Dead On Arrival.
Anything that does not work from new may have been delivered in that state.
If you have set it up according to the instructions, tried to tune it in and got nothing, yet another device works fine on the same aerial connection - socket and cable - you need to contact the supplier and report the issue, with a view to getting talked through some diagnostic steps, and getting a replacement item if these steps do not resolve the issue.
Who was your supplier? Situations like this are where bricks-and-mortar stores have the edge over pure internet suppliers.
YouView Superuser, but not an employee of YouView, nor retained by them for this purpose. It's purely me speaking
