The measurement antenna paired with the device under test (DUT) creates the over-the-air path for the wireless device. In The Howland Company's distributed axis systems, the measurement antenna mounts on the theta boom and is connected via RF cables to the power measurement device(s) and/or base station simulator.
Desirable characteristics for the measurement antenna include:
Dual linear polarization
Light weight
Good port-to-port isolation
Low cross polarization
Low return loss
Smooth, predictable main lobe performance