The Aztec (spelling???) and the HyGain BN-4000 are the best baluns I have
seen made commercially and for reasonable cost.
However, my experience has shown that changes in the length of the coax
feedline, even by a few feet, changes the swr and loading settings on the
rigs. I don't know nor care why. I just have seen this happen so many
times as to have lost count. With baluns, without, on beams, quads, open
feeders, dipoles fed with coax, etc. de K4VUD
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