did you install power vcr11 that came with the card,
fire up the program and click on the system settings on the power vcr panel(it looks like a hammer and nail, just next to the led type icon that says TV).
in the panel that pops up click on channels, then auto-scan, this then should scan for any tv stations that can be picked up.
or if you bring up the power vcr panel and look on the right hand side, you will see a little arrow, click on this and a new panel should pop out to the right,if you click on the magnification glass icon, this should also scan for any available channels.
Ps it also works if you hook it up to your sky box, plug it into the second ariel out socket, then enable it in the sky box settings,works a treat