You could probably do it with as small as a 6' dish but I would go bigger if you have the room, 10' being a very good choice. With that dish of course you will need a feedhorn and C-band LNB or a LNBF which has both the LNB and feedhorn all in one. An actuator is necessary to move the dish to all the different satellites, likely if you find a good used dish it will already have one. Look around on craigslist, kijiji or any other free internet ad site. You will find that a lot of folks will just give them to you if you are willing to disassemble and remove them from the property. There is lots of good advise on this site about finding a dish!