If I'm reading this right, you have lost the channels on the TV now the hub is connected.
If so, you will need a separate aerial feed to the TV and to do this you will need an aerial splitter and 2 cables, one to the hub and one to the TV.
As you can't view both at the same time and the hub displays them it's not necessary but it does mean using the box all the time.
If you still wish to use your old YouView box, assuming this still works, in tandem, then this is also possible but again requires a separate aerial feed.
You can normally buy various splitters and cables from local supermarkets or on line stores.
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