[MovedGoalPosts]

You'll need an analogue bypass or terrestrial aerial, in addition to the STB output.

Connect up the STB to the VCR and TV with scart leads. Connect a coaxial between the STB, VCR and TV too (with terrestrial aerial into the STB if thats how you get the terrestrial signal).

Then you record or watch the STB output using the AV (scart), whilst viewing or alternately viewing the terrestrial by tuning to the normal RF frequency ch 1, 2, 3 etc.