Have been considering a DD search coil for the F5 to compliment the original concentric. Search area is low to medium mineralization - pretty trashy area. Would like to present this question to our F5 Forum that can share your hands on experience with this Coil and others that you have found useful. MOST all my detecting is for coins & jewelry. If this questions has already been answered previously you can just tell this senior where to go? Any and all input & suggestions would be very much appreciated. Thank you for sharing! CY USAF 62-66