It is a simple home made instrument made of two wooden pieces one foot long 1.5"broad &.5"thick.Out of this one is fix & one is moveable & it is half round so that it move easily without touching ground.Most important part of this instrument is to fix laser to the moveable piece such a way that at 0°rays are parallel to the ground.
To use it you must know the azimuth & elevation of the sat . You find the azimuth degree by magnetic compass place the instrument horizontally in that direction & adjust the elevation degree on the instrument & then press the laser switch if there's any opstruction like building or tree laser rays will hit. This experiment must be done only at night time