I ordered a 6" coil to be delivered with my Safari but I am still waiting! Seems they come from Bulgaria and the manufacturer will only ship 40 or so at a time and there is a back order from KellyCo. Promised to get it next Monday after seven weeks! Anyway be that as it may, it is a concentric coil and should be tremendous around fences and playground equipment, as well as heavy junque sites. Anyone have experience using one with a Safari or Quattro? Would like some words of wisdom! Onus