[Elecraft] ARRL book on receiving antennas

[GWK]

We call it a "ground plane" antenna.

W3HBM

On 9/10/2018 2:48 PM, Walter Underwood wrote:
>  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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