Thinking again about this, we have missed out a stage. After measuring the
tuner output impedance, we need to make a temporary L network which, when
terminated with 50 ohms, looks like the antenna. Now put the MFJ on this
terminated network and measure it's R +/- jX values which will represent
the antenna.
Networks with loss are not always bilaterial.
Since tuners have unevenly distributed losses, they are not bilaterial.
If I adjust a typical tuner for 1:1 SWR into 50 ohms and reverse it, the new
input impedance will not be 1:1 SWR.
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