[1] With it, it is possible to downconvert the 118MHz to 138MHz aviation band to a regular radio, which can cover the received SW shortwave band. It can achieve good matching and operation with magnetic rods, passive small loop antennas, rod/whip antennas, and other antennas. Improve reception performance. So that ordinary radios can easily achieve aviation band reception. [2] High resistance amplifier Can achieve high impedance antenna input matching for first generation malachite or standard 50 ohm input receivers and handheld devices., Manufacturer: Fuhjythy