Just to add to this, if you already have an analog TV aerial, that should work. My 15 year old analog TV aerial works fine. The reason I mention this, is that some info on the web & "some" installers recommend a new aerial or digital aerial to hype up the cost!
Nope, this is untrue im afraid - some locations "do" require a digital ariel, and a lot of locations will require a digital ariel to recieve all the multiplexes perfectly.
A digital ariel is designed to recieve a muh wider range of frequencies than a standard analog ariel, with a standard ariel, they are really only designed for recieving channels that are very close together within the UHF spectrum, whereas the DVB channels are located on a different part (400 - 900Mhz) of the spectrum, and each multiplex is grouped further apart. You may also find that a sandard ariel recieves 16 QAM multiplexes perfectly, but struggles with 64 QAM multiplexes and even vice versa, due to the quality of the ariel.
In area's with a strong signal reception, you won't need to upgrade because even an indoor areil will suffice, but where the signal may well be weaker, it is strongly recommended to change to a digital ariel.
If you want to try an indoor solution mate, the very best (fact, proven by the DTG) indoor ariel available is http://www.amazon.co.uk/digiTop-Amplifie...1996&sr=1-1
- it will recieve all digital channels.
With regards the TV itself, once an ariel is connected, you will usually find the Freeview installation menu located on the TV setup menu.
If an outdoor ariel is needed and get stupid quotes which you don't want to pay, you may wish to look into Sky's "Pay Once Watch Forever" package - for a £75 one time feee, you get a free digibox with installation, and then 4 months of Sky TV channels, after which, you are under no obligation to subscribe. Thanks to the bandwidth constraints of Freeview, Sky offers higher bitrate (and therefore quality) basic channels than Freeview, and also a much bigger FTA and FTV choice.
And no, im not a digital TV installer, and I know it's a con the fact that some people need to upgrade their ariels to get the full range of digital television channels, but don't blame me, it's the government who are forcing us into it, and not offering us any financial assistance when they will be coining in billions upon billions when they come to sell off the analog spectrum to mobile phone companies and the like...
If you have an ariel on your roof, try it, see what happens, it may well recieve everything without having to upgrade. Even if it doesnt, it may simply recieve all the multiplexes that you need it to (ie. the channels you like).