Like everyone says, a hen and Jake is a good combo. The last few years I have been using 2 feeding hens with or without a Jake. Always put the hens close to you and the jake a little further out (where you want to take your shot) because the old tom will always go for the Jake first.
I started using 2 feeding hen decoys because I started to notice that toms will sometimes hang up out of range when they see a hen with head erect, as in an alerted position, and not moving. On the other hand, they seem to come right in if the hens are in a comfortable feeding mode, even when the Jake decoy is erect.
WoodsyDave