Satellite Radio Faces Many Obstacles
Now that satellite radio services <A HREF="http://www.xmradio.com">XM Radio</A> and <A HREF="http://www.siriusradio.com">Sirius Radio</A> have their "birds" in position, they are encountering a slew of unexpected roadblocks here on earth. Among the problems: loss of signal in tunnels and urban canyons, interference with wireless communications, and a lighting technology that emits strong radio waves close to the broadcasters' assigned bands.