In a fascinating survey published in Fate Magazine(1), Scott Corrales(2) chronicled reports of anomalous or alien radio messages. There was the case of Octavio Ortiz, a Chilean who said he received ham radio communications from "Ariel," a voice that claimed to be "not of this world [and yet] belonged to humankind." In one instance in 1985, a UFO appeared over Ortiz's home while Ariel was transmitting. Corrales noted that a ufologist who studied the incident, found that other ham radio operators in the area reported interference during that time frame.
The SAMIZDAT newsletter makes a correlation between UFO abductions and areas high in levels of ELF radiation and FM radio waves, Corrales wrote. The newsletter goes on to site the case of "Alicia" a woman from Rosario, Argentina (a city with a large number of FM stations) who while riding a public bus and listening to her Walkman radio, suddenly heard the music drastically change to a foreign language choral piece. According to her account, she became paralyzed in a white fog, and was temporarily transported to a spacecraft.
A phone call from an "alien" was received on the Greater London Radio program in January 1971 according to the article Alleged TV and Radio Broadcasts from Space(3)by Jon Hurst. Speaking in a "cold metallic voice," which claimed to be of extraterrestrial origin, it declared to the host "I have not phoned you, I am speaking by thought-transference guided by computer."