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Ldg Rba-4:1 Electronics Balun: 4:1, Voltage, 200W4:1 Voltage Balun (Assembled), 200W The RBA- 4:1 Balun was designed to allow easy interface of ladder line antennas and long wires to the LDG line of Automatic Antenna Tuners. The Balun operates "stand alone", thus does not require an LDG Tuner. It may be used with any of your long, random, or ladd..