A lot depends on the strength of the signal in your area as to whether you need just an aerial and a simple splitter, or if you need something with a bit more oomph - a splitter that is powered.
Signal strength isn't easy to answer. Sure, there are web sites and stuff that will tell you general signal strength in your area... but it is only general and not specific to your house. I was talking to someone yesterday who lives a short distance from one of Britain's biggest TV transmitters. The web sites say they should get a huge signal, but they don't. There's a building smack between them and the transmitter. Best bet without spending money is have a look at what your neighbours have. Go ask them if their reception is alright.
I take it you need a loft aerial because there's something in the rules for the new estate stopping you having an outdoor one? If not, then a roof aerial is always a better bet.
So, baring the above in mind, here's a quick rundown of possibly ways to sort what you need...
If you have a really strong signal in your area, and your aerial can point at the tiles rather than the brick walls in the loft space, then a loft aerial with an inductive splitter may well work okay. You can get these splitters that will feed up to 4 TVs no problem.
If the signal strength is a bit marginal then an outdoor aerial, possibly with a mast head amplifier (this one is powered) will work better for you. You can use an inductive splitter again as long as it has something called DC Pass (...most do).
For anyone considering a new aerial then I'd always recommend getting it supplied and fitted by a Pro. We have the gear to measure the signal strength and get the best results from whatever signal level you have in your area. You'll also avoid wasting time and money on buying stuff that isn't suitable.
Good luck