What is the function of the shark fin on the back of a car?

[MarianaRose]

Here is an introduction to the functions of the shark fin on a car: 1. The shark fin has a radio reception function, ensuring normal sound signal reception even at high speeds, allowing the driver to listen to the radio normally. 2. The shark fin is used to receive GPS signals. Many cars come with built-in navigation, and the shark fin's role is to receive GPS signals for the proper use of the navigation system. 3. The shark fin is used to receive GSM signals. The quality of phone calls in high-speed cars is closely related to the function of this shark fin. Including system upgrades and network services, all rely on this shark fin to enhance signal reception and transmission. 4. The shark fin has the function of discharging static electricity. In dry winters, the car's precision instruments need to release static electricity, and the shark fin helps discharge it, providing a protective effect. 5. Another function of the shark fin is to reduce drag and wind noise. The previous long antennas had significant wind resistance, but after replacing them with shark fins, both drag and wind noise are greatly reduced.

[RyanDella]

Last time I helped a friend modify his car, I did some research on shark fins. This thing isn't just for decoration. It's actually an integrated antenna, packing the old rod-shaped antenna into a fin design—both stylish and functional. The signal reception is 30% stronger than traditional antennas, significantly reducing static when listening to the radio while driving. At highway speeds, wind resistance is noticeably lower, and the rearview mirror doesn't shake as much. Here's a little secret: It also discharges static electricity, especially in dry seasons, so you won't get shocked when opening the door. Recently, I've noticed some luxury cars even embed GPS modules inside, with sharper and more fashionable designs. Though it may seem insignificant, it's the finishing touch in car body design.

[Beau]

The shark fin antenna on my SUV has saved me a lot of trouble. Once during a self-drive trip in the mountains, my friend's roof antenna kept snapping against tree branches, while my streamlined fin design had no such issues. It primarily solves three practical problems: collecting and releasing static electricity from the car body is a hidden feature - no more electric shocks when exiting the car in winter. Its aerodynamic design reduces vortex drag, lowering fuel consumption by about 0.5%. Most importantly, it integrates GPS, radio, and internet signal receivers, keeping the roof clean and sleek. Even new energy vehicles now adopt this design, which also helps dissipate heat for the onboard systems.

[McLena]

After repairing cars for ten years, I found the shark fin antenna's most practical feature is anti-theft. The old exposed antennas were easily stolen, but this integrated design leaves thieves with no way to tamper. Its actual function goes beyond signal reception - it significantly stabilizes airflow during long-distance driving. Especially for hatchbacks, without it the rear tends to generate turbulence. Some vehicles even use it for radio interference shielding to protect the onboard computer. Pay attention to the installation angle - improper alignment can affect signal reception quality.

[LeGage]

Last time at the auto show, I learned from the designer's explanation about shark fins that BMW first used them on the 7 Series. Now mainstream models are adopting them, with two core functions: first, optimizing aerodynamics by allowing smooth transition of roof airflow to the rear at high speeds; second, integrating communication modules, which are more durable with four fewer connection points than traditional antennas. A key detail is the deliberate arrangement of internal copper strips—vertical stripes enhance FM signals, while horizontal stripes strengthen AM bands. The new trend is incorporating solar panels to recharge the battery.