How do you find beamwidth in qualitative terms?

Beamwidth in radar terminology refers to the angular width of the radar beam and is typically characterized by the points at which the power drops to a specific fraction of the peak power. Specifically, the correct choice indicates that beamwidth is determined by how far away from the center of the radar beam the power level is at 50% of the maximum. This is commonly defined as the half-power point or -3 dB point, and it provides a clear quantitative measure of the radar's directional sensitivity.

Understanding beamwidth is essential for analyzing how well a radar can resolve targets at different angles and distances. A narrow beamwidth implies that the radar has a higher resolution and can differentiate between closely spaced objects, whereas a wider beamwidth results in lower resolution.

The other options do not accurately describe beamwidth. The diameter of the antenna is related to the overall physical size but does not provide information about beamwidth alone. The total coverage area relates more to the range of the radar and does not involve the specific angular measurement that defines beamwidth. The angle of the antenna relative to the object does pertain to orientation but does not describe the beamwidth itself, which is more about the power distribution of the emitted signal rather than the antenna's positioning.