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sp5it,  its not impossible,


impedance measured at the input of his coax does not determine vswr,


his antenna is mismatched to the line,

as you move away from the mismatched load along the line impedance will swing up and down while vswr stays constant for lossless or short lines,


since his coax has some loss vswr will measure lower at the input end of the coax vs at the antenna,


impedance on his analyser will be whatever his length of coax transforms the mismatched load impedance into at its input end.


vswr on his analyser will be the ratio of coax impedance to load impedance minus whatever loss he has in his coax.