In order to meet the higher bandwidth requirements of 5G, the utilization of mmWave frequencies is deemed necessary. Bandwidth and data rates achievable using current technologies such as 4G LTE are not enough to satisfy a full 5G implementation. As a result, mmWave frequencies must be utilized in conjunction with LTE and all its variants to ensure seamless network operation and capacity expansion. This white paper identifies the test requirement complexities of 5G mmWave frequencies and the way a portable RF anechoic test enclosure from DC-90 GHz can provide an ideal test environment for OTA measurements.