Bobier found a way to put one bit of data on one radio frequency cycle and recover that weak signal with a newly invented filter. If xMax uses a powerful carrier signal--which does require a dedicated, albeit very narrow radio band--it can even extend its range and capacity.
The first xMax network is currently being built in Miami and Fort Lauderdale where one base station can deliver broadband Internet over a 40 square mile area.
The capacity of that wireless network is not bigger than any other wireless technology, which means that more base stations need to be added if a certain number of people are using the network--typically several hundreds to a 1,000 users.
Sounds a lot like the DTMD technology that Bob Cringely turned me onto a few years back.