Ham Radio Extra Class Practice Test 2025 - Free Extra Class License Exam Questions and Study Guide

The 70 cm band, which spans from 420 to 450 MHz, is correct because it is indeed shared with government and military users. In this frequency range, amateur radio operators have secondary allocations, meaning they must avoid interfering with primary users, such as various government and military services.

In this band, certain frequency segments may be used for critical communications, and amateur operators must adhere to strict guidelines regarding the use of frequency and power to minimize any potential interference. The shared nature of the 70 cm band highlights the importance of being mindful of communications in this spectrum, as well as the necessity of operating within designated parameters to ensure cooperation among all users.

The other bands listed do not share spectrum allocations with government or military services in the same manner as the 70 cm band. For example, the 40 m band primarily serves amateur radio operators with no significant military presence, while the 2 m band is used heavily by local amateur users and has specific allocations for public service, but is not primarily shared with government entities. The 10 m band is used by amateur radio operators without substantial overlap with government or military services.