You must talk to an expert rock-n-roll
Pick out a quality TV sales shop, go in and explain what you are trying to do...............then, they can help you put together a setup that will work in your area.
It is not something you should try to DIY, as there are some major pitfalls, and you could end-up-with-a-lot-of-expense-and-no-freeview
But..........make sure you pick a good shop; if they don't seem interested, keep on going until you find a shop this is.
You are paying them to help you.....so insist they carry their end.
Old Salt