Re:Bah! TANSTAAFL. (Score 2, Informative)

He's right. CDMA transmits below thermal noise, and it still needs to have its own band. Maybe if they're low power and short range, they can work and be unlicensed, but forget it for any kind of power. You may be able to get signal out of low power over range with directional antennae, but you can't punch through or bounce off material. No cell phones or radios certainly. Also, don't forget, the broader the band you take signal from, the wider and faster a A/D converter you need, and that can eat power.