RTL-SDR supporting long-line antenna 9:1 impedance converter(BALUN). Connect with BNC connector.
Operating frequency: 100K-50MHz.Small size, easy to disassemble and assemble, suitable for outdoor setting and QRP use.
(Note: For long-term outdoor use, the upper and lower covers of the shell must be glued and sealed with silica gel)
Only the impedance converter does not include the wire of the long antenna. The wires can use various existing metal wires.