The ATH33G50 from AR RF/Microwave Instrumentation is a Microwave Horn Antenna that operates from 33 to 50 GHz. It provides a gain of 20 dB (over isotropic) and has a VSWR of less than 1.2:1. The antenna can handle CW power of 240 W. It is used to measure gain for other antennas by comparing the signal level of a test antenna to the signal level of a standard gain horn antenna and adds this difference to the calibrated gain of the standard gain horn antenna. The antenna measures 4 x 3 x 9 cm with WR 22 waveguide connector and is ideal for RFI/EMI field testing, dual-channel antenna test receivers, and pickup horn for radiation monitoring applications.