Where would this be used? The EM-RVR-25A is primarily used for Radiated Emissions testing to measure electric field emissions generated by the Equipment Under Test (EUT). The RVR25A remote 41” rod antenna transforms the electric field component through ten passive transformer matching circuits from 10kHz-30MHz in 10 octaves. The antenna can be used independently with a BCU-25 battery unit which screws into the antenna base, allowing band switching via a front panel rotary switch. Please specify how you wish to use the antenna.