Features: The small rings antenna is a small size full frequency bands round circle magnetic field active receiving antenna, with a receiving frequency ranges 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. 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 Mobius loop can achieve twice the voltage gains of a regular small loop. The electric field shielding rings can effectively reduce the interference caused by the electric field in the surrounding environment, such as thunder and lighting, electrostatic discharge, etc. 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. Small loop antenna is suitable for almost all radios, SDRs, radio stations, and receivers with it will not disappoint you. Come and experiences. Specifications: Material: Aluminum Alloy+PCB Packaging Size: Approx. 15x15x5cm/5.90x5.90x1.96inch Receiving frequency ranges: 50kHz to 500MHz Gains: 17dB@10MHz Output noise: -125dBm (@ 10MHz, BW=100Hz) P1dB:+ 15.5dBm@10MHz OIP3:+ 38dBm@10MHz Power supply voltage: 9V to 12V Power supply current: 130mA to 150mA Antenna interface: SMA (M) Output interface: SMA (F) Small loop coaxial cable model: RG402 Small loop coaxial cable loss: 0.145dB/m Small loop antenna diameter: 60cm Note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution. Package includes: 1x Small Loop Antenna Amplifier Board 1x Headphone Hole Adapter Cable 1x Top Jumper Board 2x Small Round Circle Coil (Rg402 Coaxial Cable) 1x 7m Feeder Cable 1x 1m Feeder Cable 2x Adhesive Hook 1x EVA Storage Bag