So you can get an atomic clock with the reciever. If the reciever doesn't pick up the signal (try to get an ultra atomic one, it's the newer protocol), you can kinda hack it with your own DIY transmitter. 

But, if you just want one get one of these: https://www.lacrossetechnology.com/collections/ultratomic-time

I've seen them for 50% off at Walmart though. 

 Awesome thank you!