ARRL Technician Practice Exam

What is a reason to use a properly mounted 5/8 wavelength antenna for VHF or UHF mobile service?

1. It is cheaper than other antennas

2. It offers a lower angle of radiation and more gain than a 1/4 wavelength antenna

3. It is easier to install

4. It consumes less power

The correct answer is: It offers a lower angle of radiation and more gain than a 1/4 wavelength antenna

Utilizing a properly mounted 5/8 wavelength antenna for VHF or UHF mobile service is advantageous because it offers a lower angle of radiation and greater gain compared to a 1/4 wavelength antenna. This design characteristic is particularly useful in mobile communications, where the ability to communicate effectively over distances is important. The lower angle of radiation means that the antenna can effectively send and receive signals over longer ranges, especially in the horizon direction. This is beneficial in reducing the impact of physical obstructions, such as buildings and trees, which can block signals closer to the ground. Furthermore, the increased gain of the 5/8 wavelength antenna allows for better signal strength and clearer communication, making it a more efficient choice for mobile operations in VHF and UHF bands. In contrast, options regarding cost, ease of installation, and power consumption do not specifically relate to the performance characteristics that make the 5/8 wavelength antenna a preferred choice in these applications. Its design is inherently intended for optimizing communication capabilities rather than focusing on the other factors.