Features: This 40m-10m UNUNTENNA is portable&compact and it is suitable for backyard&portable SOTA. Integrated 9:1 voltage BALUN to match your unbalanced 50 ohm impedance input to a 450 ohm impedance unbalanced long line. Elecraft KX-2, KX-3, Icom IC-703 and manual Multi Z Tuner autotuners are tested with well operation. Best efficiency at 20M distance, S performance is lower at 40M and 10M For drive components, use non-resonant length wire, usually 41', 35.5' or 29', and optionally a 1/4 wire as the balancer, 35' length balancer for all frequency bands. It is designed to wrap the connected wires around the device to store it as a small&compact device. Offer all components except antenna wires and balanced wires. You may use your existing stuff and we recommend anything from 20awg to 26awg. Depending on your specific situation, you can use two holes to fix or suspend the device. Offer all stainless steel hardware for the antenna and balanced connections. There is a female BNC mounted on the board for connecting the tuner. Difficulty levels are 1 to 5&5 is the most difficult. Specifications: Product type: UNUNTENNA BALUN: 9:1 Gross weight: Approx 295g/10.4oz Interface board size: Approx 12 * 7.3 * 2.8cm/4.7 * 2.9 * 1.1inch Product size: Approx 14 * 6 * 3cm/5.5 * 2.4 * 1.2inch Package size: Approx 16 * 16 * 5cm/6.3 * 6.3 * 2inch Package list: 2 * Wire Rods 1 * Interface Board (9:1 BALUN) Note: This UNUNTENNA needs to use tuner!