With that in mind, I'm probably going to put a PAR OA-50
up a 20' pole and maybe get an amp for 6 meters - that should
work FB (I hope).

Ken....should work fine. Mine is up around 30' and does a fine job (on a
ridgeline, to boot). As for the amp, if you like homebrewing, there was a
decent design in QST some years ago...think the design is on the 6m.com site.
I built it, works great.

Cheers;
A