In the vehicle broadcast receiving system, AM and FM signals have different characteristics, but they can share the same Car Radio Antenna. This is due to the clever use of electromagnetic compatibility in antenna design-by optimizing the frequency response range of the Car Antenna, it can not only capture long-wave signals in AM band (526.5-1606.5kHz), but also receive short-wave signals in FM band (87.5-108MHz) efficiently. The experimental results show that when the antenna length is in the range of 36-37 cm or 18-19 cm, the signal receiving efficiency of both frequency bands can reach the peak, which is the core advantage of our FM AM Antenna. Signal reception is not "the longer the stronger" or "the shorter the better", but needs to accurately match the frequency band characteristics. OurCar Antenna adopts the golden ratio design, and has a multi-layer composite conductor structure, which can not only capture the AM signal in depth, but also ensure the high-fidelity Transmission of FM signal. In the complex electromagnetic environment, this walkie talkie antenna can still maintain a stable signal-to-noise ratio and present you with clear and noiseless broadcast content.