at 20yds, 20' in a tree, I shoot 1" higher than off the ground. At 30yds, 20' up a tree, there is almost no difference. The only time i could ever see 6" of difference being possible is if you were 40' up and the deer was really close. But even then, most of your percieved raising of impact is actually just the steeper angle. Example. If I'm shooting at 10yds off the ground and pull the shot 1" high, it hits 1" high. If I'm 30' up a tree, shooting at a broadside deer at 10yds, and pull it the same ammount, I might actually enter the deers body 6" higher than I would have. But there's only a 1" difference in arrow flight.