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[TowerTalk] dissimilar metal in ground

Subject: [TowerTalk] dissimilar metal in ground
Date: Fri, 16 Dec 2011 00:33:47 -0500 (EST)
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I have a tower with a galvanized base dug down in the ground. My house is  
equipped with a number of copper-clad grounding rods. The tower is connected 
 (via my shack) to the grounding rods. 
What should I do to avoid the galvanization to be eaten away due to current 
 caused by the dissimilar metals. As far as I understand zinc and copper 
will  make a battery cell due to the humidity in the ground.
Hans - N2JFS

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