[TowerTalk] 160M Wire Antenna

[Bill Turner, W7TI]

>On Fri, 21 Apr 2000 07:03:43 -0700, "Al Williams"
><alwilliams@olywa.net> wrote:
>
> >
> >My observations using EZNEC are that all horizontal single wire antennas
> >(except several wavelengths)
> >under ~100' high radiate about equally i.e. straight up!
> >
> >The only difference is how easily they tune.
> >Any disagreements?
> >
> >k7puc
>__________________________________________________________________
I'd agree that the MAXIMUM radiation is straight up, but a 160 meter
inverted vee with the apex at 100 feet and the legs 90 degrees apart
is only 5 db down at a 30 degree takeoff angle.  Not as good as a
vertical over perfect ground, but not too bad either.  Lots of DX can
be worked with that.

Another interesting characteristic of inverted vees is that when the
apex is roughly 1/4 wavelength high or less, they are almost perfectly
omnidirectional in the azimuth plane.  There is no "donut" pattern
typical of horizontal dipoles.  This is not always desirable, but it
does mean that you can orient it any way you like without having to
worry about either favored or null directions.

W7TI



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