Hi Doug,
A year or so ago I posted a report on a experiment with various numbers of
radials on a 160 m vertical. It's still posted on my web site,
antennasbyn6lf.com (experiment #1) and you might want to read that as it
directly addresses you question.
Since that time I have conducted a very extensive set of additional
experiments on verticals and radial systems. These include a direct
comparison between a few elevated radials and lots of ground radials.
Reports on all of these experiments and a description of the test range and
instrumentation are now on my web site and can be downloaded.
In one of the experiments I added a ground screen over 64 radials and was
not able to detect any difference with or without the screen.
73, Rudy N6LF
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