Shortwave radio listening (SWL) was my first serious hobby. Actually, I tell a lie. It was Medium Wave listening on the frequencies just below shortwave radio, also known as the AM Broadcast Band. During junior high school, a few of us joined the Canadian International DX Club, which at that time was based in Winnipeg. DX means “distant transmission” and that’s what we did: listen to shortwave radio and AM broadcast band transmission from distant stations.