Howard Stern Jumps to Satellite Radio  NEW YORK (Reuters) - Howard Stern, the ribald radio host  who has become a poster boy for bad behavior on U.S. airwaves,  will jump to Sirius Satellite Radio &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=SIRI.O target=/stocks/quickinfo/fullquote"&gt;SIRI.O&lt;/A&gt; in January 2006,  freeing him from the grips of regulators and giving the nascent  satellite radio sector a big boost.