How protected is any network? Even ethernet networks can be tapped into (if not easier), I have a phone line and broadband going into my house, for the first foot outside it is unprotected, it could easily be spliced into. Security has been greatly over looked in the rush to get networked.

Don't Forget -

Frequency hopping was the cheaper alternative to the "real" spread spectrum designed for secure tactical communications in noisy environments. If you wanted "secure" communications you should have asked.