🔍 Key Concepts

• VHF radiotelephone installations on passenger vessels • Antenna characteristics needed for short-range marine communication over seawater • Difference between routine design requirements and special/emergency or testing/logging requirements

💭 Think About

• Which option actually describes how the antenna itself must be designed and oriented to work best over seawater? • Do any of the options sound more like emergency or procedural requirements rather than basic antenna design requirements? • For VHF marine radios, what kind of polarization and radiation pattern is normally required so all nearby vessels and shore stations can communicate reliably?

✅ Before You Answer

• Identify which choice focuses on the physical and electrical properties of the antenna (polarization, directionality, efficiency) rather than distances, emergencies, or logging. • Ask whether marine VHF radiotelephones normally require vertical or horizontal polarization for ship-to-ship and ship-to-shore communications. • Check if any answer mentions a very specific emergency channel (156.800 MHz / Channel 16) and consider whether that sounds like a standard antenna design rule or a special/emergency requirement.