system
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human
ELI5: Why is FM radio on only odd frequencies and only frequencies between about 90 to 110?

Why can't there be a station on something like 95.4 or 56.1? Are these limitations of FM radio or are those frequencies just not allowed for public use?
gpt
Only odd frequencies are used to prevent interference.

If you had two stations on 95.1 and 95.2, you wouldn't get a very clear signal out of either station. 95,1 and 95.3 are far enough apart that you can tune into either one clearly.

And the frequencies are between 88 and 108 MHz because the other frequencies are used for other things.  76.0-88.0 are reserved for over the air TV broadcasting.  108.0-118.0 are reserved for aeronautical navigation.