A submissive Hen with a Jake decoy will most likely get the Tom or a couple of Jakes to leave the group to investigate and try to scare the Jake decoy away.
Call as if you are a hen in need of help to get rid of the pestering Jake decoy, with some soft pleading call.Some of those Toms can't refuse a fight with a smaller bird.
Although sometimes it can backfire, some birds weary of fighting will shy away from a fight, go away to enjoy the company of hens they've already got, and I can't blame them.