> Today just for fun I measured my K9AY system from the shack end of the
> coax using an MFJ-259B...
> 73 Frank VO1HP
The K9AY Loop (and other terminated small loops) are non-resonant. SWR is
largely irrelevant unless you have exceptionally long feedlines or you want
to phase two or more identical antennas. The unit was designed for best
match into 50 ohms, so the 1.6:1 you see at 1830 is no problem. You will not
find a measurable degradation with 75 ohm line.
The "resonance" you see is simply the frequency where the matching
transformer was designed to provide a reasonable impedance match.
Interaction with nearby antennas will have only a minor effect on this
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