A WWVB receiver is on my todo list. I did buy a cheap module that they use in clocks, and I get no signal whatsoever (New York City). WWV (shortwave) I can hear sporadically. That is basically a result of the modules using the legacy WWVB signal, and not the newer phase-modulation signal, which is easier to receive at low signal strengths.

Having said that, this has been on my to-build list for a while, though: http://www.maxmcarter.com/rubidium/index.php

I also want to run the WWV-time-of-arrival experiment myself, and I think I have all the equipment necessary, just haven't done it. https://www.physics.princeton.edu//pulsar/K1JT/HFTOA_1.pdf