Wideband pre-amplifier for scanners & receivers Frequency 25-2000 MHz gain 6-20 d B impedance 50 Ohms Rejects out of band signals Connection 1 X BNC socket 1 X Fly Lead with BNC plug Weight 180g Size 95 X 50 X 33mm This is inserted between the antenna cable down lead & the radio. It provides a marked increase in signal strength & helps pull in those weak distant signals. A must have accessory at an incredibly low price