F' Type connectors are used to connect coaxial cables to a multitude of other connectors, cables and items. They are secure and eletrically balanced . Most modern splitters, aerials and amplifiers use F' Type connections and there are a whole host of adaptors avaliable that can be used to turn your F Connector into any other connector. Female connectors have a thread on the outside, male connectors have the thread on the inside and they will screw onto the outside of the female connector.