Haha; a reasonable Hub; and a few dozen TV Size High Power Antennia strategically placed with a good deal of lead to connect them. Either that or one dreadfully huge one.
You should ask at your local hardware store for their biggest Wireless Network Antennia; then ask for the range, and buy as many as would be required to fit into your system. From there; you'll need one PC controlling it with the Internet Connection; and a good piece of planning as to user accounts and such like.
A Knight is sworn to Honour. His heart knows only Virtue. His blade defends the helpless. His might upholds the Weak. His word speaks only truth. His wrath undoes the Wicked.