SEOUL — Ham radios once played a key role in the operations of the U.S. military before fading into the background with the arrival of better and more accessible forms of communication like cell ...

There are more than 2,000 active satellites orbiting Earth. At the end of their useful lives, many will simply burn up as they reenter the atmosphere. But some will continue circling as "zombie" ...

A prior version of this story stated incorrectly that “the higher the frequency, the shorter the wavelength, and the farther signals can travel.” It has been corrected as follows: “Such shortwave ...

Having a big bookshelf of ham radio books and magazines used to be a point of bragging right for hams. These days, you are more likely to just browse the internet for information. But you can still ...