[TowerTalk] Tribander Spacing

[Jim Lux]

On 2/20/15 6:54 PM, Bill via TowerTalk wrote:
> Agreed it runs into trouble with spacings less than .5  wavelength.
> However, I have found that performance in the real world seems  to be on the money
> for spacings greater than .5.
>

when you get closer than half a wavelength (maybe even farther if the 
Yagi is particularly high directivity), then the near fields of the two 
antennas interact, which HFTA does not model.  NEC is your friend in 
that case.