It might surprise you to know that the common tape measure is not only one of the essential items needed in a home tool kit, ...

In the photos you can see a measuring tape running the length of the wires for measuring the distance from the end of the Lecher line to the nodes. By doing so, you’re measuring the wavelength ...

Think of them in the same way as you would the 1-foot markers that line your tape measure, just less obvious. These signifiers were especially important in the older days of lumber and construction.