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Saw the story in the Inquirer, but followed the link to Independent Online in South Africa carrying this story: New broadband 'whispers' below the radar. Sounds very cool to me; although now I'll need another piece of hardware:
xMax, the latest innovation in broadband communications, is a very quiet radio system that uses radio channels already filled up with noisy pager or TV signals, said inventor Joe Bobier.Nobody's using all those FM frequencies anyway -- just the oldies stations that are going satellite anyway. Posted by Grayson at July 5, 2005 07:24 AM"xMax is trespassing radio frequencies, although trespassing is not the right word, because we're allowed to transmit a signal if it doesn't interfere with other, stronger signals," said Bobier.
The technology could interest a telecoms or Internet operator with no radio spectrum
What is unique about the system is that it can emit signals that are too weak to be picked up by normal antennas, but that can be "heard" by special aerials which know where to "listen", thus enabling dual usage of the same scarce radio spectrum.