Just a hint:
Think of how a turnstile antenna works. That one works in the
horizontal plane with 90 degree phasing. Check the radiation patern.


Reg Edwards wrote:
There is a 3-phase transmitter feeding a 3-phase antenna via a 3-wire
transmission line.

The antenna consists of three 1/4-wave horizontal radiators spaced at
120 degee intervals.

Is the radiation pattern in the horizontal plane perfectly
omni-directional?
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Reg.