When you say it doesn't work Paul do you mean it is physically broken or you just can't get a picture ???
If it's just a matter of getting a picture you may find that a booster is needed, by that I mean the proper booster not the ones from the supermarket. h**p://www.gradeuk.co.uk/ is the place to look and they cost just over £20. I know this because I had the same trouble on my first m/home and buying the booster cured it. Be careful about which one you order as there are two different ones. Have a look at your aerial to see which colour writing it is, that's the only way to tell as far as I know.
If the aerial is damaged or you still just want to get rid of it it is fitted to the roof by 3 or 4 bolts going through into the living accommodation. Just undo the nuts and remove the washers and it should just pull up from the outside. Keep the nuts & bolts safe to fit the blanking plate you will need to buy to cover the hole. Good luck.
Harry
February 2011
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix caravans/motorhomes.