the trees you describe. Your Tvfool plot shows there is a nice amount of signal available to you.
The trees though, cause problems. Especially ones if in the way like oaks that are seasonal. Think leaves = chances for signals to be deflected and scattered. This can result in strong signals being unreliable.
With reception situations, each one is different so every situation requires specific review of what your needs are. At magnetic 31, you have a mix of UHF (real channels 14 -51) and high-VHF (real channels 7-13). This calls for an antenna that supports high-band VHF and UHF.
I would utilize that 15' pole and mount an
Antennacraft HBU22.
http://www.solidsignal.com/pview.asp...sku=1607900201. I would orientate the antenna to a heading of magnetic 31. You should reliably see ABC, NBC, CBS, FOX and MyNetwork. ION and PBS will be off the back of the antenna and may or may not show up.
RG-6 is a good choice. I bought my last 100' drop from solid signal. They do custom lengths.
http://www.solidsignal.com/pview.asp...nal-connectors
Four TV's may put you into a situation where a distribution amplifier may be needed. The Channel Master 3414 might be an option.
http://www.amazon.com/Channel-Master.../dp/B001PI09SE
Your best bet though is to get above the trees. As long as you are shooting through them, even the highest gain antenna may struggle with the disruption of steady signal.
When you do the antenna test, take the single lead coming off the antenna and put it into one TV only. This will be your baseline test for antenna performance. If you see all the channels you want reliably, then you can start adding distribution amp and leads to other tvs testing each one as you add them.
Best of luck!