[TowerTalk] vertical performance

[Jim Brown]

On 12/22/2010 7:32 PM, David wrote:
> I want to  run 20 feet of RG213 from the tuner to the top of a 10 foot section of tower and then to an unun with the output of the unun to a 15 foot vertical mounted to the top of the tower.   Should I use a 1 to 1 or a 4 to 1 unun?

This depends on several factors. First, what is the impedance at the 
feedpoint of that vertical?  What is the frequency?  How long is the 
feedline back to the shack?  How much power?

73, Jim K9YC