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9-1 Antenna Matching Transformers Beverage antennas typically have from 450-600 ohm feed point impedances. Using a 9-1 transformer and either a 50 or 75 coax, you can efficiently match your receiving antenna for maximum performance. These handy transformers come in three different styles: either a BNC or F female connector or the isolated ground design with a BNC connector. To use them, you attach the red post to the antenna and black to ground. Then hook up your feedline. Units are potted for protection from the weather. Models available with BNC connector, F connector, and Isolated grounds

New and Improved Design Stainless steel hardware with Isolated Grounds (model SV-ATMS)

Based upon user feedback and suggestions from the very successful 5A operation, KD9SV has redesigned the 9-1 transformers to use stainless steel hardware, F connectors and isolated ground connections. These new units resist corrosion and will give you years of trouble free use. Can be used with either 50 or 75 ohm cable. Units are potted for protection from the weather.