[TCML] Using tree as RF ground

[Dave Leddon <dave@xxxxxxxxxx>]

Hi all,
I have recently moved to a new house which, as near as I can tell, 
sits on top of a granite hill.  I've tried pounding in an eight-foot 
ground rod at various locations only to hit impenetrable soil at a 
depth of about one to two feet.  The property has numerous large pine 
trees with diameters ranging up to 4 feet and it occurred to me that 
such a tree might make a great RF ground by driving a spike into the 
trunk near the base.  Does anybody have experience using trees for 
grounding Tesla Coils and is there any likelihood that the current 
could damage the tree?
Dave

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