Coil recommendations for Patriot/F70

The ground balance didn't have any effect on the depth readings, but they do seem to be site specific. At one site, it reads deeper than the target actually is. At another, the depth reading seems spot on. I'm still trying to figure that one out. The site I am getting the deeper readings has an underground dog fence that was near to where I was hunting. Other than that, all I can think of is EMI, mineralization, etc. As long as the finds are showing up, I'm OK with it. It only seems to happen with the copper pennies, I got a few clad quarters at 4-5 inches that read just fine.
 

My F75LTD always shows the target as 2 to 3 inches deeper. I just mentally compensate and dig the plug a little shallower than the depth the detector IDs.
 

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