Any
generic satellite receiver (taking its feed from a dish pointed at the group of satellites used by Sky) can receive all of the FTA ('free to air') channels, listed here:
http://en.wikipedia.o...channels_at_28%C2%B0E
A Sky box without a valid subscription acts as such a generic receiver. (Having the card in it means that it's also capable of decrypting any encrypted channels which Sky might choose to broadcast on an FTV ['free to view'] basis but there currently aren't many, if any, of those).
However a Freesat receiver doesn't function as a generic satellite receiver. It's a product which has been licensed by the BBC and ITV (who jointly own Freesat) to receive ONLY those programmes where the broadcaster has paid them for inclusion in their EPG ('electronic programme guide'). Sky News hasn't paid for inclusion, so they're excluded from the list of channels available.
Dave isn't available on any free satellite service. It's owners (including the BBC,who've got a 50% stake in UKTV) don't believe that it would make commercial sense.
Freeview is a completely separate (terrestrial-only) service, jointly owned by the BBC, ITV, BSkyB and the transmitter company.
Chris