I need some advice regarding tv ariels and freeview...?

Much correct advice given in previous answers; the main point being that an indoor aerial will only work, if you are close enough to get a strong signal from a transmitter. A signal booster will not boost a weak signal received by an aerial; it's function is to compensate for signal loss in long cable connections. It is common practice for blocks of flats to have a communal system, fed from one multi-use antenna. Check the website below for professional advice.