[TowerTalk] Measure / Check phase difference between two antennas?

[Joe Subich, W4TV]

That is the case ... at least for horizontal antennas over ground.

I was playing with thoughts of vertical beam steering - primarily
for VHF use - but with antennas less than four or five wavelengths
above ground (e.g., HF + 6M), phase differences even approaching
90 degrees had very little effect on the take off angle.

Things got messy around 90 degrees difference but fairly quickly
jumped to the "out of phase" condition.  As I recall (it's been a
few years), the loss of forward gain for even 45 degrees of phase
difference was less than 1 dB with no significant null fill.

73,

    ... Joe, W4TV


On 2026-03-12 11:44 AM, john at kk9a.com wrote:
> Regarding your " The last question is a real use case"  I believe that Yagi
> phasing is not super critical.  Your phasing between two dissimilar Yagis
> may be off but close enough for the stack to still work.  This should be
> easy to model.
> 
> John KK9A
> 
>