I'm trying to build a simple AM crystal radio, however, I'm not getting any voltage registered when using it. This is the kind that's only powered by the radio waves. The site I was using to design it makes the circuit clear and how the radio works pretty self-explanatory, but I couldn't read their diagram for making a good antenna. Right now I just have a wad of 22 gauge insulated speaker wire I'm holding up really high so I figured I'd ask stackexchange how to make a good antenna.
How can I build a good antenna for a crystal radio? Here's the site http://www.sciencebuddies.org/science-fair-projects/project_ideas/Elec_p014.shtml