Symbolism, Imagery, Allegory
Radio Free Earth finishes the novel's education trinity. An offshoot of the Redeker Plan, Radio Free Earth is a broadcast beginning in South Africa and eventually spreading its message to the whole world. That message is simply education. As Barati Palshigar puts it:
Ignorance was the enemy. Lies and superstition, misinformation, disinformation. Sometimes, no information at all. Ignorance killed billions of people. Ignorance caused the Zombie War. (7.2.2)
Radio Free Earth symbolizes something really important: the potential formation of a true global culture. Just check out its name: not "Radio Free US," or "Radio Free Zimbabwe," but Radio Free Earth: for everyone.
This station dishes out information to the people and for the people. Its goal is to root out superstition, misinformation, and disinformation amongst individual citizens—bringing them together in the process.