I just finished watching an outstanding video on a different forum. The guy was using a Goldbug with the 11 inch dd coil and was hunting a civil war camp. Most videos I watch just show the target laying on top of the plug, but what was neat about this video was how much iron was in this camp. There was a literal carpet of old square nails and this guy let the watchers hear and see the evidence. I was particularly amazed at how the Goldbug picked through the heavy iron. That good tone stuck out like a sore thumb amongst the iron with that detector. It appears to be an amazing detector.