Hee-hee!
I'm in the process of getting the routers out of their boxes and I like the idea of chasing up their specs on the net rather than trying to do so from their manuals. My conversational Spanish is good (sobresaliente) but it's easy to go wrong in the technical stuff, especially in unaccustomed subject areas.
The "over-the-mains" idea (like baby alarms) is attractive but I have 3-phase electricity with the house divided among the phases by zone so I may not be able to carry the signal to remote areas that way because the same phase probably won't be used there.
I could try for a super-range antenna which each guest could use on their laptop but I don't want the locals setting up their deckchairs in rows at the gate to take advantage of my generosity!