I guess you don't like having a reliable mobile phone service and undisturbed wifi at home.

The Polish radiostop system is completely unsecured, so it is rather bad example to have this discussion. But in general, when it comes to radio, it is unfortunately not as simple as "secure it better". Sure, you can use spread spectrum, CDMA and whatever else is there when it comes to radio, cryptography and information theory techniques but all of this goes down the drain if you just use strong enough jammer emitting carrier on top of your desired signal.