Wireless Sales Drive Up RadioShack Profit  NEW YORK (Reuters) - RadioShack Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=RSH.N target=/stocks/quickinfo/fullquote"&gt;RSH.N&lt;/A&gt;, the No. 3  U.S. electronics retailer, on Tuesday posted a 22 percent rise  in third-quarter profit due to strong wireless sales and cost  controls, but its shares slipped as it kept its 2004 earnings  outlook unchanged.