Hi Every one
I build such an antenna for holiday use.
Tried it against a minoband vertical GP on 20 mtrs.
There was no difference noticable at all.
I made a lot of nice contacts during my holidays.
The radiator was 5.5 mtr 17 foot and the only one radial was also 5.5 meters 17 foot.
Both the radial and radiator were completely isolated from mast and only atached to the balanced wire.
The radiator was vertical and the radial was running to the ground at about 45 degrees.
I used aluminium mast of about 8 feet.
This antenna worked good from 15 to 40 mtrs, I didnt have time to try it on 10 and 12 meters and there was no propagation on these bands.
For all advicers to use several radials per band , they are totally wrong , to keep a little balance in this antenna the radiator and radial should be the same electrical length.
For other balance problems atc.
Just try it and see how your antenna performs.
We have tried 10 mtr long elevated verticals on 2 mtr high poles, verticals without radials and fed with 6 mtr 600 ohm balanced lines.
Just a single side of the balanced line connected to the vertical and made wonderfull dx qso's on 40 and 80 mtrs with ssb anf 100 watts from Japan to Venuzuela to the US on 80, on 40 mtrs and 20 mtrs even VK.
in theory this antenna should not work good , in practice it wasn't bad at all.
On 20 mtrs this vertical zepp performed so good we even tried phasing 2 and even 3 of these antennas on a line with a half wave of dictance between each of the 2 or 3 verticals and it worked perfect.
You can see these phasing experiments on:http://blogs.hamstart.net/blog02/archives/33
With 3 verticals the switching in direction is done by simply connecting only the middle antenna to the other open wire.
For all simulators in EZNEC just simulate it and try it, it works great.