I posted a guide on an earlier thread, there are other methods but this seems to work for most people that have tried it.
I pm'd a moderator to have this made in to a sticky but it hasn't been yet.
Wanted: Idiots guide to DVB-T, HD, DVBviewer, CoreAVC, BDA drivers etc,etc...
Update: Stable playback seems to work well with the Nvidia 84.31 drivers, upgrading to the 90 series beta causes out of sync audio and video buffer overflows (visible in the DVBSource filter config panel).