It looks like nokiabot has his linear and square metres (or even meters) mixed up. Covering a linear distance of 300m may be a challenge with a single router, especially in a built-up area. But it is no problem with multiple routers, even on the same network. What is your topology? With the distances involved I am assuming a number of individual houses. If at least a third of them have WiFi routers, problem sorted. At least one router should always be withing your reach. Of course you would all need to share login passwords but you said you were a close-knit community, right?