I have an old Microsoft G router and another desktop at the opposite ends of my house. That machine can see the network, but the signal strength is too low for stable connection.
Besides switching to N router, what can be done to extend the range? Maybe some kind of directional antenna?
Edit: It's funny, but the solution was found in the comments to the blog post at the answer's link :) I re-evaluated the possibility of wiring the place, took out my foot-long drill bit, drilled two holes to the attic and one between floors, and now I'm happy with my 80-feet CAT6 ;)