I didn't see the ARRL article, but I have researched this on the Web. Type these words into Google:
fcc hf df The first hit is a map of where they all are. Most are unmanned. They are all linked to a single manned command center. I'm not certain what type of antennas they use. I studied the satellite images, but all I could make out were the antenna support structures. It looked like V-beams to me, but I'm not sure. 73, Mike www.w0btu.com On Sun, Feb 8, 2015 at 1:18 PM, <n0...@juno.com> wrote: > IIRC, quite some years ago, QST had a photo & description of a FCC "signal > locator" (for lack of a better description) consisting of several remote > receivers that were linked together. > > Anyway, these could instantly locate the origin of a skywave signal with a > resolution of a city block(!!) using a precise timing equipment/technique. > _________________ Topband Reflector Archives - http://www.contesting.com/_topband