In this situation, you can do what's called a tree yelp, which is an extremely soft version of a yelp that hens do just before flying down. It tells the tom you're there and may give you that edge of having him come right to you off the roost.

Your best bet, like somebody already said, is to catch them the night before going to roost, set up close, and then do the tree yelp. This, I believe, is dynamite.
-MIKE