John Smith ) writes:


Think again, my battery operated "atomic clock" has a built in antenna
and gets its update via shortwave!

Not likely.

There was a time when there were clocks that got data from WWV, but
they tended to be expensive and were never a mass market item.

The recent wave of such clocks use WWVH at 60KHz, and of course
they'd have a built in antenna. But these are far more common
than the old clocks that used WWV.

Michael