@loriemerson
FYI, the Public Radio Service channels are:
409.7500 to 409.9875, NFM, ITU-R F3EG,12.5KHz steps, for 20 channels.
@loriemerson
Just thinking about digital over open channels: MFM over 2.4GHz and 5.8 GHZ; or over the Chinese Public Radio Service on 440MHz. Remember acoustic couplers? Should be pretty easy to build an FSK box to plug into a standard handheld.