Keeping things vague keeps things scary! Number stations have always freaked me out, but I think a lot of horror writers dive too deep into the "lore" to keep it scary. You show a lot of restraint here and I thinks that works really well. I also think it's nice that you were still able to do some light characterization for the narrator, given the word limit. Things like that help so much for stories like this, and i'm not really sure why. Oh well, great work!