I've never just focused gobblers in the fall, but a trumpet or long box would be the first call I'd grab to go after one.. ok who am I kidding... a long box is what I'd use. Gobbler yelps, fighting purrs, and gobbling has been successful. Have to know what you are calling to if you want to bring them in.
Many more experts in this field on here. Hopefully they'll respond on their tactics. I wish we could use dogs here in MO:(