Very weak signal from N600 Router

I have a Netgear N600 Wireless Dual Band Gigabit router. Lately I have been getting a very weak signal, one or two bars out of five. I've tried turning it off and on, I used a paperclip to poke the Restore Factory Settings function, I've tried disassembling and reassembling the router and my modem, and I've tried new cords from the router to the modem. I have been unable to restore my signal strength to the five bars I used to have.

Any other suggestions?