For operation in the 30 – 150 MHz band, the entire structure is used as a broadband monopole. For the 150 – 1000 MHz band, the upper half of the structure operates as a discone radiator. The input VSWR on 50 ohms is less than 4.0:1 at all frequencies above 33 MHz.
A metallic ground plane at least eight feet in diameter, or a set of four ground radials, are required for operation of this antenna. For installations where a ground plane is not available, Model CA-3138GP can be used. This unit is supplied with detachable, bolt-on aluminum ground radials.
CA-3138 has been fully qualified to meet MIL-S-901C for Grade A Shock, and is designed to meet MIL-STD-167, Type I Vibration, and all Service Conditions of MIL-E-16400F for Class 2 equipment.
