Rarely discussed antennas are the Bobtail and Sterba curtains. Google
them. These produce a bidirectional narrow beamwidth pattern with low
angle gain, and are fun to build (measure, don't guess at the Sterba
phasing line Vf). With some simulation work it might be possible to
build a reflector that works to give them some F-B.
No radials for either. a link re bobtails
http://www.mdres.org/w7htj/antennas.htm
Check out W8JI's extensive work on curtains
http://www.w8ji.com/curtain%20sterba%20USIA%20array.htm
Grant KZ1W
On 6/14/2013 5:06 AM, PY1NB - Felipe Ceglia wrote:
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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