Hi DS, you can forget it with an inside aerial, you're just boosting a noisy signal. Pop outside and have a look at the aerials on the roofs, check which way they're pointing, and if you can get the same direction out of a window use the indoor aerial outside the window. The other option is to pop into a tv shop and buy a 10 element or 14 element aerial for your area and a cranked arm. Screw this to your window frame and connect up, you'll get three to four times the signal than the set top.
Look up aerial fitters on google for your area and you should get a supplier for the aerials.