Concept explainers
Radio antennas are made so that the electromagnetic radio waves “fit” on the wires. Think of a radio antenna as the x axis of a sine or cosine graph, depending on the kind of antenna. The ribbon-like FM antenna that comes with the purchase of most stereo receivers is actually a “half-wave folded dipole antenna” so that its length is roughly one-half of the wavelength of a frequency in the middle of the FM band. Because all electromagnetic waves move at the speed of light (
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Elementary Technical Mathematics
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