Unfortunately, wireless networks have a limited range. That means that you can use the wireless internet connection a little bit outside your home, like in your garden or in your neighbours house, but not beyond that.
Alternatively, if the place where you work has wireless, you can use it there! Many schools, colleges, workplaces and even restaurants and hotels which offer free or paid wireless internet for you to use. This is known as WiMax and the system you have at home is called WiFi...
A word of Caution: If you have a wireless internet connection at home, make sure it has a password. Because if it doesn't, anyone from outside can sit outside your house and misuse your internet connection.
~eNjoy~