TV aerial plugs
There are 2 types of TV aerial plug, Belling Lee connectors and F connectors.
Belling Lee
Belling Lee connectors date from 1922, and have been popular for domestic TV use for many decades. However they cause significant distortion at satellite frequencies and can affect digital TV reception, so F connectors are now becoming more popular.
F
F connectors date from the 1950s, and have the advantage that they're not likely to fall out or pull out. They also use less material than the Belling Lee plug.