This is what I normally do during spring gobbler season.

I use my owl hoot to locate the gobbler(s). This can be done in the dark, first light, and throughout the morning. I usually get a response w/ the owl hoot. They tend to shut up to an owl hoot as the day progresses. Where I hunt, they shut up all together around 10 or 11 with an occasional gobble throughout the day. They are the hottest in the morning though. You will find that they will gobble to just about anything. Owl hoots, crows, trains, gunshots, woodpeckers, car doors slamming, etc.

I close in on the gobbler's location once I locate him. If it is still dark and I am fairly close, I will tree yelp. This is just a few very soft yelps w/ some soft clucks thrown in. This lets him know that a "hen" is roosting close by. You don't want to do this too much though. On a good day he will try to find you when he flies down. Thats a really good day. Usually you have to coax him in. If he is "henned up" then it takes some coaxing on your part. It can work but not always.

You don't want to overcall. I call just enough to keep him interested. Sometimes I let him gobble a couple times and then let him know I am still in the vicinity. I rustle leaves when he is close. Sometimes they gobble just to that. Purring is also good b/c that makes him HOT.

If you get him in range of those decoys you should be set. However, I can't tell you how many times I was "set" and walked out of the woods birdless.

Another thing. Some people put them to sleep the night before so they know where the gobbler will be in the morning.

These have been my experiences and I hope I have helped.