Who sets the limitations on radio power, antenna height, and frequency use?

The correct answer is the Federal Communications Commission (FCC) because the FCC is the regulatory body responsible for managing and overseeing communication by radio, television, and other forms of transmission within the United States. This includes setting specific limitations on various parameters such as radio power output, antenna height, and frequency use to ensure that communication services operate effectively and without interference. By establishing these regulations, the FCC promotes efficient use of the radio spectrum, which is a limited resource, and helps maintain safety standards in communications, especially for critical services like fire and emergency response. The local fire department, state governments, or FEMA do not have the authority to set these technical parameters on a national scale; their roles may focus on operational procedures or emergency management instead.