This portable (luggable?) Zenith radio featured a proprietary antenna that flipped out from the radio to pull in stronger or more distant am radio signals.
When stowed, it looked like a small, elegant suitcase. I have a https://neverjethot.com/blog/2019/02/25/happy-to-be-playing-again/ Zenith Transoceanic, which pulls in shortwave bands as well. It has a provision to run on batteries as well, but I wouldn’t call it “portable”. Wouldn’t it be sweet if devices had today’s technology, but the Zenith’s old world craftsmanship?