NooElec Balun One Nine - Tiny Low-Cost 1:9 HF Antenna Balun with Antenna Input Protection for Ham It Up, SDR and Many Other Applications! 1:9 HF antenna balun for long wire antennas; includes excellent ESD protection on input. Great match for attaching a long wire to the Ham It Up. Fully assembled, and easy to use. Excellent specifications & low insertion loss. Only 39.2mm x 13.0mm and 5g!