I think Wes has given you a nice explanation about _how_, but I'm
curious _why_ you want to know the Q of an antenna. (Beware...some
antennas behave as multiple coupled resonators, and it can be
misleading to try to assign a Q to a whole system of coupled
resonators. It makes some theoretical sense, at least, if it behaves
as a single resonator over the frequency of interest, though.)

Cheers,
Tom

"Massi" wrote in message ...
Hi to everybody,
I got the VSWR of an antenna from a Vector Analyzer and I'd like to know
(and how) if is possible to calculate the Quality Factor from it.
Thanks,
Massimo