Depending on the car, it can help receive AM/FM radio, GPS, satellite, cellular, Wi-Fi, and other wireless signals. Its position on the roof also helps it receive stronger signals with fewer obstructions.
The compact design allows manufacturers to combine several antenna functions into one small housing. It is also more durable, aerodynamic, and less likely to be damaged than a traditional antenna.
If the shark fin becomes cracked or loose, it may affect radio reception, navigation, or other connected features. It can also allow water to enter through the mounting area, so damage should not be ignored.
