I live in a small town. A few weeks ago I got a new modem with built-in wireless router. My office is next to a popular bar and grill. As I was eating the other day, I noticed my office wi-fi signal is very strong in there. Before the new modem it didn't even reach there. Anyway, I would offer open wi-fi if it didn't pose an unreasonable security risk of to my office network. Advice?