Which organization's rules include limitations on radio power, antenna height, and frequency use?

The correct answer is the Federal Communications Commission (FCC) because this organization is primarily responsible for regulating all communications in the United States, including those that occur through radio frequencies. The FCC sets forth specific rules and regulations regarding the use of different frequencies to ensure that communication systems operate effectively and without interference. This includes establishing limitations on radio power, antenna height, and frequency use to promote safety, minimize interference among different users, and manage the radio spectrum efficiently. These regulations are vital for public safety communications, including those utilized by fire service, law enforcement, and emergency responders.

In contrast, the other organizations mentioned do not hold similar regulatory power over radio communications. Homeland Security focuses on federal security and emergency preparedness, the Federal Bureau of Investigation is primarily concerned with national security and criminal investigations, and the Federal Communications Security Division does not exist as a separate regulator in this context.