Phil,

Any luck with that bird ? If you can get within
A hundred yards and call very aggressively
You might get the dominant hen mad enough to
Come kick your butt and bring the Tom along with her.

As a last desperate choice you could wait until they
Fly up in the evening and then go in just before
Dark and flush them. If you can get on him the next morning
Before fly down and set up close you might be able to
Call him in before the hens get to him---again last
Ditch effort.

Also, if you've been hunting him in a field, if he doesn't
Fly down in the field, I would leave the decoys home
And try him back in the woods near where he roosts.

Good luck.