This handy plug provides an adapter from an F-connector to IEC male. In short, the plug that you put in the back of the antenna connection of the TV.
This plug is useful to order in combination with a coaxial cable with an F-Connector at both ends.
Because most outdoor antennas for DVB-T have an F-connector connection, connect one part of your cable directly to the cable, and screw this adapter plug on the other side of the cable, which can then be connected directly to your TV. We find it super useful!