2:1 Baluns/Ununs 50:112 ohm (2.25:1) Transformer Store/Antenna Products/CUBE Impedance Transformers (<1:1, 1:1, >1:1)/50:112 ohm (2.25:1) Transformer 2:1 (100:50) Baluns are useful between 50 ohm coax and 100 ohm balanced lines for loops, cubical quads, log periodics and other antennas where the impedance at the end of the feedline is 100 ohms (1/2 wavelength feedline).