Which frequency bands are designated for aeronautical use?

The correct answer identifies the frequency bands specifically allocated for aeronautical communications, which are essential for ensuring the safety and efficiency of aircraft operations. The 108-137 MHz band is primarily used for VHF communication with aircraft, including various aviation communication facilities such as Air Traffic Control (ATC) and flight services. This range also accommodates VOR (VHF Omnidirectional Range) navigation signals.

Additionally, the 225-400 MHz band is designated for military aviation communications, supporting tactical communications among military aircraft and facilitating secure communications necessary for defense operations. These bands are harmonized internationally by aviation regulatory authorities, ensuring that air traffic can be managed effectively across different regions.

The other options provided include frequency ranges that are not specifically designated for aeronautical use, which can lead to confusion about which bands are applicable for aviation communications and navigation. Understanding the specific frequency allocations helps enhance aviation safety and operational capabilities.