Steren 200-510 Quick Push-On Ohm Matching Transformer Balun 75-300 Ohm Off-Air TV Antenna Balum Coax Cable Female Signal Adapter
Quick Connect "F" Matching Transformer. Converts 300 ohm to 75 ohm. Use to convert the 300 ohm twin lead wire to a 75 ohm "F" type connector.
Instructions: