Car Decorative Antenna
Car Decorative Antenna
What's the point of the little ball on the end of antennas?
What's the point of the little ball on the end of the antenna. I'm not talking about the little decorative things people use to find their cars in parking lot, I'm talking about the little balls that are quite often on the very end of an antenna. They're part of the actual antenna, but I'm not sure what purpose they serve.
No, it really does serve an electrical purpose.
It's called a "corona ball." The idea is to avoid having any sort of a sharp point or edge on the end of the antenna. A sharp point would produce more static as the car moves through the air.
...later:
A bit more explanation: The car builds up a static charge as it moves (from friction of tires against ground, among other things) and this charge is going to leave the Car One way or another. A sharp point or even edge encourages the charge to leave via that route. (This is a principle discovered by Benjamin Franklin.) And if the charge leaves the car via your antenna, the resulting static noise is coupled directly into your radio's tuner. You obviously don't want that. A sphere - no sharp edges - is the best way to discourage the charge from leaving through the antenna.
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