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As a result of the nature of the jamming transmitters and the way
that short-wave frequencies work, (I don't wish to go into a long-winded
explanation) if the antennae work at all in this situation, they
will work probably most effectively on the frequencies in the 25m
waveband that SWRA are currently using, and any higher frequencies.
They are cheap and very quick and easy to make.
SWRA thanks this 'anonymous' listener
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