On 26 Jun, 20:52, John Smith I wrote:
art wrote:

...

but it does come to mind that the aperture, which is related to gain,
...
Regards
Art

Yes Art, this IS the most perplexing of all ... the aperture ...

How can you reduce an antenna with a "capture" of 1, to a "capture" of
.3333333 and not suffer a signal loss of related proportions.

I ponder this.

Regards,
JS

Look at the antenna book by Jasik , small antennas
section, where he shows examples of the increased aperture
by adding a top hat. The aperture diameter INCREASES
because of the side projection of the top hat, at
least thats the way he shows it.
Difficult to determine the fulcrum point for all cases shown
with a cursury look.
Regards
Art