Fresnel zone

A Fresnel zone is an imaginary area around two or more objects (like two radios) that are trying to communicate. Picture it as an invisible bubble that can move and change shape. The wider and more even the Fresnel zone is, the easier it is for the radios to communicate. The stronger the signals can travel between the radios and the better the sound quality is. The idea of a Fresnel zone helps explain why there can be interference or poor sound quality when radios are not placed far away from each other.