You know there the roost tree is.
You know there are some "shooters" in the group.
You know they generally head in the "other" direction.
You have them "patterned" - so set up about 100 yards away from the roost tree along the direction they normally head.
I make some soft purrs while they are on the roost; to say, "I'm awake are you awake".
After fly down I let them hunt me................
If they look like they are veering-off, I will putt & purr softly to see if I can get those Toms interested in leaving the lead hen to check me out.