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This paper discusses the radio channel modeling for MIMO Over-The-Air testing (OTA). The MIMO OTA is needed for the small devices testing, utilizing multiple antennas. The technologies that utilize multiple antennas are emerging technologies, such as LTE-A and WiMAX evolution (IEEE802.11m), but we also have seen tremendeous increase of MIMO in WLAN type of applications, like IEEE802.11n. This paper discusses also about the testing challenge that MIMO poses for realistic testing.