Well, sorry to put you through this,But I am not a very tech savy person.
If i understood correctly, did you mean that If i take a sky subscription and have a sky digi box installed. I can view channels by plugging the aerial in my TV tuner card. Please let me know what is an RF?? ( that might make me sound like an absolute dud in the tech savy forum).
Also i checked up my tv tuner card is Hauppage WIN TV -Digi terrestrial TV . Does that mean that I can only view Freeview channels?