Getting a signal a few blocks away is not going to be easy, and the Tin Can approach likely won't get near that distance
When it comes to wireless, you have a few options to increase your range. You can get an extender for the base, an extender for your laptop, or put stations in between the base and the extender to amplify the signal. To see some of the products we carry, you can go to the link below.
http://powerbookmedic.com/xcart1/custom ... 408&page=1