[Lf] Different types of antennae]

[Andre' Kesteloot]

Lyle Koehler wrote:

> Michael Mideke published the results of a terrain experiment a number of
> years ago. His experiment compared transmitting results with 3 antennas,
> each consisting of a 32 to 36 foot vertical with a substantial top hat,
> and with identical currents at the antenna bases. Site 1 was wooded and
> in a valley, Site 2 was mostly brushy with scattered oak and pine trees,
> on a small plateau halfway up a hill, and Site 3 was surrounded by brush
> ranging in height from 2 to 8 feet but on the top of a hill. Mike's
> brief article doesn't give the elevation differences between the three
> sites but I would guess that it was in pretty mountainous terrain.
> Relative ground wave signal levels at distances of 25 or more miles were
> 0 dB for Site 1, +12 dB for site 2, and +20 dB for Site 3. Site 1 was
> never heard at more than 50 miles; best DX for Site 2 was 220 miles, and
> Site 3 was copied at 2000+ miles (apparently this was California LowFER
> beacon "Z2", heard in Hawaii).
>
> As for feeding a grounded tower; BK's tower *is* grounded and has an HF
> triband beam and a 2m vertical on top as described on my web site. The
> hard part is isolating the ham antennas *and* their coax feeds from the
> grounded tower.
>
> --
> Lyle, K0LR
>
> http://www.computerpro.com/~lyle
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