Looking for an old movie about radio stations

A long time ago, he watched a movie. The story took place in a middle school campus. A boy who loved radio made a radio station in his room. He was both a radio technician and a radio director. Moreover, in the eyes of his parents, this boy was a child with communication difficulties. He received many letters from listeners every day, and he would reply to them on the radio at night. It involved a lot of content that adults thought was inappropriate, but the students loved the program. Everyone waited in front of the radio every night to listen to the program. They recorded the program and then made it into a tape for sale on campus. This challenged the school and the American society at that time (if the story happened in the United States, I can't remember clearly), so the school, the police, the Federal Intelligence Department, or some other department jointly besieged the radio station. The smart boy switched the radio station to the car. He ran and broadcasted while being chased by many cars. That night, the students gathered in the square to listen to the radio and celebrate. Of course, he was still caught in the end. At that time, I was reading the original English version, and I started reading it from the middle, so other than remembering the story, there were no other clues. I've asked many people, but no one has any impression of it. Only Little Sun has seen it before, and he can't remember. I really want to see this movie now. Friends who have seen this movie, please provide some clues. Thank you very much.