The other day, I noticed and cellular phone antenna which got me to thinking .
What with television and radio transmissions, cell phones and what have you, we must be awash in a sea of radio waves.
What would the world look like if our eyes worked, not in the visible region of the electromagnetic spectrum, but at lower frequencies, so we could “see” microwaves and RF? Would it look similar to what you would see at night, with numerous point sources providing illumination?
We would need very different eyes to those which we currently have (i.e. we would need a retina large enough and of suitable material to intercept the radio waves, plus a lens that was capable of focusing them etc).
That aside, and remembering that perception/vision happens largely in the brain rather than the eyes, I think we could speculate that it would look like the world was illuminated by numerous diffuse sources, furthermore, objects that we currently consider opaque might well appear transparent or translucent, other objects that we currently consider matt and non-reflective might look like a mirror, water would be black(I think).
Take a look here. The frequencies they are using are still way above what most folks would think of as radio, but its the closest thing currently available along the lines you are thinking.