AIR-AP1242G-E-K9 DUAL ANTENA

Hello to everybody,
I have a customer who makes me the follow ask:
He wants 1 AP1242  and put one antenne at the AP and another 3 meters beyond to give coverture on the other part of the wall.
It's possible to do? How?
Thanks a lot

Here is a link that will explain it:
http://www.cisco.com/en/US/tech/tk722/tk809/technologies_tech_note09186a008019f646.shtml
Thanks,
Scott
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