Eli5: Why does our car key FOB have work from far away if we bring it close to our head

Question

As the title states? Why does the fob emit signals far away when it is attached to our head?

In: 0

Answer 1

The fob doesn’t change what it does. But your skull reflects radio waves a bit, and so it acts a little like a parabolic dish does to focus the radio waves. For best results, tilt your head back and put the fob under your chin.