[MilCom] Iraq Remotely Detonated IED's Countermeasures?

[Ken]

I'm sure most of you have been following the activity in Iraq..  A 
signficiant amount of military casualties have been caused by improvised 
explosive devices along the roadway.

At best what can be pieced together from the news, these devices have been 
remotely detonated. Just wondering if the majority of these were a wired or 
wireless remotely detonated devices & perhaps what frequency range the 
transmitters are in?

Additionally, I thought I read (perhaps on fedcom) that in the presidential 
motorcade there was a vehicle with specialized radio equipment that could 
jam wireless controlled explosive devices...

I wonder IF this technology was every deployed to Iraq?

Ken