Also, if you are set up too close to a roosted bird, he will be able to tell that your calls are not coming from the decoys. This may also cause him to pitch down in the other direction. Decoy shy birds are tricky. If you hunt a bird one day and he responds negatively to decoys, forget a decoy setup at first light the next morning on the same bird. Go in without a decoy, or hunt a different bird.
Decoys seem to work best when they can be used with the terrain.
If you can set up with a gobbler just out of sight and call him to a spot where he will be able to eventually spot your decoys, you will have frequent success. For instance, use small hills, terraces, or points of woods as objects to hide your decoys until the bird moves to a certain spot. Many times, when a bird can see your decoys from his roost or his strutting zone, he will want the decoys to come to him. Try your best to avoid this situation. Since you want to remain mobile when you are turkey hunting, you should buy decoys that will roll up and stuff into the game bag portion of your turkey vest.