Xbee and Hawkign Antenna

i wanna take an xbee pro, and a hawkign antenna, and hook the two together... will it work? is it even worth it (does it even boost it at all?)?

these are the specific items:

Xbee XBee Pro 900 RPSMA - WRL-09099 - SparkFun Electronics
Antenna http://www.amazon.com/Higain-Directional-Antenna-Outdoor-Weather/dp/B000B5GFQM/ref=sr_1_83?ie=UTF8&s=electronics&qid=1266370759&sr=1-83

It is a high gain antenna and will increase the range of an xbee greatly, the thing I found strange was that I could not find any details about the antenna, eg what frequency it was tuned for.

If you order one make sure you get it to suit the frequency of your xbee, also you will need the right connector on your xbee, or get adaptors to suit.