I sold my tornado for the 12 x 10 sef....tornado would not hit a wheatie in dry soil...12 x 10 nailed it solid from any direction. 10+ inch wheatie...Nel Tornado. Best overall coil. I have one for each of my detectors. Still waiting on NEl to make one for the EQ800
Each has their own special coil that out does all others....mine is the detech 12 x 10 sef.