But satellite signals are like signals from transmission towers, which must also be beamed through the air. However they are not broadcasts. A broadcast is a signal that is basically thrown out into the air and is meant for anyone that wants to listen in. A private communication is meant for specific parties only. However that sometimes is only a matter of semantics.
Cell phones use the airwaves just like radio stations do, but they are considered private.
Although in reality they are not. Like television privacy is merely an illusion. Once a signal is a broadcast, it is private only because we say it is and because we decided configure our technology to make it so. That is the only difference and is why we have scrambled cable channels and encryption technology. We dont like it.