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Finding resonant freq of a antenna using S11

Question asked by chuckinnc on Dec 21, 2006
Latest reply on Dec 22, 2006 by Dr_joel
As in my previous post i am trying to identify a big batch of unknown freq mobile & portable antennas.  I have been trying to find the bands they were designed for by using 8720 analyzer set to S11 return loss and then switch to smith chart to check for 50 ohms.
Problem is that they are not coming up close to the frequency i think they should be, even a known factory antenna also comes up either
higher or lower that it should be.  Am i missing something here?