I recently bought my old F5 from the fellow I sold it to a couple of years back. It came with the stock coil which is just OK in my bad ground. Thanks to a forum member, I just got the 11 inch dd coil. This coil works great and today's short hunt verified just how good this combo is. I use three tones and good headphones(gray ghost platinums). The audio is unlike any other detector I have used. Crisp, clean, modulated tones. I don't even need the pinpoint button because of how quick and clean the tones are. This detector makes metal detecting fun and unlike some other detectors I have used, having success and fun is what it is all about.