What type of antenna is used in the RSDS that is not capable of determining the angle of arrival?

In the context of antennas used in Radio Signal Directional Systems (RSDS), an omnidirectional antenna is specifically designed to radiate signal power equally in all directions within a specific horizontal plane. This characteristic makes it beneficial for applications requiring coverage over a wide area or for receiving signals from multiple directions without directionality.

Unlike directional or parabolic antennas, which focus their reception or transmission capabilities in a certain direction and can thus help determine the angle of arrival of signals, an omnidirectional antenna does not have the ability to localize signal direction. Its design inherently prevents it from differentiating where signals are coming from, as it equally responds to signals from all angles.

For applications where angle of arrival is crucial, directional antennas or parabolic antennas are preferred due to their focused radiation patterns. Adaptive antennas can adjust their pattern based on the detected signals, further enhancing directionality. Therefore, the omnidirectional antenna stands out as the option that lacks the capability to determine the angle of arrival in this context.