The safety threshold for the FM radio band was lowered due to concerns about antenna resonance with the human body's wavelength.

“the only time they like lowered the safety threshold was for the FM Radio band because at FM radio wavelength or sorry frequency it's around 100 megahertz which the wavelength is 6 feet which is the size of a human body so by no with no scientific evidence at all they purely were like well that could be a concern because we know the antenna resonance effect is real we're going to lower the safety threshold uh make it more strict for 100 mahz so FM radio but for anything below that um and kind of above it we're going to we're going to raise it up and”