Antenna HDTV

  I have a pinnacle USB HDTV stick that gets good picture and sound by the
software that comes with it does not work well on an XP machine (crashes,
locks up etc.) and does not work at all on my new Vita Ultimate PC.  Vista
Media Center can tune this device but it is very limited.
Unfortunatley all the HD channels I want to watch and record are HD sub
channels.
Media Center on the Vista Ultimate does not work at all for this.
There are no subchannels listed and when I try to connect to them, some
connect (still no listings in the guide) and some will not connect.

So ...  the question is - what antenna HDTV device that has independent sw
that will run on the Vista Ultimate machine so I can have a guide (their
guide) that will show what is on the sub channels and will alow me to record
shows by series?
Please !!!

and Vista is supposed to be leading edge.  No way!