My science teacher used to say a lot of weird stuff, but I'm just making sure on this one.
No. Radio waves ARE light, and so they travel at the speed of light.
The speed of light $c$ that is always talked about as the "speed limit of the Universe" is the speed of light in vacuum. Light travels slower in a medium, and how much slower can be dependent on the wavelength of the light. So, in the right medium, radio waves could travel faster than optical waves, but I wouldn't call this "faster than light"; that would be very misleading...