What happens to unreceived signals? (Like WiFi, Bluetooth etc.)
Radio/"wireless" signals are actually "light waves" ... when a signal is sent from an antenna, the same thing happens to the signal as happens to the "signal" (light) from a light bulb when you turn it on.

It moves away from the signal source in all directions, and continues moving until it's absorbed by something, or bounces off of something &amp; starts moving in another direction.