ARRL Technician Practice Exam 2025 - Free Technician License Practice Questions and Study Guide

The frequency range of the HF (High Frequency) amateur radio band is correctly identified as ranging from 3 to 30 MHz. This range is significant for amateur radio operators as it encompasses several bands that are popular for long-distance communications, especially during periods of good ionospheric conditions. The HF bands facilitate communication over various distances, making them ideal for both local and international contacts.

The HF band is particularly well-suited for propagation characteristics influenced by the ionosphere, which can reflect radio waves back to Earth, enabling communications that can span thousands of miles. This is in contrast to the other frequency ranges mentioned, which correspond to different categories of radio frequencies. For example, the VHF (Very High Frequency) range starts at 30 MHz, and the UHF (Ultra High Frequency) range includes frequencies from 300 MHz to 3 GHz, both of which are not classified as HF. Thus, the specified range of 3 to 30 MHz definitively identifies the HF band.