if you wish to pick up off the Astra group of satellites [normal Sky] depending on your location you will need a dish approx 2.8 -3.5 mt diameter and a single [for one box] or dual [for 2 boxes] lnb and get the best you can afford as this is the most essential bit of the system.. the other thing to consider is sky fees i understand they can be quite expensive for a full package

see here for foot print and dish size [over toward Kazakhstan you will need a dish around 4 mt.. to rum multiple units [more than 2] you will be spending lots of dosh on multiple LN B's and cabling.. there are many site about satellite TV just have a goggle and read

wiz