Hi Iain

You are displaying the far field radiation pattern, not the close-up
energy density...

ie the antenna and height above ground is very small compared to the
radiation pattern being displayed.

Cheers Bob

Iain Kelly wrote:


Now, logic says to me that the radiation should be coming from the
driven antenna elements rather than a point on the ground beneath them.

Am I missing something really simple here?

Many thanks in advance. :-)