A hen or gobbler decoy can be a tremendous attractant to a mating spring gobbler. More importantly, the decoy allows you to anticipate the location of a shot, can help you judge distance by marking a reference point, and helps distract the approaching tom from your exact location. I once watched a new hunter squirm and change position several times as a gobbler approached, yet the tom was so locked on the decoy, that the hunter’s motion went unnoticed.
This video from Mossy Oak will help you with the key elements of how to use them effectively.
Photo (top) and video: Mossy Oak