If the deer look like ants you might be too high.

Seriously, where I hunt youhave tobe 30'+ when the leaves are off the tree. There are too many deer and too many eye balls around. You won't get a shot at the big boy if your below 30'. You will only be ableto watch him walk through. If you hunt a place where they come through one or just a few at a time, that is a different story.