Dunno, it's your kit not mine ;-)

According to the website you linked to, "[it] is a standalone, plug-and-play TV box which allows you to watch the terrestrial TV programmes on the LCD monitor". This is backed up by the diagram, which has an antenna input: these don't just magically work by themselves, there has to be some sort of tuning interface somewhere along the line. Indeed, addedentry must have interacted with it somehow if he's successfully brought up the VCR via a coax cable.