Numerous different sat are needed because there simply isnt enough frequencies available at one slot for the number of channels wanting to broadcast. Every satellite slot uses the same frequency band (10770 - 12750 MHz) Roughly speaking this allows about 1500 standard definition channels to broadcastof any particular orbital slot.
Technically speaking you are breaking your contract with sky if you use a subscription card outside the UK.
It is possible to get what are known as card shares to watch Sky channels with somew receivers, BUT this is totally illegal, and you have to either purchase a subscription to a commercial sharer or bring an alternative subscription to an existing ring of friends.
To be honest you are better off buying the SKy subscription in the first place!
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