[TowerTalk] hdx won't cut it

[Jim Jarvis]

The riveted series of Rohn towers have a 10' limit on 
boom length.  The reason is torque damage to the rivets.

I'd suggest 45g or 55g, either of which will self-support
at 20' with a reasonable foundation.  One thing I doubt you'll find
is a fully engineered structure of only 25' height in the general
marketplace.  Not much call for them.  

n2ea
jimjarvis at ieee.org 
jimjarvis at verizon.net