What is generally considered an improper practice when using a radio?

Talking too close to the microphone is generally considered an improper practice when using a radio for several reasons. When a speaker is too close to the microphone, it can result in distortion of the audio signal, making it difficult for the receiver to hear and understand the message clearly. Additionally, this can create excessive noise from plosive sounds (like "p" and "b"), which can further impair communication.

Ensuring clear communication is critical in emergency situations, where accurate information must be transmitted quickly and efficiently. Using proper microphone technique enhances the clarity of the message and reduces the likelihood of misunderstandings. In contrast, choosing the correct frequency, reducing background noise, and keying the mic before speaking are all considered proper practices that promote effective radio communication.