The EMCO models 3160-07 to 3160-08 are examples of a set of pyramidal standard gain horn antennae designed for use in Immunity Testing. Linearly polarized, medium gain, half power beamwidth (equal in both horizontal and vertical planes) and a very low VSWR over the operating frequency range. They can be used easily with a fixed antenna factor over the range. Pairs of antennas are also used in shielding effectiveness tests. Its performance is precise and predictable through design parameters. Input and output of the antenna are matched from 50W to 377W respectively. Comparison on measured versus computed gain and antenna factors of the EMCO horns have been found to be within ± 0.5dB. Therefore, such antennas are considered to be the standard reference for measurements above 1GHz. As per ANSI C63.4. The 3dB beamwidth in both polarisation planes is very nearly equal at approximately 30 degrees. These antennae have a detachable coax-to-waveguide feed, but come fitted ready to use with precision “N” connector. Mounting is with ¼ UNC receptacle on two brackets at 90 degrees. They are itemized as a set of two, as seen above.