I have a old house on my farm, in the up stairs loft in the very corner where the roof line meets the corner of the wall I have gotten a signal with my detector that sounds like a coin sound.. the problem is, there are 3 2x4 poplar wall studs nailed together there which is the main support studs for the corner of the house, my 8" coil is too big to pinpoint the target, the tin roof is only inches away also..is there a pinpointer made with a disc. in it or do any of you have any ideas? I tried a crow bar to pull the boards apart as much as I could but never found anything and the target is still there.. thanks!!