How do i tunnel two routers together?

i bought recently a cisco N router thinking it would extend the range of my wifi in order to connect wirelessly to my mac mini. Problem is that it does connect but still not what i wanted. So i heard that if i use my old netgear rangemax G router to my cisco N router and connnect the netgear one to a power outlet near my mac mini so it would catch some wifi and help increase the range. I dont know if its true or not but if it is can anyone help?