[Towertalk] Air Terminal Placement

[sparks@apk.net]

I intend to put an aluminum air terminal at the top of my 100 foot tower to 
help reduce localized charge accumulation and hopefully lower the possibility of 
a direct lightning strike. I have an omni at the top with a fiberglass radome 
that extends 11 feet above the tower.  Do I need to get the tip of the air 
terminal some distance above tip of the omni before it will do any good?  I 
guess my concern is that charge accumulation on the fiberglass omni might 
provide a conduction path, effectively making my air terminal useless if the tip 
of the terminal is below the tip of the omni.

Any thoughts on positioning air terminals?  Thanks - Jeff WB2RUZ