20' ? Egad's man. I'd be scared to death to stand up. Much less pull back my bow string. Seriously though, I do have friends that hunt that high or higher. I hunt at the most 15' off the ground. Most of the time only about 12'. I've found if you watch your scent and the wind you don't have to get that high. Just a personel preference I guess though.
Hunting, fishing, drawing, and music occupied my every moment. Cares I knew not, and cared naught about them. --John James Audubon