Took my new F5 out to the city park today. This is about my fifth outing with it and up to now I've not really challenged it. Today I pulled a wheatie out from ten inches. It was a weak signal bouncing from zinc to dime. Now I can relax about it's ability to pull deep, older coins. Soil is sandy loam mixed with clay. Gain set at 80 and threshold at +5. Gives me a little noise but not when I'm sweeping. I think I made a good buy.