I live pretty far away from Colorado WWVB, but there is one window sill in my home where my G-Shocks "catch the wave" pretty well.
But this fall/early winter, syncing has been spotty. One interesting thing, however is that my GWM5610 is having a much more difficult time syncing than my GW5000.
The 5000 has caught the wave four or five times in the last three months, whereas the 5610 has only once. This is sitting side-by-side on the window sill overnight.
I used the 5000 as a reference to manually set the 5610 a week ago. Wish I would have let the 5610 continue to drift, but I thought it would sync by now. It would have been fun to see just how far the 5610 drifts off the correct time.
The reason I'm surprised that 5610 isn't performing as well in this regard as 5000 is the former has a plastic case, with the latter being all steel. I'd heard that the radio wave is harder to catch through an all-steel case.
Perhaps the Waveceptor 6 5000 has improved chip technology regarding antenna as compared to the older Waveceptor 5 5610?