i dont know what you mean....you have been simulated in software or no?...
you can use network analyzer and chamber room (just like room that isolated from external signal)...to get real VSWR and Return Loss and to know the real bandwith
The best option which i think would be to contact some higher education institute/university in your locality having antenna measurement facilities..
To measure the S-parameters you need a network analyzer whereas to measure the radiation patterns of the designed prototype you need to look for an anechoic chamber.