Answer
Jun 14, 2021 - 02:56 PM
The two main coils are the (DD) and the concentric or also named (mono loop) coil. The concentric coil puts out a snow cone-shaped field (shaped like a snow cone), the DD field is more like the "knife blade" of the concentric (shaped like an I). The DD coil separates much better and gets more even depth especially in mineralized ground.