My D-40 exhibited a fairly narrow bandwidth when I used a ferrite-bead
current balun, but when I replaced it with a coaxial solenoid choke, the
increased and the SWR exhibited the manufacturer's specs.
There's a moral in there somewhere...
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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