Felipe,
I would use three multiband quarter-wave verticals, spaced, aligned and
phased to provide some directionality, gain and F/B on your bands of
interest. The "driver" could be either a commercial multibander or a
homebrew V-type vertical, with multiple elements coming up from the
feed-point. That could provide low-SWR on all three bands, without the need
for any active switching. You will need radials under all of them.
A four-square would be nice, too, but only if you need to vary the
direction. You would need a different one for each band.
Wanting some gain and F/B rules out single verticals or vertical dipoles.
A vertical tribander is basically a vertical dipole with a reflector and
director. It would either need to be pretty high, or you would need radials,
etc. It would take some design work to get it right.
73, Rick ZL2HAM
-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of PY1NB
- Felipe Ceglia
Sent: Saturday, June 15, 2013 11:52 AM
To: Matt
Cc: reflector -tower
Subject: Re: [TowerTalk] FW: vertical antenna advice needed
Hi Matt,
Fixed direction, low angle for DX usage.
73,
Felipe Ceglia - PY1NB
----------------------------------------------------------------------------
---------
PR1T team member /// Rio DX Group member /// Araucaria DX Group member
http://dxwatch.com /// http://reversebeacon.net /// http://riodxgroup.com
On Fri, Jun 14, 2013 at 7:31 PM, Matt <km5vi@flukey.cc> wrote:
> Do you need mention but are you looking for variable or fixed
> direction gain? Also is wave angle important - if so what angle?
>
> Matt
> KM5VI
>
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
> PY1NB
> - Felipe Ceglia
> Sent: Friday, June 14, 2013 7:07 AM
> To: Tower and HF antenna construction topics.
> Subject: [TowerTalk] vertical antenna advice needed
>
> Hello folks,
>
> I'd like to hear your opinions about this topic.
>
> I am looking for an antenna (or more than one) for 10/15/20m that has
> the following characteristics:
>
> - vertical polarization
> - smallest possible horizontal far field lobe
> - "good" forward gain (at least comparing to a single element
> vertical)
> - greatest possible front to back ratio
>
> I was thinking about using:
>
> - a tribander tilted 90 degrees
>
> - 2 element end phased array of:
> - vertical dipoles
> - sitting on the ground verticals (with or without radials?)
> - multiband verticals (using W9AD phasing line to switch between bands)
> - 5/8th wave verticals (at least for 10m, it would be easy to
> convert CB
> antennas)
>
> - a 4 square
>
>
> These antennas would be used for RX only.
>
> Any suggestions, anecdotal comments, field experiments?
>
> 73 and thank for your time,
>
> Felipe Ceglia - PY1NB
>
> ----------------------------------------------------------------------
> ------
> ---------
> PR1T team member /// Rio DX Group member /// Araucaria DX Group member
> http://dxwatch.com /// http://reversebeacon.net ///
> http://riodxgroup.com _______________________________________________
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