Here’s What the Shark Fin On Cars Is For

Over my 50-plus years in the automotive repair industry and as an ASE and General Motors Master Technician and vocational instructor, I have witnessed thousands of new technologies introduced in the cars and trucks we drive, from something as simple as electronic ignition replacing distributor points and condensers to self-driving cars. Many concepts that were pure science fiction while I was growing up in the ’60s have become ingrained in our cars and everyday lives. A lot of these newest technologiesfrom the Internet, Global Positioning System (GPS), telematics and other sophisticated systems in our vehiclesrely on radio signals or waves (a type of electromagnetic radiation best used in communications) that are captured by your vehicle to function properly.

The shark fin devices on the roof of our vehicles respect the “form follows function” principle, which, according to The Architect’s Diary, “asserts that the shape, structure, and appearance of an object should inherently derive from its intended use or function.” Read along to learn what that shark fin shaped on cars is and what it does.

What Is the Shark Fin on Top of My Car?

The shark fin that sits on top of your car is an antenna. It sits on the roof, facing the open sky, to receive better, cleaner digital and analog electrical radio signalsfrom either a satellite, your key fob or devices in your car “talking to each other.” It then converts the radio waves into usable signals and delivers them through coax or optical fiber cables to the various devices in our vehicles. The devices then convert the signals from the shark fin on your car back into usable, high-quality audio and visuals and consistent high-speed data transmission between devices.

Why Is the Antenna Shaped Like a Shark Fin?

Besides improved aesthetics (you have to admit the advanced-designed shark fin on your car does look good), the aerodynamic, streamlined shape of the “shark fin” decreases wind resistance and lowers wind noise. The wide footing allows it to house up to 14 antennas to capture or transmit multiple radio waves simultaneously for different functions, including cellular data, Bluetooth signals, accident alerts and even the Advanced Driver Assistance (ADAS) Systems.

While boosting a vehicle’s appearance over the old style whip, power and more recent, stubby and flexible rubber duck antennas, its low profile design is more durable and less likely to be damaged if you go through a car wash, from low hanging tree branches or vandalism.

Can I Install A Shark Fin Antenna On My Car?

Depending on your car’s make, model and year, yes, there are shark fin antennas that you can install to replace stubby and rubber duck-style antennas. However, if you’re unfamiliar with automotive installations, consider consulting a professional to ensure proper installation and performance.

Sources

• The Architect’s Diary: Form Follows Function: 10 Ways To Implement in Modern Design (2023)
• Abracon: Top 3 Reasons to Use Shark Fin Antennas (2021)

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