Not sure how I hadn't seen
http://www.hdtvprimer.com/antennas/siting.html before, but it helps me understand the situations. I do still have a trade-off, though. I'm in Wisconsin, so my shingles hold quite a bit of snow for 4 months out of the year. Sounds like that's a killer.
But UHF doesn't defract/recover from obstacles as well, so my neighbors house is also a problem. Well, we'll see.
Thanks for reading this far. Still appreciate any input.