Which type of signal is used to transmit video and audio from an ENG truck to the TV station?

• A. Optical fiber
• B. Coaxial cable
• C. Hertzian wave
• D. Microwave

Answer: (D)

Microwave signals are used for this purpose. In on‑location news work, an ENG truck relies on a line‑of‑sight wireless link to send video and audio back to the station quickly. The truck and the studio (or a relay tower) both have dish antennas that broadcast and receive high‑frequency radio waves, which carry the live video and audio with low latency and without needing a physical cable run.

Optical fiber would require a fixed fiber path from the location back to the station, which isn’t practical for portable, on‑location work. Coaxial cable would need a long, heavy cable laid from the truck to the station, making mobility difficult. Hertzian wave is an old term for radio waves in general and doesn’t specify the high‑bandwidth, line‑of‑sight link that takes video and audio from an ENG truck reliably. So the wireless microwave link is the best fit for this scenario.