This is simple Experiment using Cable TV Antenna , Diode Germanium IN60 and Spectrum Lab Software free download.
Install Spectrum Lab on your computer and connect The Antenna to Diode Germanium IN60 and connect it to your PC/Laptop Micrphone Input. Connect The Ground and Antenna cable to Ground of Microphone Input and you will here some of Local Radio about ....km or ..miles with some noise background.