The Outdoor Balun/Matching Transformer (CM94444) is used to convert the 300 ohm antenna output to 75 ohms so that low loss coaxial cable can be used to transport the TV signals from the antenna to the TV set. It is called a matching transformer because it matches the 300 ohm antenna output to the 75 ohm coaxial cable. Balun = Balanced/Unbalanced.
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