What is a UNICOM station?

Why: The FAA study guide states: "UNICOM is a nongovernment air/ground radio communication station that may provide airport information at public use airports where there is no tower or FSS."

• Reverses UNICOM's nature: it is a nongovernment station, not a government ATC facility, and it is not limited to Class B airports — it specifically serves fields without a tower or FSS.
• Invents a fictitious satellite-replacement system; the source describes UNICOM as a ground-based radio station.