Tvheadend

I have read a few reports that seem to suggest that TVHeadend supports the ability to use a single unicable coax with more than one satellite tuner card.

Is this indeed true and, if so, what equipment would I need?

I want to connect three tv tuner cards (two single and one dual, to give a total of four) to a quad-unicable LNB.

I assume that I would need a four-way unicable splitter at the other end of the coax, or is it more complex than that (if indeed it is possible)?

Thanks.