I've had an inexpensive GPS antenna "puck" on my roof attached to a 2nd or 3rd gen raspberry pi inside, providing accurate time to my home for over a decade. Th

I've had an inexpensive GPS antenna "puck" on my roof attached to a 2nd or 3rd gen raspberry pi inside, providing accurate time to my home for over a decade. This is a sub-$100 project and very fun.