The 75 ohm F-type connector (also F-connector) is a coaxial RF connector. It is commonly used for “over-the-air” terrestrial TV, and cable TV. and commonly used for satellite TV and cable modems. Usually used with RG-6/U cable or with RG-59/U cable.
The F connector is an inexpensive, gendered, threaded, compression connector for radio frequency signals. It has a good 75 Ω impedance match for frequencies well over 1 GHz and has usable bandwidth up to several GHz.