THIS IS NICOLA TESLA'S "SPIRIT RADIO". The drawings are available, you can make it, if you have the courage - because you will her spooky voices - from "the other side". This even freaked out Nicola himself. Here is a link where you can go and see how to build one and what to expect.
https://gizmodo.com/5390059/build-the-spirit-radio-that-creeped-out-tesla-himself