As with most things that our bodies evolved, or didn't evolve, there's a good reason why we didn't get this one, if you look at radio waves, you would be talking about seeing all the static that your television shows when it's anntenae is on a blank channel, that's the cosmic background microwave radiation that is left over from the BigBang.
From closer, more real sources you have the sun, but i'm not sure how much radio frequency we get through the atmosphere, and the magnetosphere.
It would be interesting if we could see pulsars that lay inside our own galaxy, which are neutron stars spinning so that they emmit pulsing radiowaves based off their magnetic axis. Although it might be quiet annoying as well, constant piffs of brightness in your vision would make you go mad i would think.