[TowerTalk] Anodized Aluminum Tower

[Pat Barthelow]

Folks:

I picked up some years ago, a US Coast Guard  anodized aluminum  vertical 
radiator that stood for decades next to the ocean.  It is incredibly 
versatile, mostly due to its exteme lightness.  It stood on a large Lapis 
conical base insulator, was about 90 ft, guyed,  with 10 ft bolt-together  
triangluar sections, of about 10" face width.   Each section has 2 ea bolt 
holes, about 9/16" dia  in each face or 6 per joint, when put together 
vertically.  The  sections have  a horizontal aluminum angle flange from 
corner to corner  that has bolt holes to join to the next section, flange to 
flange.  I'll try to take some pics tomorrow.

My question is, if I use conventional high strength  bolts and heavy washers 
to join sections, I may have dissimilar metals issues that will weaken the 
joint, eventually making the 'tower' no longer sound.  It does not and will 
not support any significant weight or large antenna, possibly just a small 
VHF or UHF Yagi,  or vertical whip.  It also will not be climbed, even 
though one side of the 3 sides has cross members that originally functioned 
as steps.
Any ideas on how to eliminate electrolysis betweent the aluminum and the 
steel bolts?

73, DX, de Pat AA6EG aa6eg at hotmail.com;
                  Skype:  Sparky599