That's known as a satellite feed, it's not an aerial.
To use your monitor/TV (LG Flatrons are really PC monitors with a TV tuner) you either need to get an aerial fitted or buy a Freesat box which you can connect the satellite downleads to.
In Manchester, you might (I repeat - might) get a good signal from the transmitter on Winter Hill. If that is the case then, though it is not normally recommended, you may get sufficient signal with some kind of indoor aerial, preferably one that, at least, looks similar to those you see on roofs.
A satellite dish will not provide any service for Freeview (only Freesat) so that idea can be disregarded,