Registered: 8th Oct 2011
I am surprised at this question.The folk next door do not have wifi but when their daughter comes to stay we quite happily give her access to ours. About 6 metres separate the houses and she uses the wifi anywhere and everywhere including the garden.
You could use wifi powerline adaptors or maybe configure a second router as a repeater (assuming it has the settings available) or actually install a repeater. Whatever option you eventually go for i would highly recommend password protecting access.