The ETS-Lindgren Model 3301B is a broadband, high sensitivity Electric-Field Receiving Antenna. The unit is composed of monopole rod antenna with a counterpoise and a broadband, high impedance pre-amplifier. The unit is designed to provide reception of an electric field in a signal band without tuning or band switching from 30 Hz to 50 MHz. The 3 dB roll off points for the antenna factor are at 170 Hz and 30 MHz. Between 250 Hz and 20 MHz, the antenna factor is flat within +/- 1 dB. Despite the roll of the unit’s antenna factor, the usable range is 30 Hz to 50 MHz. The 3301B has been designed for maximum sensitivity and dynamic range. The 3301B is capable of sensing fields of dBuV/m at 1 MHz with a 1 kHz bandwidth. However, it will not saturate below a field strength of 0.7 V/m. Hence, the unit boasts an extremely wide dynamic range of 115 dB nominal at mid-band. In addition, at 10 and 30 dB (+/-10%) internal attenuators are provided. With the attenuators the unit is usable in fields of up22 V/m. Thus the dynamic range of the unit is expanded to 145 dB. A saturation indicator is provided to alert the user to the need for using the internal attenuators. The Model 3301B has been designed to provide the user with an extremely versatile measurement tool. Its flat antenna factor, extreme sensitivity and ultra-wide dynamic range make it a state of the art sensing instrument.