The rectangular hole is enough to finish up the mast pole column column now up to adjust the antenna by survey contractors to put a steel pole holder, rope, and then wait for the images pouring cement, but the poles or may be cant, which survey, most all the exact height not exceeding 1 cm, and use the camera to shoot into the target line quantity surveyor with the assistant by suem on camera and see the enter the coordinates into the machine and pull the two water balls hit the target set, it will shoot up to laeoklong point are the coordinates and then calculate the 4 corners that much and twist pole, subcontractors pull rope or push pole to where you want to.
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