Abstract: An apparatus for a mmWave RF scanner system is described that enables multiple modes of operation. The disclosed RF scanner may be configured to perform a variety of independent tasks, including antenna measurement in far-field or near-field mode, active array characterization, radome measurements, and material characterization. To achieve all proposed measurements, a nine-axis RF scanner system is disclosed. For all modes, the system may use a two-port vector network analyzer (100 kHz to 9 GHz) connected to a plurality of frequency extenders that increases the operating range from 75 GHz to 110 GHz. The system may also include a graphical user interface for autonomous operation in each mode.