The term utility station is used to describe fixed radio broadcasters disseminating signals that are not intended for reception by the general public (but such members are not actively prohibited from receiving).
Utility stations, as the name suggests, do broadcast signals that have an immediate practical use, by means of analog or usually digital modes; most often utility transmissions are of a "point-to-point" nature, intended for a specific receiving station.
Airports make voice weather broadcasts on HF, known as VOLMET.
Many maritime radio services are often known as utility stations, including as ship-to-shore and vice versa telephony and error-correcting radioteletype such as SITOR.
Data transmission may make use of encrypted RTTY, use Link-11 for radar tracking data, or use of Automatic Link Establishment (ALE) modes to set up communication links automatically.