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When astronomers use optical telescopes to look at objects in the sky, they see the visible light those objects are emitting, (or reflecting, as in the case of the moon or terrestrial planets). When astronomers use radio telescopes to look at those objects, they see the radio waves those sources emit, and the objects take on a different look.
Visible light and radio waves are both examples of electromagnetic radiation: energy that travels and spreads out as it goes.
These are radio modifications for some of the Radio Shack scanners. These are currently modifications to unlock the 800 Mhz frequencies that were locked out from the ...