As Nigel said, no need for complications here. Just calibrate at the end of the cable and you're fine.
The only requirement for the cable is to not change its properties between calibration and measurement.
Usually the problem is phase stability, when the cable is moved or the temperature changes (Sun shine on cable...).
You can check for cable problems by attaching a load at the end (after calibration), moving the cable around a bit and checking return loss on the VNA.
So, measure immediately after calibration, and don't move the cable much between calibration and measurement.
The cable length and exact impedance is not important, when you calibrate at the end.
But of course, the greatest advantage of the nano is its extreme portability, so why not just bring it out to the antenna??
Marko Cebokli
