Mont. Code § 27-1-813
Nothing in 27-1-811 or 27-1-812 may be construed to relieve any person broadcasting over a radio station from liability under the law of defamation or to relieve any person, firm, or corporation owning or operating a radio broadcasting station from liability under the law of defamation on account of any broadcast prepared or made by a person, firm, or corporation or by any officer or employee of a radio station in the course of employment. Whenever an owner or operator of a radio station is liable on account of a broadcast and two or more broadcasting stations were connected simultaneously or by transcription, film, metal tape, or other approved or adapted use for joint operation in the making of the broadcast, liability is limited solely to the person, firm, or corporation owning or operating the radio station that originated the broadcast.
§ 27-1-813, MCA