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MFJ Enterprises Original MFJ-913 Balun 4:1 Current 300 WattsThe MFJ-913 is a 300 Watt true current balunsantenna center insulators that transforms 200 ohms to 50 ohms Transmission Line Transformer construction using 100 ohm characteristic impedance transmission line gives flat 160-10 Meter response Large low permeability ferrite cores easily handle..