A tom will goblle on roost to let others now of his presence. If you are within say 100 yards of a roosted bird, your in luck. Try a few soft tree yelps to get his attention, and be ready. If you here him fly down be patient and call softly every 20 minutes or so. He may gobble back at you and come in or sit tight and wait for you (The Hen) to come to him. This is a great challenge of turkey hunting; when to call and when to shut up - when to move and when to sit tight - BE PATIENT, EVERY WILY TOM IS DIFFERENT. With the more time you spend in the woods the more knowledge you will get.