Function and compatibility: Supports switching between impedance mode and aviation frequency conversion mode to enable proper impedance matching. Compatible with magnetic rods, passive small loop antennas, rod/whip antennas, and other antenna types to improve reception. Input matching: Provides impedance antenna input matching for malachite or standard 50 ohm input receivers and mobile phones, broadening device compatibility. Aviation band downconversion: Downconverts the 118 MHz to 138 MHz aviation band to the shortwave band so ordinary radios can receive aviation frequencies more easily. Portability and power: Compact and portable design with a builtin 700 mAh battery and USBC charging for convenient use on the go. Practical advantages: A reliable tool for travelers and radio enthusiasts, enabling flexible antenna options, broader receiver compatibility, and easy aviationband listening on common radios. Use scenarios: Travel listening: While on the road or on a flight layover, connect to a portable radio and use the aviation band downconversion to monitor aircraft communications on the go. Field antenna setup: Pair with a magnetic rod antenna or a passive small loop to achieve stronger reception in challenging environments, such as rural areas or near interference sources. Smartphone and 50 ohm receivers: Use with malachite or standard 50 ohm input devices and smartphones to broaden listening options for aviationband and shortwave signals without needing specialized receivers.