There are many ways to build a radio receiver, but most have a few ... job and leaves you with something like this homebrew all-band receiver. Granted, dispensing with everything but a detector ...
The Silicon Labs Si4735 is a single-chip solution for receiving AM, FM, and shortwave radio. With a bit of hacking, it even supports single sideband (SSB). All you’ve got to do is provide it ...
The Digital Radio Mondiale Consortium has released its DRM Consumer Radio Receiver Functionality Recommendation.