After switching coils from my AT GOLD to my AT PRO( see problem post below) the PRO was hot. We hit a foundations in the woods that was LOADED with iron around it. My 2 buddies could not hunt near it, but I went REAL SLOW and picked in between the iron and came home with a Copper, 1910 V nickle, 2 dress weights, a couple what-zits and even dug a DAVIS Baking Powder bottle. The weather was GREAT for detecting. One thing if we go back next weekend I'm going to try the small coil from the GOLD 5 X 8 I believe.