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MF
A couple of elevated insulated radials will out
perform dozens of buried radials, in fact 1 radial is vy effective, even
insulated radials lying above ground are also efficient.
I use 2 insulated 1/4 wave elevated radials on 500
khz and several lying on the ground for 137 khz.
Using a loading coil in an elevated position on a
vertical helps but remember twice as many turns are required as opposed to base
loading hence more resistance, you might not be gaining as much advantage as you
think.
de mal/g3kev
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