[TowerTalk] dissimilar metal in ground

[HansLG at aol.com]

Gentlemen,
 
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