last time i looked into this you need a motorised satellite and a decent motor (due to wind) and a decent stand (due to wind) but even then they are only rated to last up to 100mph and recently we had winds over that within the past few years up here in scotland anyway and peoples dishes were bent out shape or ripped the stand loose from the house, etc.
unless of course you have a huge back garden with lots and lots of space where you can stick a MASSIVE motorised dish into the ground and bolt it there.
anyway the dish and the motor and the stand would come to roughly £250 for a decent setup then another £50-150 to install it.
you may also want to upgrade the LNB to a better one or one with more outputs, again another few ££.
now you need to buy a sat box which can control the dish.
if you want a HD one and one which can record, this is where things start to get expensive. boxes costing £200-£500 each.
now again if you are wanting this for sports, then again a lot of the matches being shown on sky sports, espn or BT most likely wont be on the free european sat channels it will be another match, so if man utd vs man city is on sky sports, the game you will be able to get will be wigan vs sunderland, etc.
another thing to consider is, it wont be in english, sometimes it will be but most of the time it wont be.
to pay all that money for a dish, motor, stand, lnb, HD boxes and then an engineer to install it all, it would actually be cheaper to pay a sky subscription for 2 years. at least that way you can actually enjoy the top games and in ENGLISH.
if your tight about money there are illegal ways of being able to watch the top games in English for pennies or even for free, but those cannot be discussed here. imo this is the option you are wanting to look into. google "card sharing"