just recieved my 15 x 18 sef butterfly coil. arrg. the coil will not pick up a guarter at 4 inches. kellyco ad says it will find a single coin at 20 to 26 inches. by the way im using a dfx. called kellyco they said this coil is not sensitive enough to find coin sized objects.not what there ad says.they said i couldnt send it back because i already used it. boy that makes a lot of sense. so im trying to find a way to make this coil work even if i use it just for relics. need info on what signals to look for and settings . has anybody had anyluck finding coins with this coil. i am using the dfx maxed out sens 85 dc 60 preamp 4. it runs pretty stable at these settings. how can i set up the dfx to be more sensitive to coins. please help me . thanks.