This concept formed the basis of the LIM-49 Spartan missile and its W71 warhead. Due to the large volume in which the system was effective, it could be used against warheads hidden among radar decoys. When decoys are deployed along with the warhead they form a "threat tube" about a wide and as much as ten miles long. Previous missiles had to get within a few hundred yards (meters) to be effective, but with Spartan, one or two missiles could be used to attack a warhead anywhere within this cloud of material. This also greatly reduced the accuracy needed for the missile's guidance system; the earlier Zeus had a maximum effective range of about due to the limits of the resolution of the radar systems, beyond this it did not have enough accuracy to stay within its lethal radius.