The important issue is what connector is used on your test setup- signal generator, receiver, or a VNA. Impedance may be 50 Ohms, some cases need 75 Ohms, etc.
If your antenna is to be used with a high power, find a connector that can handle it. Operating frequency is also important.
Most test equipment now uses SMA connectors up to 18 GHz, k-connectors up to 40 GHz. There are N-connectors usable to 26 GHz, and many transitions available as needed. Better quality means a higher cost , too.