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!
For me this normally happens if I’m in traffic and someone else has an fm transmitter in the car infront.
The transmitters use a common frequency band so it is possible to get overlap.