The February issue of Scientific American has a worthy pair of articles of interest to broadcasters, especially to those who don't want to admit to their chief engineers that they don't know this stuff already. The links which follow provide only a tease, so you either need to purchase rights or buy the magazine. The first is a short article by Mark Fischetti called Song Beams that does a particularly good job explaining the urban repeaters for Sirius and XM. The second is a more complete article by Michael Antonoff called Digital TV At Last? which, not surprisingly, is about the transition from analog to digital television broadcasting.
I've been reading (or trying to read) this magazine for 40 years and it's been a great education. But they sure have antediluvian ideas about DRM and linking. --Dennis