Went out with the 4x6 for the first time today and enjoyed it. I assumed that I would have to pinpoint from 2 different sides to narrow down the location of my target, but that really didn't seem to be the case. It seemed as if the highest tone was always smack dab under the very center of the coil as if it was concentric. Was this just luck? I was under the impression that the DD coils always read the same the entire length of the coil.