Gain(dB): Barron's applicable HF shortwave antennas. 1:9 BALUN Micro Balun 1:1BALUN Micro Balun 3-30mhz 1 X1:1 Mini Balun. 1 X 1:9 Mini Balun. Frequency of use: HF. Interface type: M block. Features: Small size, easy disassembly and assembly, suitable for outdoor setting and QRP use.
eBay