Sorry to bust your bubble, but HD means High Definition [radio]. Your reciever is HD ready, which means that you can easily add an external interaface that will allow you to recieve the new broadcasts as they become available.
If you haven't heard of HD radio, it'* basically the same as sattelite radio (quality wise, being digital and all) but it'* broadcast like current radio, from towers.
The feature on your radio that allows you to recieve FM radio station info and display names and the such is called RDS, for Radio Data System. This allows current FM stations to broadcase to you not only music, but the station'* name, advertisements, song titles, whatever they want. It'* sorta neat, actually.
'95 SSEi, few electronic mods (and a stupid coupler)
HU (Sony MDX-CA680, European Ver; Sony 4x3-ways; 91, 93dB)
Yup, that'* ISU