It looks like your house has had wiring for an RF Loop-through so that the Sky box picture could be piped to other TVs in the house.
Unplug the two aerial cables connecting at the white joiner/back-to-back. When you do this, the Freeview signal to the other TVs will disappear. Don't worry, it will come back when you follow my instructions.
Remove the joiner so both cables have the silver-looking aerial plug only. Connect one of the two in to your TV. Go to the TV tuning menu for Digital TV and try an auto tune. (read/download/search web for your TV manual if you need it).
If your TV picks up stations, then you've found the aerial feed. If not, try the other cable and repeat the tuning process. One of the two cables should give you a picture. Mark the cable that works (stick label / pen mark - whatever you need to do)
Reconnect the two cables with the joiner. Freeview returns to the other TVs in the house. Continue reading below
Depending on what you decide to do about a recorder in the lounge (I presume), then you'll either do whatever you need to do to keep the Sky box with its recording feature, or you'll buy a Freeview recorder and hook up the RF IN - RF OUT* connections and a HDMI for the local TV (see below for Humax RF tips), or you'll decide that you don't need a Freeview recorder at all, but you'll still want Freeview on the main telly as well as on the other TVs in the house. If this last one is the option you choose, then you'll need a 1-in:2-out RF splitter so that the TV and the aerial distribution box both get signal.
Get a metal-bodies splitter. They're cheap enough at under £2. Don't waste your time or ours with the plastic jobs. They're rubbish and will drive you mad because of interference. The metal ones are cheap and shielded. Simples
The splitter does what the standard Sky/Sky+/Sky+HD boxes with RF loop-through did. They give an aerial signal for the TV (RF1) and a second output to feed an aerial distribution box via the RF2 out. If you had Sky magic eyes, these are now redundant.
Labgear shielded two-way splitter from Screwfix @ £1.64
LINK
* Humax tips
Humax make decent and easy to use Freeview recorders. I would recommend the
HDR-1800T or the HDR-2000T. Of the two, the HDR-1800T is reputed to be more reliable. The other Humax Freeview box is the FVP-5000T. It's a lot more money, has a bigger hard drive, can make more simultaneous recordings, and has more SmartTV-type features, but they're a bit flakey. Personally, if I wanted to make a dumb TV smart, or update an old SmartTV, I'd buy an Amazon Firestick. For Internet streaming, they work beautifully.
Humax have a bit of a quirk about their RF loop-through though. It can be temperamental. Rather than using it, it's better to feed the Humax from a splitter. In your case, you would need a
3-way splitter (Humax, TV, loft box), and so if your longer-term plan is to add a Freeview recorder, then you might think about getting a 3-way splitter rather than a two-way. The only small wrinkle is the coax connections use the screw-on type F connectors for all of these. That's actually not a bad thing because it simplifies making up coax fly leads, but it is something you should be prepared for.
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