Ham Radio General Class Practice Test

How does the forward gain of a two-element quad antenna compare to the forward gain of a three-element Yagi antenna?

1. About 2/3 as much

2. About the same

3. About 1.5 times as much

4. About twice as much

The correct answer is: About the same

The forward gain of a two-element quad antenna is generally comparable to that of a three-element Yagi antenna, which explains why "about the same" is the correct choice. When comparing these two antenna designs, it's important to consider that both antennas are designed to be directional, with the Yagi typically having a slightly more complex design due to its additional element. However, the two-element quad's unique design, which includes a closed loop structure, can deliver performance characteristics that allow it to compete closely with the three-element Yagi in terms of forward gain. Both antennas can offer similar levels of gain, generally around 6 to 9 dBi depending on design specifics, height, and the frequency used, leading to the conclusion that their performance is about equivalent. In contrast, the other choices suggest significant differences in gain, which do not accurately reflect the actual performance of these antennas. The options indicating that the quad antenna has considerably less or significantly more gain than the Yagi misrepresent the nuanced performance and capabilities of these antenna types.