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A tip:

To avoid breaking the SMA base on the NanoVNA,
leave the small original SMA cords and place the SMA <-> BNC transition at the end of the cord. With the calibration, this length is neutralized

Making measurements on an antenna fed at the end is not very useful. The measurements have no meaning.

Mount your antenna at height, with its onboard transformer. Connect the transformer to your station by a coaxial cable. If possible, ground the station input and take the measurements at this level. You will see the Antenna + transformer + cable effect. In any case, you will be forced to install an impedance adapter at your station.

You can have fun making measurements on a transformer alone but that will not prejudge the real behavior with an antenna because of the antenna reactive that you will not be able to simulate with the transformer alone.
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F1AMM
Fran?ois