A hundred years ago this month, the cover of the April 1925 issue of Popular Mechanics shows author Lewis R. Freeman and his companions at the controls of a four-tube radio set during an expedition to the Canadian Rockies. In 1923, he had taken a radio to the Grand Canyon and successfully pulled in stations, despite assurances by so-called experts that reception would be impossible. Emboldened, he was asked to join the Canadian expedition, and brought along the four-pound radio. Batteries and other accessories added forty pounds.

The first night’s listening pulled in Oklahoma City, followed by Calgary, Pittsburgh, and Los Angeles, before it even got dark. Freeman reported that during the course of the expedition, a majority of the high power stations east of the Mississippi were heard, along with stations as far south as Baton Rouge, and practically everything in the Pacific Northwest, British Columbia, and Alberta.