Was out today in a Local Park was in the volley ball court nets not up yet, got a hit 72-74 faint, started to dig kept digging vdi 74 pulled out a 1985 penny at just little over 11". dic set at 40 sen 90 now i don't know about you but that's pretty deep for a penny. i was using the 5" coil. The court hasn't been used since last year.