i am looking at getting a new coil and i am not sure which type to get, so i am looking for some input. i pretty much hunt parks playgrounds, vacant lots in a city setting. so coinshooting is what i mostly do. the reason i am looking at coils is i rarely find targets below 5-6 inches, so i guess it is depth i am mostly looking for. i have a delta 4000 teknetics. it currently has a 8 inch concentric coil. pretty much my choices are....10 inch elliptical coil or 11 inch and 13 inch DD coils. i would appreciate some thoughts on what way to go. a new detector isn't in the budget for now...dangit!