The Model ATH2G18 is a wide band, high gain, high power microwave horn antenna. With a minimum gain of 6dB over isotropic, the Model ATH2G18 supplies the high-intensity fields necessary for RFI/EMI field testing within and beyond the confines of a shielded room. The Model ATH2G18 is extremely compact and lightweight for ready mobility, yet is built tough enough for the extra demands of outdoor use and easily mounts on the rear flange. Part of a family of microwave frequency antennas, the Model ATH2G18 provides the 2–18GHz response required for many often used test specifications. The ATH2G18 is ideally suited for use with the AR RF/Microwave Instrumentation Models 20T4G18A and 15T4G18A and other high power amplifiers in this frequency range.