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Actually, Marconi, of the antennas I've used only the Astroplane came to  mind as one I'd bother attempting such a thing. This is due to the  limited ability i have to mount an antenna upside down. Anything else  would have to hang upside down from its current feedpoint height and  result in the antenna being lower than it is removing any real  comparative results.





Adding this post to the thread gives a fuller picture of expectations for this kind of inverted maneuver. Thanks.


I would be very, very interested in  this piece -  ". . . fact the physical length of the cone section must line up with the first  electrical 1/4 wavelength of the main radiator. This is important to  confine the undesired radiation taking place inside the cone. Since the  electrical length of the cone and loop combined must also equal 1/4  wavelength, there is only one ideal dimension that meets all of the  requirements."

 

Is there a number/dimension that is knowable, or is one stuck having to guess he got it right?  Real life tests are so subjective,