Go over to
www.rabbitears.info and see what channels you'd actually get from each one of those towers. See where duplicates exist. You got stuff coming in from multiple angles, so see if you can eliminate any direction that you don't need to care about.
Rabbitears is also a little more up to date as far as what towers are still in service so might be a little less then what TVFool reports.
I'd start out with a 91GX and start pointing it where stuff is coming in from. Feed the antenna into a preamp and run RG6 coax. A second antenna might be a likely possibility.
If the signal strength isn't good enough on the 91GX to keep constant video playback on the channels you are wanting, might have to really invest in a big antenna. Or you can start out with a huge expensive antenna. A good antenna with surface area will be your friend at 80 miles on 2Edge. Though not sure what is next up from the 91GX.