ITEM NAME:4:1 Balun Converter HF Antenna for HAM Radio Balance-unbalanced Conversion Description: Radio magnetic balance adopts large-size high-quality for HAM radio equipment It can easily produce high-performance balun to ensure efficient radio transmission and reception. It allows you to fully enjoy the fun of DIY. 4:1 balun is suitable for long-line antennas, with manual day adjustment or automatic day adjustment. Features: Compact size , easy accessibility, suitable for outdoor use QRP stations and set up . Adapter: BNC Max Power: 0-50W Specification: Material: PCB Size:52x52mm/2.05x2.05inch Package Includes: 1 Piece 4:1Â Balun Note: Please allow slight dimension difference due to different manual measurement..It can easily produce high-performance balun to ensure efficient radio transmission and reception. It allows you to fully enjoy the fun of DIY. 1 Piece 4:1 Balun. Features: Compact size, easy accessibility, suitable for outdoor use QRP stations and set up.