[600MRG] Very low halfwave dipole for 630m

[Brian Pease]

I have been using a full-size 630m dipole 2 meters above poor ground 
(roughly .002S/m) for almost 2 years in Vermont woods.  It is bare 
aluminum wire strung between trees on electric fence insulators. 
Orientation is 210 degrees true.  With a 100W amp I get 1W EIRP vertical 
radiation off the ends.  It has nice (measured) nulls off the sides at 
ground level as predicted.  For example, last night on WSPR I was 
spotted by 21 stations including TX, OK, WA, and Vancouver Island.  The 
latter station is only 2 degrees off the broadside (vertical) null at 
3896km range.  I have reached Europe many times, including Ireland 2 
nights ago.
I erected a 50 ft high almost-resonant L last fall, but it it is about 
3dB worse than the dipole in ground wave tests .  Obviously grounding 
needs improvement, but this shows the possibilities of low horizontal 
antennas over poor ground.  I will try to erect a full wave loop this year.

On 3/17/2015 11:23 AM, Dick Bingham wrote:
> GM Everyone - Steve, many thanks for sending this article to the group
>
> Since my antenna at CN98pi suffered a big 'hit' from falling limbs early
> this Winter
> it looks like this German's efforts are worth trying before re-installing
> the old antenna.
>
> 73 - Dick/w7wkr (CN97uj)  and wd2xsh-26 (CN98pi)
>
> On Tue, Mar 17, 2015 at 6:28 AM, <sbjohnston at aol.com> wrote:
>
>>
>> My inverted-L antenna continues to perform well, but I came across this
>> interesting article on using a very low halfwave dipole for operation on
>> the 630m band:
>>
>>
>> https://dl.dropboxusercontent.com/u/19882028/MF/A%20full%20size%20dipole%20for%20the%20630%20m%20band.pdf
>>
>> If ground conductivity is very low I bet one could just lay it on the
>> ground.
>>
>>
>>
>>
>> Steve WD8DAS
>>
>> sbjohnston at aol.com
>> http://www.wd8das.net/
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>>
>>
>>
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