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Don't put too much faith in the calculations resulting from changes in elevation. Vertical resolution of the terrain data exceeds 10' and there is considerable "averaging" of terrain elevation within the horizontal resolution of the data.
If the signal must cross the roof to get to the antenna, plan on 10' above the metal roof for UHF signals. If the antenna is on the same side of the roof as the signals, 3-4' is adequate for UHF.
Align the panels so they are parallel to the crossbar and aimed in the same direction for maximum UHF reception.
Your VHF station is probably strong enough that a separate VHF antenna likely will not be needed. If it does, the option above should work.
You'd be best if you kept FM out of the TV signal distribution since you have several moderately strong FM stations nearby. Our 3-element FM antenna works quite well and would likely be the best suggestion I can offer unless you have very specific FM reception requirements.
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