Connect your outdoor or indoor rabbit ear type antenna to TV with coaxial type input. Use to connect older TVs with flat cable input to coaxial cable. Transforms signal impedance from 300 Ohms used in coaxial cable to 75 Ohms used in antennas. Superior design for effective blocking. Hermetically sealed molded PVC case assures weather resistance. Supplied with protective weather resistant removable boot. Overall length: 6"- 7"; Leads are 3-1/2" long; Stripped wire end is approximately 1" long; Transformer diameter is approximately 0.75" . Includes 3 matching transformers.