Im trying to help my aunt out. She is a newbie user and this is her first mac. She just got the intel iMac. She keeps her wireless router in the basement. It is an older b router. Where she wants to keep her computer, she gets no wireless signal. In the next room, she gets a signal. What should she buy to increase the range or strength of the antenna? She has other computers running on the wireless. Will a g router solve her problems? Airport is to expensive, so i would get her like a netgear g router. What about an extender?