I think it's awfully common these days for routers to double as signal repeaters. That's what you really need, IMHO: a wifi signal repeater is pretty cheap, very easy, and it works. Or it's supposed to anyway, I've never had reason to use one myself. Basically they amplify and retransmit signals and nothing more. It looks to the client connecting to the network as though it's connected to the same server as always, except the signal's being repeated.I've never seen a line of sight setup, but that makes perfect sense... WiFi is pretty limited by design so that it's possible for several to exist in the same area. Line of sight would allow you to beam a stronger signal without worrying about it fucking everybody else up because it radiates 365 degrees. So I guess it depends on how far you want to extend your network. Personally I'd try a signal repeater if the specs sounded right.