Reddit mentions of Spirit Box P-SB7 For Ghost Hunting

Something like this I think

You seem utterly convinced of your own bullshit, so I'm going to explain a little about science and critical thinking, before somebody else reads your comments and becomes dumber for doing so.

First, the source you link to isn't credible. It's a company trying to sell GPS trackers. Basically, you're saying that if a company produces a product and sells it on the internet, it must work. Going by that logic, it must really possible to speak with the dead, because they sell this on Amazon, therefore it must work, right? I mean, just read the reviews!

https://www.amazon.com/Spirit-Box-P-SB7-Ghost-Hunting/dp/B0036F9LUQ/ref=sr_1_7?ie=UTF8&qid=1550068721&sr=8-7&keywords=spirit+box

In all seriousness though, even tin foil can block GPS signals, there's no way for them to penetrate a metal safe.

https://en.wikipedia.org/wiki/Faraday_cage

https://www.techwalla.com/articles/how-to-block-a-cell-phone-gps-signal-with-foil

https://www.quora.com/Which-materials-can-be-used-to-block-GPS-signals

https://physics.stackexchange.com/questions/331273/can-gps-signals-penetrate-steel-in-the-thickness-of-few-centimeters

Even the metal case on newer smartphones will block radio waves and GPS signals, which is why they have external antennas, or they wouldn't function.

That said, I suppose you could create safes that have an external antenna embedded in the structure like on a smartphone casing, but the safe would have to be special made for this purpose. You wouldn't be able to simply "stick a GPS in the safe" like you're saying.