Thank you for your reply. Sorry but I'm a real ignoramus on these things but can I ask: When you say it can be a satellite-type screw-on connector, I presume that doesn't mean that if I use that method I'll be able to get more channels through a satellite connection?
The question comes up a lot. Don't worry. You aren't the first to ask and you certainly won't be the last.
The signal from a satellite dish LNB isn't compatible with the aerial input on a TV. This isnt a question of changing the shape of the plug at the end of a bIt of cable. The reason they're not compatible is the signal itself.
Some TVs have both a Freeview and a Freesat tuner. On the TVs you'll find two sockets; one will be the normal 'TV ANT' / 'RF IN' socket like your current TV. The other, the one to feed signal to the satellite tuner, that will have a screw-on type F connector.
We've been using the push-in TV aerial plug for decades upon decades in the UK. There's no sign of that changing. The same plug and socket arrangement has been used on aerial distribution amps and other aerial connections such as splitters, but that is an area where the trend is changing.
It's common now to find distribution gear, splitters, power supplies etc using the screw-on F plug and socket system. This includes some aerials. It's still an aerial signal flowing through (not a satellite LNB signal), it's just a different style of connection.
Regarding your channel reception, if your Freeview signal comes from a relay transmitter where the service is known as Freeview Lite, then you will have fewer channels than the full Freeview service coming off the main transmitters.
In a situation like that, it might be useful to look at a Sky styles satellite dish and a Freesat receiver. They don't have this restriction.