We currently have a problem with our 12dBi, 2.4GHz Cisco antenna. We don't know if the antenna is defective or not. We have more than 10 1242AG LAPs in an outdoor site and eath of them has 5.2dBi antennas. We are using a 4402-50 WLC. We replaced one LAP with a 12dBi antenna to test how strong the signal coverage would be. The result was it has a lower signal coverage than the 5.2dBi antenna. We don't know why it was like that. We are suspecting that the antenna maybe faulty.
Hope someone here can help.