there are a couple of plug-ins in the repository that work with various tuner protocols
check out the Dreambox e2 and eyeTV plug-ins - they may be close to what you need
if your device uses DVB-T, pretty much everywhere but the US, then you'll probably have a lot more success than ATSC/QAM - I gave up after a week
startup times can be problematic but while I've
never seen the 18 minute issue with the half dozen or so streaming plug-ins I've written its been mention on a handful of occasions, so... I guess it must be real... anyways YMMV