xbee antenna

We recently bought 900 Mhz xbee modules. We want to use our antennas from the kits we used to have. However there are different size and shape of 900 Mhz and 2.4 Ghz antennas in a box and we cannot differentiate them. What is the method to tell an antenna is for 900 mhz modem.
Thanks

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  • Slap them on a wifi adapter and see how the performance is.

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