Which of the following is a technique for overcoming terrain-related communications issues?

Moving uphill is a technique that can significantly enhance communication in terrain-related situations. When using radios or other communication devices in rugged landscapes, the topography can create substantial barriers that obstruct signal transmission. By ascending to a higher elevation, you typically improve line-of-sight to both the transmitter and receiver, allowing signals to travel more effectively and reducing the interference caused by hills, trees, or other obstacles.

In contrast, staying inside a building may restrict signal access and limit overall range, while lowering the radio power could exacerbate communication difficulties by weakening the signal strength. Using 10 codes may enhance clarity of communication, but it does not address the underlying issue of physical terrain interference. Thus, moving uphill is the best strategy for overcoming such obstacles in communication during search and rescue operations.