Roy Lewallen wrote in message ...
That's much, much more difference than can be explained by the different
conductivities of the metals. Either some very resistive alloys are
involved, or there are differences between the antennas other than the
type of metal.

Roy Lewallen, W7EL

By the way, I found a very nice and complete listing of conductivities
of aluminum alloys at
http://www.ndt-ed.org/GeneralResourc...ctivity_Al.pdf
just after I posted last night. Others may find this useful. Even
the worst of them is not as much as three times the DC resistivity of
the best. So at RF, the worst aluminum alloy will have about twice
the loss of the same diameter copper conductor.

Cheers,
Tom