i don't know if this request already was there, could not find it with the search function.
VLC supports DVB but it really lacks a good and simple to use TV interface. It needs a dialogue which can search for television channels and saves them to a channel list. And then there should be a menu entry called "Watch TV" which opens this channel list. Of course it should be posible to edit this channel list, too.
Take a look at Kaffeine. They do it very well
