ARRL Technician Practice Exam

What antenna polarization is typically used for long-distance weak-signal CW and SSB contacts on VHF and UHF?

1. Vertical

2. Horizontal

3. Diagonal

4. Circular

The correct answer is: Horizontal

The correct answer is horizontal polarization. This type of polarization is particularly advantageous for long-distance weak-signal communications, especially for modes like Continuous Wave (CW) and Single Sideband (SSB) on VHF and UHF bands. Horizontal polarization is preferred in these scenarios because it tends to reduce multipath interference and exploit lower elevation angles, which can enhance the signal's reach and improve overall communication quality. It is especially helpful when making contacts over long distances, where line-of-sight propagation can be interrupted by obstructions, thereby benefiting from a horizontal plane. In the context of the other polarization options, vertical polarization is common in certain applications, especially for local communications, but it may not be as effective over long distances in the same way horizontal polarization can be. Diagonal and circular polarizations are less commonly used for these specific types of weak-signal contacts, with diagonal polarization not fitting established practices for standard communications and circular polarization typically being more relevant in specific applications like satellite communications or specialized setups where the orientation of the receiver and transmitter may vary.