Where would this be used? The EMCO 3301 is primarily used for Radiated Emissions testing to measure electric field emissions generated by the Equipment Under Test (EUT). It can be mounted on a tripod or stand for flexible test setups. It is composed of three principal sections: a 41" sensing rod, a ground plane and a broadband, high input impedance pre-amplifier. Internal attenuators of 10dB and 30dB provide the ability to increase the upper limit of the antenna to 22V/m.