[TowerTalk] Effect of element shape was: Re: InnovAntennas contact info

[W1YW at aol.com]

It's only 'critical' in the sense that at some point mutual coupling kicks  
in at the closed-spaced nearfield. Its not a mystery. That's the principle  
behind metamaterials. A Moxon is a folded two element Yagi.Its not a  
metamaterial antenna.
 
NEC is not capable of accurately modeling such close spacings. Its listed  
as an error condition to avoid .
 
73,
Chip W1YW 
 
 
In a message dated 3/20/2013 2:56:54 P.M. Eastern Daylight Time,  
steve at karinya.net writes:

The  Driver/Reflector tip spacing is a critical element in the 
performance of  beams such as the Moxon, Hexbeam, VK2ABQ, etc. Take a 
look at Section 6 to  see how it affects the F/B of a  hexbeam:
http://www.karinya.net/g3txq/hexbeam/broadband_tech/

Steve  G3TXQ