xMax: Cheap wireless broadband?

A company called xGTM Technology has developed a new low frequency wireless networking protocol called xMax that can cover a wider area than either WiMax or Flash-OFDM (they claim a maximum range of 22km) and has a signal that's better at penetrating buildings. The best part is that it doesn't need a dedicated swath of spectrum to work, xMax transmits at powers that are low enough not to interfere with other signals, which means it can use radio channels that are already being used for other purposes. The first xMax wireless network is being built out in Miami and Fort Lauderdale right now, and they claim that one base station can deliver wireless broadband to up to a thousand users across a 40 square mile area.