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.
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