The EH118 EMC Horn Antenna operates from 1 to 18 GHz and provides a stable gain performance with low VSWR. The horn is single linearly polarized with excellent cross-polar discrimination. Its unique horn design suppresses any possible excitation of higher order modes in the aperture and maintains a well-defined smooth radiation pattern in the direction of the boresight axis throughout the operational bandwidth. This Dual Ridge Horn Antenna has been developed for EMC/EMI Applications.