...mmm...I reckon you will be like I was....tried lots of different indoor jobs to get Freeview and never had any luck at all...waste of time and money.
In the end I bought a decent LOFT arial and installed that in the loftspace just above my bedroom...Bingo...I got all the Freeview Channels and never a glitch so far...........
It was an 18-Element Wideband TV Aerial and cost �19.99 from Maplin Electronics.....I just slung it from one of the Roof rafters and ran a decent piece of co-ax down the wall...........
.....hope this helps....commoner.