Why does an FM transmitter in a car drop out when the antenna is a few feet away? And why does the signal sometimes improve when one puts a hand on a charging cord connected to a Bluetooth device? What is that phenomenon called?
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Signals degrade for various reasons, distance, interference, physical obstruction, improper angles (not pointing in the right direction). FM is just frequency modulation, I would recommend looking into wireless signal propagation for more specific information about ranges, common problems etc. Hopefully this helps!
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