This is an unsettling broadcast, simply because there's no easy explanation for why this would be broadcast for 30 years. It's also an imagery thing that generates this creepy, intriguing mindset. The idea of a Russian broadcast, possibilities of ties with the Cold War, abandoned facilities still broadcasting static, etc...
I'm sure the actual explanation is very mundane and uninteresting, but we can always hope that there's a cryptic meaning to accompany a riveting story. Oh well.