Minimum Viable VNA N-to-N Test Cable for 2480MHZ
The cable should be fine, but if you calibrate at the end of the N-to-N cable and then add a N-to-UFL transition then another UFL-to-UFL coax cable, you'll have a problem with these transitions. If should be able to calibrate to the end of the last UFL connector close to the antenna input, that is more accurate.
You can make a calibration PCB, using same stackup/characteristics of your antenna PCB, or even just adding three terminations at some corner of your antenna PCB. Add three UFL connectors with an open, short and load (50 Ohm) terminations, respectively. Measure S parameters of each termination so that you can calibrate up to the antenna input.
You can create a set of calibration parameters from this SOL (Short, Open, Load) trio and load to the VNA, you'll have to check you VNA manual if and how this can be done for your particular model.
OR
You can measure the S parameters of the SOL loads, measure the S parameters of your antenna and then apply calibration afterwards in a PC using a script in MATLAB or Python. Check the scikit-rf package for Python, they have a page about calibration, can be very useful: https://scikit-rf.readthedocs.io/en/latest/tutorials/Calibration.html