Interesting. I did a similar test a few years ago
with a station about 20 miles away. My 40-2CD is at
72 ft and showed fairly deep front-to-side but also
had about 6 db front-to-back on 18 Mhz in favor of the
"normal" 40 M forward direction. Go figure! FYI...
--- Dave Hachadorian <firstname.lastname@example.org> wrote:
> I did a quick experiment yesterday with another ham
> a few miles away.
> The 40-2CD has only two broad lobes, broadside to
> the elements(6dB
> BW 120 degrees)on 18 Mhz. There is a sharp
> null, only a few degrees wide, of about 18dB off the
> side. The
> front and back lobes are identical in amplitude and
> shape. SWR
> was 2.4 at 18.1 Mhz. Pattern amplitudes were
> measured with a step
> Dave Hachadorian, K6LL
> Yuma, AZ
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