LAST MODIFIED:
My friend Jim Duffy once said "Whatever antenna you chose, if it is fed with coaxial cable you should use a choke balun. This will prevent the feed line from becoming part of the antenna which can cause all sorts of problems. There are many designs to chose from. My favourite is an air core balun wound from coax".
Essentially, a choke balun is designed to "divorce" your antenna from the feed line. If your feed line is coaxial cable then you don't want it to be part of your antenna. You want to be able to deliver all your power to the radiator itself, i.e. "the antenna". A choke balun does this admirably.
earlier tutorial on Active Receiving Antennas
Newer Active Receiving Antennas tutorial
antenna basics
low pass filters
high pass filters
narrow band filters
reactance tutorial
earth dangers
baluns
impedance
inductance
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