TiVo Net Loss Widens; Subscribers Grow  SAN FRANCISCO (Reuters) - TiVo Inc.&lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=TIVO.O target=/stocks/quickinfo/fullquote"&gt;TIVO.O&lt;/A&gt;, maker of  digital television recorders, on Monday said its quarterly net  loss widened as it boosted spending to acquire customers, but  subscribers to its fee-based TV service rose sharply.