The RAMI AV-17 is designed specifically for mounting to the underside of an aircraft, providing an excellent radiation pattern for air-to-ground communications. It has a 4-bolt mounting base and is low in profile. The antenna is designed to operate at speeds up to 350 mph and altitudes up to 50,000 ft. It has a drag force of 0.66 lb @ 250 mph. This antenna is a direct replacement for the COMANT CI 122. Product Specifications: Model    AV-17 Application    Airborne Communications Frequency    118 – 137 MHz Impedance    50 Ohms Nominal VSWR    3.0:1 Maximum Polarization    Vertical Pattern    Omni-Directional Connector    “BNC” Female Max Height    9.0″ RF Power Capacity    30 Watts FAA TSO    C37d, C38d