The Radio Towers are a line of factories constructed by the Murkoff Corporation in a remote settlement in Arizona, later named Temple Gate by its inhabitants, in order to create an isolated environment for testing their mind control experiments.
The towers emit large flashes of light, followed by a loud humming noise, which engulfs the sky for a brief second. The light is powerful enough to disrupt an airborne vehicle's engine and even kill small animals, such as birds and fish. Temporary subjection has minimal effects, however, long-term exposure causes individuals to hallucinate and experience events unique to them. These events are usually grounded in the person's psyche and might be connected to their past experiences; in Blake's case, the guilt of not saving Jessica causes him to relive these events with a demonic figure haunting him throughout. This also makes the victim prone to manipulation, as evidenced by the area's cultists who were easily persuaded and sometimes experienced these divine delusions for themselves after these ideas were forced upon them. Unassertive or insecure people in general were shown to be easier targets. These experiments overtime would deteriorate the person's mental health, making them less rational and more childish in behavior; nearing the end of their journey, Blake's speech deteriorates into gibberish and starts to refer to the authorities as "adults".
Attempts have been made to reach the aforementioned facilities, however, the traveler would usually be overwhelmed by the light's effects and its inaccessibility by foot. It's speculated that these factories might also use airborne chemicals and the light as a method of triggering these hallucinations. For unknown reasons, the device caused Lynn to appear nine months pregnant. In reality, this caused some kind of internal swelling in the abdominal area, which led to internal bleeding, a similar condition caused by the Morphogenic Engine.
Blake and Lynn Langermann travel to a remote location in the Arizona desert via helicopter to investigate the murder of a Jane Doe. Moments later, they're struck by a flash of white light that disables the aircraft's engine, causing them to crash.
While searching for Lynn, Blake is struck multiple times by the light and is caught in multitude of delusions, ranging from his childhood trauma to the cult's biblical assertions of swarm of locusts and blood rain.
Upon reconciling with his wife, Blake discovers that Lynn appears to have gone through full nine months of pregnancy in a single night. After escaping into the chapel, Lynn supposedly gives birth to a child. Before dying from internal bleeding, she utters "there's nothing there", implying that the child is a hallucination, further backed up by it not having a shadow.
At the break of dawn, all cultists had committed suicide after Knoth proclaimed that "God has gone silent". Leaving the chapel, Blake looks at the horizon as the sun expands and swallows the sky, suggesting that Blake has fully succumbed to its effects.