Re: Underground Antenna Experiments on 160 meters.

You might be interested in the 1918 article on underground antennas.
http://www.rexresearch.com/rogers/1rogers.htm

"Roy Lewallen" <w7el@xxxxxxxxx> wrote in message
news:11elmqalhrhfl32@xxxxxxxxxxxxxxxxxxxxx
> Michael wrote:
> > This has been done since the beginning of radio. Nothing new. However, I
am
> > interested in the sand antenna. I would love to hear more about working
> > antennas that exist entirely below ground. I am guessing but would say
this
> > would not work on any band above 160 meters. I know the Navy has made
huge
> > underground radiators at frequencies like 50 khz. I would be surprised
to
> > hear that something as high as 1.8 mhz could be made to work.
>
> I recall reading some years ago about underground antenna experiments
> done by the military. I believe the were done well into the HF range. A
> trench was dug, the antenna put into the trench but not in direct
> contact with the soil, then the top was covered. The objective was to
> make a concealed antenna for relatively short range communication. The
> signals were much weaker than for an above-ground antenna (~30 dB if I
> recall correctly, but I might not), but still usable for the purpose at
> hand. This shouldn't be surprising.
>
> Roy Lewallen, W7EL


.

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  • Re: Underground Antenna Experiments on 160 meters.
    ... A trench was dug, the antenna put into the trench but not in direct contact with the soil, then the top was covered. ... The objective was to make a concealed antenna for relatively short range communication. ... This shouldn't be surprising. ...
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