How can I boost my Freeview (BT Vision) reception? The apartment is new built.?

If you have a communal aerial system ,you plug your aerial into a socket in the wall and don't have your own outside aerial, and pay maintenance which includes a charge for the aerial maintenance then they should get an engineer to check your system out.You can buy signal boosters but if the aerial is bad or the wrong type it may be a waste of time .Check your lease to find out what you are paying for and what you can put up yourself .If you do employ an aerial engineer to check your system or to install your own make sure to use a company recommended or one that can give you verifiable recommendations.There are a lot of cowboys in the aerial game especially with the digital switch-over and shutting down of some transmitters means the aerial itself might need moving a few degrees but a cowboy will fit a new system when it is not needed.