Your plots indicate that you are most likely just below the crest of a hill (on its back side) to your NNE.
Do you have a view over the top of that hill or will you be limited to having your antenna below that crest (or any trees or man-made structures) that might be on it?
Generally, the Tri-Cities area requires an all-band antenna unless one can catch WYCB's channel 28 translator (which makes low-VHF reception unnecessary)
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