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No Donald, I don't think you don't understand my point.


The feed point on this antenna only changes with height.


I know you just made a mistake, because I remember you telling me categorically that you modeled a Sigma 4 or a Vector 4K design, six ways from Sunday, and it was definitely a collinear antenna, not a J-Pole, and for sure was not an elevated 1/2 wave, but instead is a non-apparent collinear, whatever that means.


Do you remember what the feed point symbol in Eznec looks like? I'll give you a clue (O)


So, take a look at my model below for this antenna and see if it reminds you where the feed point actually is...on the Sigma4 design idea.