Laurie, I would watch the video first and ask more question on the coil choice in your area. What may work fine in one location may not be good in another location. Just for your info there was a few versions of that coil. If memory serves me right one was for the SD series detectors , one was for the GP series detectors and the other for the GPX series detectors. There is a lot of info on the Coiltek webb site. Have a good read on there site Laurie. Jack Lange used the coiltek ufo coil 12 x 24 in his videos and he said that it was a good coil for the GP extreme. Good luck roscoe