I originally had the black stock 10 1/2 inch coil on my Explorer ll.Following a suggestion from Bryce I switched to the 1050 coil which I haven't used in the field yet.The big K has a sale on the 6 inch DD coil so I just ordered one.I did use the 11 inch Pro Coil this fall but didn't get the depth I got with the stock 10.5 coil.The balance and weight on the Pro Coil was better and it did separate targets and pinpoint well,but with stock coil for me worked better.I even had a 10X5 Joey coil and didn't really like that coil either.My strategy with search coils since I'm on a budget the 1050 and 6inch Excellarator for this coming season.