Mini Loop Antenna High Impedance Amplifier 300MHz Bandwidth Clearer Singals Enhances your radio reception with the 300MHz DonutAM MW/SW Mini Loop Antenna Replacement. The highimpedance amplifier is designed to convert high impedance into a standard 50ohm output, ensuring impedancematching and isolation. Suitable for various antenna likedonut whip antenna, and rod antenna, it greatly improves reception performances. for radio enthusiasts, broadcast professionals, and wireless communication enthusiasts, the high impedance amplifier is a must have accessory for any radio receiver, or walkietalkie. The high impedance amplifier provides reliable amplification for passive antenna reception. Perfect for use with donutantenna, rod antenna, and more. Experience clear audioand improved strength with the high impedance amplifier. your radio reception and enjoy a wide frequencies with this compact and durable aluminum alloy device. Specifications: Input : 1M Output: 50 0dB Bandwidth: 300MHz Charging 5V Internal battery capacity: 800mAH Charging current: 600mA Working hours: more than 24hours Size appprox 49x45x19mm/1.8x1.9x0.7in