[2] High resistance amplifier So that ordinary radios can easily achieve aviation band reception. It can achieve good matching and operation with magnetic rods, passive small loop antennas, rod/whip antennas, and other antennas. Improve reception performance. [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. Can achieve high impedance antenna input matching for first generation malachite or standard 50 ohm input receivers and handheld devices., Weight: 0.2094391489 pounds, Manufacturer: tiyao