An antenna in volleyball is a thin rod attached to each side of the net. It marks the legal crossing space for the ball. The ball must pass between the two antennas. If the ball crosses outside them, the play becomes illegal. Therefore, antennas help referees make clear decisions.
They also guide hitters and setters during fast plays. Antennas extend above the net and stay visible. Players quickly learn to respect their position. However, beginners often forget about them. This leads to simple errors. For example, a setter sends the ball too wide. The ball crosses outside the antenna. The referee immediately stops play. The opposing team wins the point.
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