Why would it matter where it's fed? A half wave dipole has the same current 
distribution regardless of the feed point. 

Wes. N7WS


On Jun 27, 2014, at 5:51 AM, K8JHR <jricha...@k8jhr.com> wrote:

> Hmmm....   vertical dipole... vs... end fed half wave vertical "dipole"  - 
> not sure these are equivalent in performance.  I know W8JI thinks the end fed 
> half wave needs some sort of ground system-counterpoise to keep the feed line 
> from becoming part of the antenna, so I am wondering - asking not telling - 
> whether these two are really equivalent?  (He said reaching for his ARRL 
> Antenna Book...)
> 
> I believe Jim K9YC modeled a true vertical dipole  (including the n6BT 
> end-loaded vertical dipole) - but I would expect it to work out differently 
> from an end fed half wave vertical.  The GAP antennas and Cuschraft R8 and R9 
> type are supposed to be loaded vertical dipoles, and are not, I don't think, 
> end feds... but that is the question... are these really all equivalent?  
> Certainly feeding at the bottom of an end fed would be easier from a 
> construction and deployment point of view, so I can see the obvious appeal 
> therefor, but then does it work as well as, say, the N6TB vertical dipole fed 
> in the middle?
> 
> 
> 
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