Radio antennas

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I sent my car for a car wash service today. Well, after paying, I drove my car straight home. Through out the journey back home, I was so pissed off because I had a problem listening to my favourite radio station. The signal was very bad. All that I could hear was the 'scratching' sounds. Then, I realized that my car radio antenna is "missing". :-) So stupid of me, never think of my radio antenna. After I pulled out the antenna only then I can listen to the radio again. I am not a technology man. How does a radio antenna can capture the radio signals/waves?