From Tim Cuprisin -- HD radios can cost about $200. One upside is that, unlike satellite radio, there's no monthly subscription fee. Right now, eight Milwaukee FM stations broadcast alternative programming, mostly music, in addition to a digital signal of their traditional analog broadcast: WUWM-FM (89.7) - broadcasts a music format similar to "World Cafe."
You can get details at http://www/wuvm.com.hd2 or read more at Milwaukee Journal Sentinel http://www.jsonline.com/story/index.aspx?id=645027