We’ve all see those tall antennas on top of cop cars or on older cars. But i never understood how it worked or whats in them. Are they literally just a long flexible wire? Does the signal emit from the top or throughout the length of the wire?
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The length of an antenna element is usually 1/2 of the wavelength of the signal it’s transmitting or receiving. Wavelength is the speed of light divided by the frequency of the radio wave in cycles per second.
The reason for 1/2 wave length is that it makes one end of the antenna element have the maximum voltage difference from the other end. The most physically interesting antennas in my opinion are Yagi antennas, which look like fish skeletons. I’ve made a few. They’re fun to design.
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