There's One Line I Don't Mind Waiting In. "THE GRAY-LINE or GREY-LINE"
Drive Thru Lines, School pick-up Lines, Bank Lines, Grocery Store Lines, Airport Lines and the lists of lines can seem almost endless. Recently I've come to enjoy standing and waiting in what's called "THE GRAY-LINE" or "GREY-LINE". Since I'm in the U.S., I'll use the Gray-Line spelling. What is "THE GRAY-LINE"? For those new to Ham Radio or have not move that far along in their journey of the hobby; it can be defined this way. "THE GRAY-LINE" is a band around the Earth which separates daylight from darkness. Propagation along the gray line is very efficient. The main reason is the D layer of the ionosphere, which absorbs HF signals, disappears rapidly on the sunset side of the gray line and it has not yet built upon the sunrise side. In the YouTube below Dave Casler explains. I've worked "The Gray-Line" on many occasions over the years but not in the last few years. Here it is August 2025 and August is ty...