Antenna‐coupled point contactn‐Ge/tungsten Schottky diodes have been used to detect CO2laser radiation, and a very clear antenna pattern is obtained for an electric field polarized in the plane of incidence. The polarity of the detected voltage of the diode at low frequency and CO2laser frequency regions indicates that the nonlinearI‐Vcharacteristic of the diode at low frequency persists up to the CO2laser frequency.