What is the velocity of a radio wave traveling through free space?

Radio waves, visible light, microwaves, and X-rays are all part of the electromagnetic spectrum. Because they are the same fundamental phenomenon, they all travel at the same velocity in a vacuum or free space: the speed of light. The speed of light is a universal constant, approximately 300,000,000 meters per second. This means a radio signal travels from your antenna through free space at the exact same speed as a beam of sunlight traveling to Earth. A common misconception is that higher frequency waves travel faster than lower frequency waves. In reality, while frequency and wavelength change inversely, the overall forward speed of the wave through free space remains absolutely constant.