Question 3-65J1

A vertical 1/4 wave antenna, by virtue of its physical orientation and symmetry, exhibits an omnidirectional radiation pattern in the horizontal plane. This means it transmits and, by the principle of reciprocity, receives signals equally well from all compass directions (0-360 degrees horizontally). This characteristic makes it a common choice for mobile or base stations needing to communicate with stations in any direction. Option A is incorrect because the operating frequency band of a 1/4 wave antenna is determined by its specific physical length, not by the antenna type itself. Options B and C are incorrect because they describe directional reception, which is characteristic of antennas designed to focus energy in a specific direction, not an omnidirectional vertical antenna.