I went back to the site where I had so much interference (my friends former home). I set the AT Pro to zero in pro mode, reduced the sensitivity about 2/3rds and set out swinging. About twelve feet into my trek the mid tone read 55 at about 4 inches. I thought it was some trash as before, but just for grins I dug it and EUREKA!! The illusive ring was found. My friend is going to freak out. Thanks so much to all of you for your advice. There is nothing like experience in this game.