I suppose it depends on the terrain, but I'm suprised to see someone sitting a decoy more than 50 yards away from the caller. However, the "caller" was identified as a person with hand calls or an electronic caller.
I use hand calls and usually set my motion decoy upwind and/or at a crosswind to my calling position...at about 25 to 30 yards. I don't want the coyotes to pin point my calling location, by the sound of the call and not associate it with the decoy.
Good hunting, Bowhunter57