Improvised Explosive Devices, or IEDs, are one of the largest sources of coalition casualties in Iraq. Many of these IEDs take the form of roadside bombs, which are hidden on or alongside a road, then detonated when a moving vehicle passes near them. While there is more than one way of causing these bombs to detonate, they are often set off by a hidden human observer, using a radio-control device. Forces using the new Vehicle Protection Jammer from EADS subsidiary Cassidian, however, should find themselves at a greatly-reduced risk of such attacks.
The Jammer works by detecting and classifying radio signals that could be used to set off a bomb. It responds in less than a microsecond, by transmitting jamming signals tuned specifically to that band.
It is reportedly more energy efficient than previous jamming systems, as it only transmits when it detects a signal, as opposed to continuously.
According to Cassidian, the system is compact enough that it can even be installed on smaller vehicles.
You can't blanket all channels at once either, because they all interfere with each other. You CAN put out enough interference, to make an outside transmitter unable to penetrate the noise you are generating though. This means the bomb you are about to run over, can not receive its destruct transmission. until you have passed on by, and out of range.
I do know a couple ways to defeat that technique, but I will not lay that info out here.