Hi Bob:
In general, elevated radials are strongly resonant, and need to be treated like
a radiating part of the antenna (because they are). This means making sure that
current is shared equally between the elevated radials, that they are decoupled
from ground., etc.
One of the best references, including experimental results, is provided by Rudy
Severns, N6LF. Here's a link to his site:
http://www.rudys.typepad.com/
-- Tom, N5EG
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