I'm with Jerry KE7ER.
I've tested many (large number ) of antennas. You calibrate to the end
of the cable and you get an answer that is correct. However the cable should
not be some old dead section that has unacceptable loss for any conceivable use.
That works correctly with a very expensive VNA/PNA or NanoVNA.
If getting to the end of the cable use a different one for the occasion. I've done
this for many times when testing elevated antennas.
Be wary of one one thing is the cable is an intrinsic part of the antenna such
as in an End Fed testing as the original poster wanted (remote isolated VNA)
you need to simulate the operating configuration. If you literally had a nanoVNA
with Wifi connect at the end of an end fed with out coax shield connection you
would get erroneous data.
Allison
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No direct email, it goes to bit bucket due address harvesting in groups.IO
