Why An antenna analyzer is a low-power swept RF source with an SWR/impedance bridge, so anything that changes impedance versus frequency shows up on it. Feed a known length of coax with an open or shorted far end and the frequencies where it looks like a short or open give the velocity factor; run that backwards with a known velocity factor and you get the cable's electrical length, which finds faults or trims stubs. Couple a small link coil from the analyzer loosely to a tuned circuit and the dip in the reading marks its resonant frequency. All three measurements are standard uses of the instrument.
Watch out Each single-item choice is a genuine analyzer measurement, so picking any one of them alone leaves out two other things the same instrument does.
Antenna analyzer = impedance vs frequency; if a dip or peak reveals it, the analyzer can measure it.