🔍 Key Concepts

• Relationship between antenna length (aperture) and beam focusing • How directional antennas behave as their physical size increases • Difference between wide beam vs narrow beam coverage on the horizon

💭 Think About

• If you want to concentrate more energy in a specific direction on the horizon, would you use a longer or shorter antenna? Why? • Think about radar or VHF antennas on ships: what kind of antenna produces a sharper, more precise bearing to a target? • How does increasing the effective aperture (size) of any sensor or emitter—like a flashlight reflector or a camera lens—generally affect the width of its beam or field of view?

✅ Before You Answer

• Remember that antenna length is directly tied to directivity (how focused the beam is). • Visualize: for the same power, does a longer antenna spread energy over a larger angle, or squeeze it into a smaller angle? • Eliminate any choice that suggests no relationship between antenna length and horizontal beamwidth, unless you can justify it using antenna theory.