The same thing (compactness) could have as easily be arrived at by
using in dependant wires, all cut to quarter/halfwave and bundled
together.

First, since I am new to this ng, let me say hi to all.

Now the good stuff. I have always wondered this, but
like a multi band dipole, the reactance would lead the power to the
radials that are reasonant, and make the unreasonant radials invisible?
Would they have to be spaced apart, or could they be 'bundled'
(but not touching)...
I ask because I was thinking of making a 20/15/10M ground plane out of
an old copy of Ham Radio Anthology from 2003. They only have one radial
for 20 and 15, two for ten. And I was wondering why not just
piggy-back reasonant wires for all the bands..You may have answered
my question.

Sorry to interupt, but thanks for the info!

Tim
WN8OAB