Interesting really simple and sensitive broadband antenna & receiver.
Rydberg Technologies' atomic radio receiver can selectively or simultaneously receive carriers in bands ranging from MHz to millimeter-wave. http://www.rydbergtechnologies.com/ https://www.technologyreview.com/s/611977/get-ready-for-atomic-radio/ https://arstechnica.com/science/2018/09/a-new-antenna-using-single-atoms-could-usher-in-the-age-of-atomic-radio/