Deeper explanations for those who aren't satisfied:
https://physics.stackexchange.com/questions/94198/why-does-n...
https://ham.stackexchange.com/questions/6312/why-are-fm-radi...
https://physics.stackexchange.com/questions/94198/why-does-n...
https://ham.stackexchange.com/questions/6312/why-are-fm-radi...