Right, the card is installed but not tuning yet. I think I might need an extra signal booster or perhaps a higher gain ariel.
The drivers took a bit of sorting out, as Fedora Core 3 doesn't automatically create the DVB devices.
The only problem so far was a conflict with the nVidia drivers which caused the display to hang. To solve this I swapped the card for an ATI Radeon 7000 from another box.