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11-29-2012 07:38 AM. I think you are right, once I removed the internal radio AIR-MP20B, it joins to the WLC with the RM22A-A-K9 5Ghz antenna adapter. I've also swapped the internal radio with AIR-MP21G-E-K9 and both radio joins to the WLC normally. Therefore, I guess that the AIR-MP20B is not supported. qq289 slot