> It is a holiday miracle for small low power handheld devices.
Is it really? Isn't the signal blocked if a person simply walks between he devices? i.e. if you are wearing a receiver and just turn around you will lose connection.
I'd recommend taking the ham radio technician license, as it explains the various antenna types and radiation lobe patterns. You can learn a lot, meet some smart people, and may develop a different perspective on electronics in general.
Is it really? Isn't the signal blocked if a person simply walks between he devices? i.e. if you are wearing a receiver and just turn around you will lose connection.