Well, I can't really advise on a direct wireless link seeing s though I've never had one, but ISDN is quite underrated. It's a heck of a lot better than traditional modems for pings. Drawbacks are the lack of bandwidth, although 128Kbps isn't bad. Also, it's not an always-on connection, so you'd have to find a good deal with an ISP (always-on, no phone charges and 128K supporting ones are tricky to come by, and usually have hefty monthly bills).