[snip... regarding a Mac Mini that's missing hitting
an access point by "that much"]
If both houses are fed by the same transformer,
a poweline adapter set might be a good option.
For some reason there's a heavy amount of resistance
to using them, but they do often work.
Another suggestion that you did mention was using
an external WiFi unit. THat is, in fact, what
I was doing in a similar situation. I have a
Hawking, something or another, about the size
of two cigarettes wrapped together, that plugs
into a USB port on my Mac. I then have a 15 foot
USB cable which lets me stick the Hawking over
by my window.
So yes, those can succeed. But... you won't really
know until you try it.
--
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Knowledge may be power, but communications is the key
[to foil spammers, my address has been double rot-13 encoded]