If you're interested in radio broadcasting as a career, talk to  your high school guidance counselor.  You'll need to study communications and public speaking in college.  Try to find a local non-profit radio station where you can volunteer and get valuable experience.  Many colleges and schools have them.

If you're interested in radio engineering, you'll want to take a good college prep curriculum in high school, with a full load of math and sciences.  Some colleges well known for electrical engineering include MIT, Lehigh University and RPI. 

Many community colleges offer electronic technology courses which can lead to career as an electronic technician working in the cellular telephone, computer networking, or radio repair industries.

Additionally, the US Armed Forces and Coast Guard all make extensive use of radio and offer many jobs and training courses in using and maintaining radio equipment.