Football

BlueThunder asked:


NFL quarterbacks and now selected defensive players have a radio receiver imbedded in their helmets for hearing play calls from the sidelines.

What precautions does the league have to prevent someone using a frequency scanner from listening in and relaying the called play to the other team?

And, what precautions does the league have to prevent someone in the stands, or even someone miles away, from flooding the frequencies used for the communications with a much stronger signal?

Ava