As a bit of history, last year I got a TV that I wanted to hook up to freeview.  At the same time I wanted to mount it to the wall (so it didn't fall over in the quakes) so I had someone come in and get it all mounted and fix up the antenna since I wasn't getting a digital signal despite having a UHF aerial on the house.  There was a splitter system in the roof that didn't appear to be working so rather than fix it up, the guy connected the socket in my room directly to the antenna, which worked and was fine since no one else in the house has a digital TV.

However, I've now moved rooms and obviously I'm not getting a digital signal in my room.  Rather than having someone come out and paying for them to look at it again, I thought I'd have a look first and see if there's anything I can do that makes use of the splitter system so should others in the house get a digital TV, they too can use it.  Here's some pics of what I found:

This would appear to be where the main antenna signal comes in and then splits it out.

Each of those outputs from the first pic goes into one of these boxes

I've never really dealt with antenna cabling before so I'm not sure if this is done right.  However, I remember at my parents their antenna system has a power adapter inside that plugs into one of the antenna sockets and I imagine, gives power to the splitter.  Am I missing one of those in this setup which is causing the TV to get no signal?