My father sourced a shortwave radio transmitter for our refurbished radio. It has a magic eye like the radio. I put it on top just to work out the setup. Its a Central Electronic brand that was made in the 40’s. I have to admit that listening to its transmission give a sense of authenticity to its sound, like I discovered a radio station that plays music I like. Kind of like adding a tube distortion to a guitar, you know when its the real thing.