🔍 Key Concepts

• Modern marine RADAR scanner designs on commercial ships • Differences between dish (parabolic) antennas and bar-type (open array) antennas • Why slotted waveguide arrays became common on ship bridges

💭 Think About

• Picture the RADAR unit you most often see on photos of ship bridges—does it usually look like a dish or like a long horizontal bar? • Which of these antenna types is best suited for creating a narrow horizontal beam while staying low-profile and rugged in a saltwater environment? • Which option matches the "open array" scanners commonly mounted on masts and wheelhouse tops of commercial vessels?

✅ Before You Answer

• Identify which answer choice corresponds to the long, bar-shaped scanner commonly seen on merchant ships • Eliminate antenna types that are more typical of satellite dishes or shore-based communications towers than ship RADAR • Confirm which type is specifically known as a bar or open-array marine RADAR antenna in training materials and equipment catalogs