Wazza,
I've moved your thread to 'networking' as it's what you are wanting to do... share a network.
Ethernet over power should work, providing both ends are connected to the same power phase.
If that's not possible, a wireless link is a solution.
Even a wireless router which has provision for an external antenna and wireless modem with external antenna at the other end may work fine, depending on the distance between the two buildings.
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