Hi,
I have a home made Satellite system. I put it together with bits and pieces from home (old tripod based fan became the base, with holes drilled in the feet for pegs to go through. Dishes / decoders are readily available from numerous sources on the internet.
If you intend to tour abroad, you will need a minimum of 50cm dish in order to recieve the Astra signal in France. If you go further south, you will need an even bigger dish. There are loads of websites out there that give very good practical advice. Provided you purchase a signal meter (fairly cheap on ebay etc) and can use a compass to check a heading, you should have no problems achieving a perfect signal everytime.
Hope this helps...
Vince.