Tom Barry wrote: > Most people will not buy a portable radio that > requires a rotor antenna on a 30 foot mast. ;-) That's exactly right. Another way to put it is that radio RF has to be modulated to promote robustness, whereas TV RF has to be modulated to promote high quality in the smallest possible bandwidth. So digital radio operates at, say, no more than 1.3 b/s/Hz, whereas DTV is pushed up to 3.3 b/s/Hz. Even the detuned Euro DTV plants, i.e. 16-QAM, operate at 2.1 b/s/Hz. Fortunately, audio requires much less bandwidth than video, so no problem. The directional antenna (and possible rotor) are only there to compensate for the increased spectral efficiency. And by the way, radio is used in cars a lot. Creating dense SFNs for radio is not practical, because you'd soon lose your signal when traveling outside the SFN boundaries. Radio broadcasters can hardly afford to adopt a cell phone model (not that cell phone coverage is 100 percent anyway). Bert ---------------------------------------------------------------------- You can UNSUBSCRIBE from the OpenDTV list in two ways: - Using the UNSUBSCRIBE command in your user configuration settings at FreeLists.org - By sending a message to: opendtv-request@xxxxxxxxxxxxx with the word unsubscribe in the subject line.