The KVN antennas are also designed to be a shaped-Cassegrain-type antenna with an AZ-EL mount. The telescope has a 21m diameter main reflector with a focal length of 6.78m. The main reflector consists of 200 aluminum panels with a manufacturing surface accuracy of about 65 µm. The slewing speed of the main reflector is 3 ◦/sec, which enables fast position-switching observations(Table 3). The sub-re ector position, tilt, and tip are remotely controlled and modeled to compensate for the gravitational deformation of the main reflector and for the sagging-down of the sub-reflector itself.