I moved into a new home last year and it had two wireless networks. I recently changed my ISP and got a new modem/router. I thought that both of the network would disappear, and be replaced by the one network from my new router. However, one of the networks is still operating. I cannot find the router anywhere in the house. I know that the network is from my house, its name contains my address. It is unsecured and I would like to take the network down, but I can't do that because I cannot locate the router. How might I locate this router?