RE: How close ?
Just before the season opened here in NH I went of one evening to roost a gobbler. I went it the woods and sat just on the other side of a stone wall looking out into a clover field. I saw a turkey about a hundred yards away and I let out some yelps just to see what it was.
Well, he gobbled and then began running up the field edge right to me. I knew I had @&%#!* up so I just hunkered down and watched him through the stones in the wall as he strutted just on the other side. He was only the thickness of the stone wall away,about 3 feet. It was awesome how he pin pointed my position with only a few yelps. I took him a few days later from the same that spot.