[steveegg]

All one has to do is target the towers, which I think HARM can do. If they're using cell towers, while they're much harder to target (more of them, and they're usually piggybacked onto a civilian target), the range is less simply because the signal used is weaker.

[eno_]

Hard to do: AFAIK "passive radar" could use satelite TV or other space-based transmissions. And since the recievers are passive, they are hard to find. Iraq's phone system will be good for about 15 minutes after the first bomb falls, anyway.