Abstract: A locking assembly is provided with a mounting ring having at least one notch and at least one groove having an entrance adjacent to the notch. A locking ring of the assembly has at least one protrusion disposed in the notch of the mounting ring. A retaining ring holds the locking ring and the mounting ring together. The locking ring is normally biased toward a first, locking position in which the protrusion blocks the entrance of the groove and is moveable to a second, engagement position in which the protrusion is urged against the mounting ring to expose the entrance of the groove. The locking assembly is suitable for engaging and locking various devices having at least one tab, such as an RF feed of an antenna system.