1. Impedance Design—The Donut Loop Antenna is a narrowband resonant antenna with impedance, specifically designed for receiving medium and shortwave signals. It requires the impedance input connection of the Malachite receiver to achieve performance. 2. Wide Frequency Range: The blue SW (shortwave) antenna covers a frequency range of 4 MHz to 24 MHz, allowing you to tune into a variety of shortwave stations. The red AM (medium wave) antenna is designed for frequencies from 500 kHz to 2000 kHz, delivering mediumwave reception. 3. Compact and Lightweight: Weighing only 90 grams as a set (60 grams for a single antenna), this Donut Loop Antenna is compact and lightweight, making it easy to transport and install. The package dimensions are 15 cm in length, 10 cm in width, and 4 cm in height for convenient storage and transport. 4. Durable Material: Made from quality materials, this antenna set is built to last. Its robust construction ensures reliable performance and longterm durability.