Since it is much more difficult to intercept a gobbler moving with a group of hens, you'll often have to call in a whole flock in order to get at the gobbler. The only way to find out what the leader of the pack wants is to experiment. Assuming the flock is feeding or loafing within earshot, listen to what the hens answer to most readily. Feed them a continuous line of what they want and they'll soon come to check you out, bringing the gobbler in tow. The ideal calling location is along the route a gobbler uses to get to his strutting area.
Decoys are optional when hunting travel routes.
Success often depends upon your ability to predict where a tom will travel and then to choose a location where the approaching bird can be blind-sided. This kind of scouting is very similar to the type you'd conduct when trying to setup to tag a whitetail on a feeding pattern. Often these routes will be as obvious as field lanes and old logging roads, but can be as subtle as an open ridge top or even a fence line. It may take a couple of days of hunting to figure this out. Follow along at a safe distance as the turkeys take you through their daily pattern a time or two, and you'll know exactly where to set up.