Its like other techniques for whitetails.....
They don't work all the time but when they do, Man Look Out!!!!
You need an open area to use one,
place it quartering to you up wind at a comfortable shooting distance as the buck will always approach to the downwind side if possible as well as head on ( if you have it set up as a buck, they approach from the rear if you have it set up as a doe) which will put it in your lap looking towards the decoy.
Make sure its scent free ( if they smell anything out of the ordinary they are gone ) and then I spray buck urine on the ground around the back end.
Tying white small plastic bag stripes around the ears gives the decoy a little movement which when given a large distance to observe while coming in the buck will get cautious if there is zero movement.
If not spooked and their fully engaged you'll have plenty of opportunities to shoot as they just cant figure it out.
They work on field edges well but like turkeys if given to much room to observe they can hang up.
I think that about a half an acre opening is ideal! big enough to not startle them but small enough to get them engaged quickly.
Those are most the basics but im sure iv missed something.
Have Fun, it wont work if you don't use it!!!!!
Ben