Topband: GAP Vertical Question

[Tom W8JI]

>>On 12/16/2012 8:31 AM, Tom W8JI wrote:
>
>>>    You likely had an antenna with 1/2 wave of wire spooled up on a short
>>>    fiberglass rod, which would never behave like a half-wave.
>
>>You are exactly right.  Unfortunately, this myth dies hard.
>
> Below is a link to a page on this topic from "ANTENNAS," 3rd edition, by 
> John Kraus.
>
> Kraus states in the middle of that page that the radiation resistance of 
> such an antenna is the same as a linear conductor of the same overall 
> height/length.
>
> http://i62.photobucket.com/albums/h85/rfry-100/Helically-woundVertical.gif
>
> RF

Everyone should know, by now, that radiation resistance in a simple single 
element is tied directly to ampere-feet of linear spatial area.

If we remember this, the E-H antennas, folded monpoles and dipoles, spirals, 
fractals, CFA's, isotrons, and all the other magically folded, curved, or 
bent antenna would all become the antennas they actually are.