2Eagles, I am by no means an expert, and plenty of guys on here have far more experience than I do. But, the short answer is no a hen does not need to be paired with a jake.
I have had birds come right into, and strutt for a single hen decoy...
However, seems like I have decoys ruin more opportunities than gain...
- Toms will hang up on a hen decoy waiting for her to come to him.
- Been busted while trying to set up a hen decoy.
- Had a large tom run for his life when he saw my crappy jake decoy last season.
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Seems to me, when I get a bird coming to me, and he does not see the decoy, he keeps coming to me, actively looking for that hen. Had a couple of toms hang up strutting about 70 yards last year, and would not come to greet that hen.
Whereas, both birds I killed last year, were visibly looking for that hen that was calling. I do believe I would have killed my third bird if it were not for mistakes made with a decoy.
I agree with
Bowguy. Hunting a setup off the roost, I might put out a decoy or two (probably a jake and hen). If I plan on being mobile, I would leave the decoys in the truck.
Now, if I were bowhunting, I would be more apt to use a decoy, and when I start taking the kids out, I will likely set up a blind with decoys... And, I suppose if I were hunting a large open area (which is not something I see in my area) I would probably be more apt to use decoys as well.