Four friends climb Copper Ridge and find the fence, the building with no windows, and a steel door with a warning no one ever explained. From The Station, Part 1: Do Not Listen.
Listen: https://www.midnightsignals.net/the-station-part-1-do-not-listen/
A Midnight Signals story. A work of fiction.
Image: "Night sky radio towers" by Unknown author, CC0, via Wikimedia Commons, https://commons.wikimedia.org/?curid=82747940