Hello Stewart,
I have tested this on an open perfectly flat country site. The test site was
located on an inland dyke, which itself was 6 metre above the surrounding
fields.
Raising the antenna gave much more signal.
The screening from the surroundings is also a fact. In my suburban city
location, signal strength is considerable less (14 dB for the same height)
than in an open field location.
Fortunately this does not impair reception at all, as s/n is the same.
Besides a theoritical point of few, the stronger signals on a higher pole
are irrelevant as the main problem with this type of antenna is the massive
signal levels produced. Not the lack of it!
Best regards,
Roelof Bakker, pa0rdt
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