Hi Paul, Without modeling your antenna, I don't know what the feedpoint impedances are, but it's a good thing that you can match them with the KX-1. The 20 foot length of coax is transforming the impedance to something outside the range of your KX-1, and a balun wouldn't help unless (perhaps) it was also an impedance transformer.
Hope this answers your question. 73, ed - k9ew
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