2:1 Baluns/Ununs Snap On - Mix 43 - RFI Range 25-300 MHz Store/Ferrite Core Products/Mix 43/Snap On - Mix 43 - RFI Range 25-300 MHz 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).