AM signals can reach much further than 100km at night, thanks to physical properties of the ionosphere. When I was younger, I remember driving long distances at

AM signals can reach much further than 100km at night, thanks to physical properties of the ionosphere. When I was younger, I remember driving long distances at night in rural New England and being able to pick up one of the big Chicago stations more than 1500 km away. Commenters on this blog post about the phenomenon claim to have done much better with special antennas, e.g. picking up a station in Los Angeles from Queens, NY: https://news.ccrane.com/2018/07/23/why-am-listening-at-night-is-better/ https://news.ccrane.com/2018/07/23/why-am-listening-at-night...