la9xga wrote:
> Hello !
>
> I am running a VHF repeater with two vertical dipole antennas, one
> for tx and one for rx. They a mounted on the south leg of a 30m high
> square tower that is 1m x 1m at the top.
>
> I have no duplexer here, so that's why i use two antennas, and notch
> filters.
>
> I want to try to get a more omnidirectional pattern by using two
> vertical antennas with about 3db gain.
>
> What distance from the tower to the antenna should i use to get the
> best omnidirectional pattern ?
One wavelength, so for 2M, approx 6ft, although anything over abt 4 1/2'
will do OK.
>
> Will two vertical antennas work better than the dipoles i already
> have in use today ?
>
Guess it depends- are these single or multiple dipoles? A 4-bay dipole
will work as good, and in some ways better, than an end-fed vertical.
If what you have is just one dipole, than you'll get some gain with a
'vertical'.
> Thank you in advance for the reply
>
> 73's de LA9XGA "Tom"
>
--
Jim Barbour
WD8CHL
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