What is the bandwidth of the FM/AM radio band?

Question

Arduino

What is the bandwidth for FM/AM broadcasting?
I built a Kharchenko antenna for radio, it is interesting to know the bandwidth in this range.
I know that there is still RDS - Radio Data System. The channel transmits the denomination of the radio station, program and service information.

I did not find such information in the questions asked.
Don’t throw tomatoes too hard, you just want to know more about antennas)
I will be grateful to everyone who responded!

Answer 1

The theoretical can be calculated according to Shannon , the practical one will be many times, or even tens of times lower.

Answer 2

https://habr.com/en/post/303104/
1187.5Hz here it is