Leading you to an educated decision.
The TNC (threaded Neill-Concelman) connector is a threaded version of the BNC connector. The connector has a 50 impedance and operates best in the 0-11 GHz frequency spectrum. It has better performance than the BNC connector at microwave frequencies. Invented in the late 1950s and named after Paul Neill of Bell Labs and Carl Concelman of Amphenol, the TNC connector has been employed in a wide range of radio and wired applications.