[Elecraft] ARRL book on receiving antennas

[Walter Underwood]

From the official WWV site, the bottom element is a sloping skirt that also serves as guy wires. Sort of like a discone with the disc replaced by a vertical element, I guess.

"The top half of each antenna is a quarter-wavelength radiating element. The bottom half of each antenna consists of nine quarter-wavelength wires that connect to the center of the tower and slope downwards to the ground at a 45 degree angle. This sloping skirt functions as the lower half of the radiating system and also guys the antenna."

https://www.nist.gov/pml/time-and-frequency-division/radio-stations/wwv

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Sep 10, 2018, at 11:41 AM, Jim Brown <jim at audiosystemsgroup.com> wrote:
> 
> On 9/9/2018 7:02 PM, Wes Stewart wrote:
>> The WWV antennas are center-fed vertical dipoles. 
> 
> Thanks for the reminder about this -- I vaguely remember reading about their antennas years ago.  Question -- from the description, is the feedpoint higher than a quarter wave above ground?  A few years ago, I did an NEC modeling study of HF verticals that showed that doing that improved the vertical pattern and seemed to suggest that it reduced ground losses. Your thoughts?
> 
> The study is here.  http://k9yc.com/VerticalHeight.pdf
> 
> 73, Jim K9YC
> 
> 
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