I've seen a video of one of those copper plate devices destroying an armored limo. it was planted in a back pack tied to the handle bars of a bicycle. The bike was parked next to a telephone pole (probably chained to the pole) and the handle bars turned to aim the device to the spot the limo would soon occupy, then set off by remote control.
The limo was bounced into the air and spun around by the impact, it looked like it had fallen out of an airplane with shreded metal trailing every which way.
This was used by the Red Army Faction in Germany to kill a high level banker.