I can’t remember when I saw it but it was probably made between 1980-2000.
The movie is about this wierd frequency or transmission that is actually a message from the devil. A group of people are isolated in this small building and they are trying to figure out if it’s an alien message. However those that listen to the message start turning evil, except for this one christian girl who sees the message as it is. I think there was a guy that she saved by telling him what the message was.
That’s all I can remember but can anyone help?