Topband: reliable contact among mast sections

[Donald Chester]

If you have hot-dip galvanised sections, there is no need to electrically 
bond the sections, according to the Rohn tower company.  I have used a Rohn 
25G tower as a vertical for nearly 20 years without a problem, and I have 
seen numerous broadcast towers using 25G and 45G, and have never seen any 
external electrical bonding.  This should hold true for any galvanised mast. 
  If you are doubtful, I would suggest running several strands of heavy 
gauge galvanised wire in parallel with the mast for its entire length.  If 
the mast is zinc-coated, avoid copper wire at all costs, since zinc and 
copper will corrode and turn into a crude battery cell/diode rectifier upon 
contact with water.

Don K4KYV

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