Ummmm. I had a freeview box, loft aerial and booster from Argos. Worked perfectly. I know a great aerial man if you want one. Lives near Kettering so not too far.
All these answers are correct assuming you already have the box but if you don't it may be better to get Freesat and a dish . There are no problems of obstructions blocking the reception. There are no ugly aerials stuck up on the roof . The dish can be very low down near ground level . Y