[BC] 50 Ohms vs. 71 Ohms (AM Antenna Tuning)

[Cowboy]

On Monday 01 February 2010 09:33 pm, Scott Bailey wrote:
>  I have rather a stupid question to ask and I hope to get a simple answer. 
>  Is it best when tuning a tower that has a unipole on it to 50 ohms or 70 
>  ohms?  My unipole is tuned to 70 ohms and I wondering if I would get better 
>  efficiency if it was tuned to 50 ohms on the antenna side of the ATU.   

 The feed point Z has nothing to do with the radiation from a structure.
 It's the radiation resistance that is important, and not "adjustable" by
 any means save physical changes to the tower.
 The skirt is irrelevant in every respect.
 50, 70, 150, or 12. Makes no difference.

-- 
Cowboy