I have a small Tecsun PL-360 SW/LW/MW/FM commercial broadcast radio receiver, which is very compact and will quickly scan all frequencies. It will not readily pick up CW/SSB/USB or Air Band FM though. It uses digital IF signal processing so gives very reasonable sensitivity and high speed tuning for its size. It would be useful though as a backup for conventional radio being quite compact and can use conventional AA batteries. The AA cells can even be recharged though its USB power port.