Up, Down, Up, Down
It's been a roller coaster ride for satellite radio upstarts <A HREF="http://www.siriusradio.com">Sirius Radio</A> and <A HREF="http://www.xmradio.com">XM Radio</A> this past week as both companies fortunes shifted yet again. In a classic billion-dollar consumer electronics gamble, Sirius and XM are betting that they can reach critical mass by selling enough specially equiped digital radio receivers through car manufacturers while simultaneously signing up enough subscribers to reach profitability.