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That picture is showing a phase angle between 0 and 170 degrees.

I was under the impression the question was:

 ....where do those angles come from, how is it possible that we only "read" o to -170 where you are expecting them to go from + through "0", beeing negative and and up at "0"  again at the top of the antenna.


If one looks from above at the antenna the phase angle goes from 0 to -170 degrees just like eznec says..

Your looking to the side of the antenna and expecting the angle to be "o" at the center of the antenna

......its a bit more 3D ...

Does that sounds logical ?


of to bed now..didnt do much work hihi.