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Technically it probably is possible, but the kit to do it on a one off basis would run into thousands. The tuners in a satellite box are designed to work with higher frequencies than is used on terrestrial TV. In any case such a converter would need to connect the the lnb inputs. The rf input on a Sky box is merely used to pass on Freeview signals to the rf1 and rf2 outputs plus a single PAL analogue channel that allows remote viewing of the Sky box plus Freeview on a remote TV using a single coax cable, created internally in the box.