Even in an economic downturn Americans can't do without the tube, and that's good news for Radio Shack. Radio Shack (nyse: ) posted better-than-expected quarterly earnings to top several weak quarters, thanks to the recent rush for analog-to-digital converter boxes for televisions. TV broadcasts are set to segue to an all-digital signal in the first quarter of 2009, which is forcing consumers to buy converter boxes for their televisions, or even buy new sets. Shares in Radio Shack soared 16.3%, or $2.28, to $16.30, in early afternoon trading on Thursday in New York. Pre-paid wireless phones, GPS systems, video gaming accessories, and a boost in post-paid AT&T (nyse: ) sales (likely due to people converting to Apple's (nasdaq: ) iPhone and its sole U.S. carrier) also gave Radio Shack some extra padding to its top-line. Radio...
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