This is the kind of thing that scares me with the NanoVNA. There are many different "possible solutions/problems" posted above that could all likely be valid issues. So this means you REALLY need to know exactly what you are doing and have a REALLY good understanding of all this to actually successfully use the NanoVNA as a simple antenna analyzer. Somebody like myself who is not very proficient or knowledgeable abotu all this "stuff", will likely have a hard time getting good results that can be counted on. And worse, I have no idea if my results are any good or not! As in the example posted, is the Rigexpert correct, or is the nanovna correct? Or is neither correct....?
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Regards,
Chris K2STP
Chris K2STP