I made a test garden and duplicated the same thing in it .I put a musket ball and 2 buttons at 5 inch and I put 5 nails at 4inchs over the top of them.It did the same thing as I experienced in the field the other day, It raised the volume of the low tone and moved the vdi to 6 when I went over the targets under the nails . A very interesting little tid bit that im gonna keep experimenting with.
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