[TowerTalk] Balun on a vertical

[Bob Nielsen]

On Oct 6, 2006, at 3:32 PM, K3vw at aol.com wrote:

> Once again, one does not use a balun on a vertical antenna because  
> it is an
> un-balanced antenna !! You use a UN-UN or an RF Choke at the feed  
> point.
> Balun's  are for balanced-to-unbalanced, antennas & coax !! Or did  
> I forget
> something  in Antennas 101 in college ? Willy K3VW

A quarter-wave vertical with radials is definitely unbalanced.  A  
half-wave, center fed vertical is balanced if it is sufficiently  
elevated (with the feed perpendicular).  Most are probably "semi- 
balanced", since the capacity to ground is different for the two  
halves and/or one half will be more tightly coupled to the feed line.

Bob, N7XY