This is more resourceful than what I once did, which was set up an atomic clock "repeater" to get analog atomic clocks (one in each room) in a site to actually

This is more resourceful than what I once did, which was set up an atomic clock "repeater" to get analog atomic clocks (one in each room) in a site to actually receive the signal in a 1930s structure made of solid brick and concrete blocks. Except it wasn't a repeater so much as it was a MITM fake, with an rpi connected to an sdr-like system to generate a fake WWVB (iirc?) based off an NTP clock. Legality was technically questionable, but since the signal didn't really leave the site perimeter (or even the building, really), I think it was ok.