As has been said the existing TV aerial should be able to plug into the back of the STB, from the STB a connection can then be daisy chained to your Video and then to your TV. You then tune your TV to channel whatever to get your digital TV signals. You may need to retune your video if you find that uses exactly the same frequency as your STB for outputted signals.
This has advantage that you can then watch or record the terrestrial channels whilst using the STB, or vice versa
The best way for a good picture is to connect the STB to your TV via Scart leads if at all possible.
*edit BTW
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