The big question is, Why are you getting a new coil? Is there something wrong with your present coils?
Most of these aftermarket coils are jest expensive eye candy on your detector. A bigger coil just gives you a larger scanned area on each swing. A smaller coil just gives you a bit more separation on targets, like if you hunt garbage dumps. The thing is the power output of your detector is the same!
I have used the same stock coils that came with my detectors for years. My current ones are 16 years old. They will go down as deep as the new stock Detector & stock coils will go. Hay, my 2 Box is probably 20 years old and it will go down over 6'. The coil on the transmitter & receiver are the aluminum trim on the cases. It's the guts in the box that makes the difference, not the coil. Just something to think about from an old hunter! Frank
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