Here in Vt they go to the roost a little bit after the sun sets while it is still light. Once they settle in they often gobble a few times to let all the ladies in the area where they are. So if I am in a known roosting area and don't see birds I just sit and wait until dark to locate them when they let off the good night gobble. When it is dead dark and I am trying to locate birds I use an owl hooter with decent success. It doesn't always work but if I know there are some toms in the area I willsometimes try the owl call in morning while it is still dark. Caution though they often won't shut up when you do that in the morning and will gobble all sorts of hunters into the woods.I set up about 100 to 200 yards away from a roosted bird trying to put my set up in the general direction they usually travel.