Passing thought, but do you have DSL coming into your home? I do where I am, and can't wait for the fibre cable to come, since our DSL wipes out the upper portion of the MW band centered right on 1620KHz. However, I've heard what you have +/- 500KHz from that like irregular squeaks, which I suspect is slop over DSL HET with night time MW propagation. Just an observation from what I've experienced where I am. Here's a test for ya. Do you hear any of this on your car stereo out in your drive way?