"Roger Long" wrote in
:

Correction: The remains of the Prospect Harbor antenna are still
visible on Google Earth. I was looking in the wrong place. It's also
a lot smaller than it seemed when I was sitting in a Kayak, only about
a quarter mile in diameter. It was still pretty impressive.

--
Roger Long





While we're on the subject of low freq antenna arrays, here's the one that
sets your automatic clocks, WWVB, Ft Collins, Colorado on 60 Khz:

http://tf.nist.gov/stations/wwvb.htm

My last visit to the station was when I was in PMEL (Precision Measuring
Equipment Laboratory) school at Lowry AFB, CO, in 1966. We were on a tour
of the, then, National Bureau of Standards (now NIST) labs at Boulder when
one of the NBS guys found out I was a ham radio op. He invited me to come
to WWVL (20 Khz but discontinued in 1972) and WWVB on 60 Khz, still using
the same, but refurbished, antenna array, today.

It's a very interesting loaded antenna on a frequency where the wave is
5000 meters long!

Look around and you'll see the bit rate is 1 bit per second, requiring each
code to take 1 minute to send. That's why it takes hours for your new
radio clock to set itself. It has to wait until it hears the right code
train at 1bps.