WMG: GTA Radio

Area 53 is a parody of Coast to Coast AM type shows... in universe.
The host denounces most of the theory people call in with, despite being billed as a supporter of such things. He has a website that was last updated just before the year 2000 in 2008 (The registration would have expired and you'd get one of those damned URL squatters if he really had been in a bunker all that time.)
'The Journey' radio station in GTA IV is a disguised numbers station
One that transfers numerical codes, intelligently obscuring government codes through ambient music. The female voice is quite obviously from a high end text-to-speech program.