The OBS-840 is a compact, moderate gain, moderate VSWR, circularly-polarized cavity-backed spiral antenna designed to transmit and receive in the frequency band of 0.8 GHz to 4.0 GHz.  The antenna exhibits an excellent impedance match and radiation pattern.

It is capable of receiving both linearly polarized signals and a circularly polarized signal.The linear gain (dBil) is about 3 dB lower than the circular gain (dBic).

Model：
Maximum：4