A car antenna is a device used to receive radio frequency (RF) signals for various automotive systems, including AM/FM radio, GPS, Bluetooth, satellite radio, and cellular connectivity. Modern vehicles often use shark fin, whip, or embedded antennas (in glass) to combine multiple functions in a compact design. These antennas are engineered for strong signal reception, reduced interference, and aerodynamic integration, making them essential for infotainment, navigation, and communication systems in cars.