[TowerTalk] HF2V Elevated or On Ground
jimc at pwrone.com
Wed Nov 13 22:55:29 EST 2013
Interesting results. At my old QTH, I had a DXE 40/30M vertical with the
base mounted at 28¹ on top of my shed with 10 elevated radials. It worked
great. Now at my new QTH I have a 90-100¹ hill (toward EU/AF) about
600-700¹ away. I might try an elevated top loaded vertical and raise it
as high as possible to try overcome some of the less than stellar terrain.
I knew my old AB-577 mast would come in handy some day!
PowerOne Corp./PowerOne Environmental
2325 Dean St. Suite 200
St. Charles, IL 60175
On 11/13/13, 7:42 PM, "Jim Brown" <jim at audiosystemsgroup.com> wrote:
>On 11/13/2013 12:48 PM, James Setzler wrote:
>> Anyone else have experience with the HF2V mounted up using elevated
>> versus ground mounted with limited on-ground radials.
>Over the summer, I did extensive modeling (NEC) of vertical quarter-wave
>and vertical dipole antennas, comparing performance on the ground and at
>typical roof heights. A report on that work is on my website in the form
>of a pdf of the Power Point for a presentation I did at Pacificon last
>The executive summary -- for all vertical antenna types and almost all
>soil quality, roof mounting outperforms ground mounting. The advantage
>of roof mounting is greatest for the poorest soil, varying from as much
>as 8 dB for very poor soil to a dB or so for extremely good soil.
>I did one series of signal strength measurements on a real antenna -- a
>20M vertical dipole that was first measured with the base at ground
>level, then at 10 ft, 20 ft, 30 ft, and 40 ft, and finally with the
>center on the ground and the bottom half horizontal (at W6GJB). The
>difference between 0 ft and 40 ft was 10 dB over a 5 mile path (to a
>vertical antenna at my QTH). The soil at his QTH is quite poor.
>73, Jim K9YC
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>TowerTalk at contesting.com
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