The Series 240-NRL from Flann is a range of horn antennas that operate from DC to 40 GHz. They have a gain from 13.7 to 24.7 dBi and a VSWR of 1.2:1. These horn antennas comply with U.S. Naval Research Lab Report (NRL), report no. 4433. They are ideal for measurement standard and calibration applications. Standard and special flange options are also available.