Why the radio waves around us do not add up to random noise, from which it would be impossible to distinguish radio stations, Internet, television, etc.?
What radio station is playing if you lean the plug from the speaker to your body?
Can an amateur radio station pick up a government communications signal from a bomb shelter?
What is the function of a metal radio antenna? How does it affect the signal?
Explain in simple words what an analog signal is and how does it differ from a digital one?