1. Features: The small rings antenna is a small size full frequency bands round circle magnetic field active receiving antenna, with a receiving frequency range of 50kHz to 500MHz. It mainly consists of a top jumper board, a small loop amplifier board, a small loop coil, a feeder, a feeder line, and a 12V linear power supply. 2. There are several sets of switches on the top jumper board and small loop amplifier board, and different structures of small loop antenna can be achieved by adjusting the position of the switches. Among them, the loop can achieve twice the gains of a regular small loop. 3. The electric field shielding rings can effectively reduce the impact caused by the electric field in the surrounding environment, such as lighting, electrostatic discharge, etc. 4. The structure of the unshielded rings is simple, and the small loop can be replaced by a thicker wire as a whole. The size modification is simple and easy to install. 5. Small loop antenna is suitable for almost all radios, SDRs, radio stations, and receivers with it may meet your expectations. Come and experience. 6. Specifications: Receiving frequency range: 50kHz to 500MHz; Gains: 17dB@10MHz; Output noise: -125dBm 10MHz, =100Hz); P1dB: + 15.5dBm@10MHz; OIP3: + 38dBm@10MHz; Power supply current: 130mA to 150mA; Small loop coaxial cable model: RG402; Small loop coaxial cable loss: 0.145dB/m; Small loop antenna diameter: 60cm. 7. Due to different batches, the appearance, color, and printed words of the product may be different, which does not affect the use. 8. Material: PCB+Metal; colour: As Shown. 9. Package Contents: 1 x Small Loop Antenna Amplifier Board; 1 x Headphone Hole Adapter Cable; 1 x Top Jumper Board; 2 x Small Round Circle Coil (Rg402 Coaxial Cable); 1 x 7m Feeder Cable; 1 x 1m Feeder Cable; 2 x Adhesive Hook; 1 x EVA Storage Bag. Only the above package content, other products are not included. 10. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.