Woah!!!! That kind of reply from Sophie is one which I would find highly insulting as a member of the forum, and even more so if I were a new member.
Whilst I uderstand that the same questions are asked time and time again, and the more long term users have the answers, we all have to start somewhere and helpful replies are all that are needed.
Yes there is a lot previously written, but the search system is not good, not easy to use and if you do not pick the part of the forum where they are posted you get no results.
In direct reply to John, yes the Maplin and Lidl systems are good value for money and relatively easy to use, once you master finding the satellite!!!
There is a very good work through at the web site satelliteforcaravans, and I also believe that there is a good one somewhere in the forum, but I cannot find it off hand.