TV/BT Vision problem

Hi guys, I have recently had delivered a BT Vision box but have a slight problem. I have no aerial cable coming into my house as I don't think it is connected to the socket. For my old Sky box I just used to use the screw intype cable that comes through my wall.

Is there any way to get my BT box connected? or do I have to get the aerial fitted and connected properly? I was thinking that I could run the signal into the Sky box and then out into the Bt box but this does not seem to work.

Any help would be great, cheers