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http://focus.ti.com/lit/an/swra161/swra161.pdf has a lot of information about antennas. From there, you can look for some of the other reference designs (even for other 2.4 GHz parts) that use chip antennas and see how they are implimented. Copy that part of the layout would be best, be sure the antenna you choose can handle the extra power of the CC2591.