I have been eavesdropping on SW/LW bands since I was a child. I used my grandfather's radio set until I scraped up the cash for my own. I spent countless nights into the early morning hours just listening to the noises and foreign languages. I wonder now how much that pastime may have influenced my fascination with the paranormal. I wonder how much of what I listened to "could" have been paranormal...or at the very least could help explain what is thought to be paranormal.
Since SW/LW receivers are almost as readily available as AM/FM. I'm not sure the FCC could do anything about use as ghostboxes; as long as the modification does nothing more than scan received signals.