I used to use a standing hen decoy that seemed to scare away the toms. Maybe because the decoy had it's head straight up like it was alerted to something. I switched to a feeding hen decoy and found it to work out better for me.
If it gobbles,runs on gas, or is married to you it will give you trouble!
I no longer use decoys but when I did I would place a single hen about 20 yards behind my setup so that it would catch the gobs attn, I usually put it to my right or left depending on the woods but this seemed to get there attn instead of any movement I might have had.
I use decoys quite a bit, if I'm hunting open fields. If I'm in the woods I tend to not use any at all. Early season I use a jake and a single hen, mid season I'll use a strutter and two hens, end of the season I use just a feeding hen. One thing I've found is that if you use a strutter keep him away from your hen decoys by about 10 - 15 yards. Birds seem to shy away from your dekes if the stutter is in close with your hens. I put my strutter at about 15 yards from me and my hens out about 25 yards. If I'm runnin and gunnin then I'll carry a roll up hen in my vest just in case I find a good set up spot?
I have gotten birds both ways. Usually put the decoy at about 20 yards. I have a couple hens and a jake, but usually use my orginal roll up foam one that is all beat up. When I set up I try to set up so when I can see the bird he is in range to shoot.
What works for me may not work for you and what works today may not work tomorrow Doug <- <- ~<- <- <- ~ <-