On a Tejon, what kind of depth does the 5.75 concentric get compared to the stock coil in moderate to good ground? Almost as much (just 1-2" less) or does it only get about 7" or so? I know of a site that is practically carpeted with small iron and nails and the good targets are about 8" to 9" down, under tree roots. I tried my X-terra with its 6" DD coil, but it just wasn't getting quite deep enough. But if the Tejon small coil will be able tell me the difference between iron and non-iron at 8" I will get one and try it out. Anybody with experience on the small coil?