25:1 to 81:1 Baluns/Ununs These baluns and ununs can be used for impedance matching and also as End Fed halfwave antenna matching transformers to 50 or 75 ohm coax cable. Mix 75 Store/Ferrite Core Products/Mix 75Ring - Mix 75 RFI Range: 150 Khz-10 MHzRing - Mix 75 RFI Range: 150 Khz-10 MHzSnap On - Mix 75 - RFI Range 150 KHz-10 MHzSnap On - Mix 75 - RFI Range 150 KHz-10 MHzSlip On - Mix 75 - RFI Range 150 KHz-10 MHzSlip On - Mix 75 - RFI Range 150 KHz-10 MHz