Or if your just lazy like me your can either buy or rent another modem and pay more money. Or you can pick up a wireless network signal booster. Here is a link for some found on google shopping thingy. As for the 192.... if your running an airport (mac wireless router) you cannot use the number I have tired far to many times. Also the 192.... only allows you to change how much you what the device to be able to use and normally will not improve your signal. So here take a look---
Wireless network signal booster - Google Product Search