I live in a weak signal area and want to distribute my tv and radio signal from my loft to various room, the tv aerial is outside on a 10 mast attached to the chimney. Saw two units in Maplins today - one is a plug-in signal booster and the other is an aerial amplifier. Whats the difference between the two and which would be best for me? They're both the same price and the description on the packs seems to say pretty much the same things.