Stock Boy

Actually, I should say it works intermittenly. I will turn on the radio, and all I hear is static. After 10-15 minutes, the radio signal will start to come in. If I turn to the CD player, and turn back to the radio, it's static again. I don't know if its the radio, the antenna, or something other than. This has been happening for the past few weeks. And it happens more often when it's warm outside. Anyone experience this? CD player works fine.