In this excerpt, the author uses rhetorical questions in order to clarify his point and force the audience to think.
The author presents an opinion: he is against the idea of erecting a cell phone tower next to the high school. However, in order to persuade the audience, he asks them rhetorical questions. He is aware of the fact that the questions are going to push the audience to think, and that they are likely to agree with his point of view. Therefore, by presenting these rhetorical questions, the author contributes to the effectiveness of the argument.