Which of the following is an important safety precaution to observe when putting up an antenna tower?
Why Contact between a tower section, mast, or antenna and an overhead power line is the leading cause of fatal amateur antenna accidents. Before you raise anything, survey the site and make sure the tower or mast cannot reach any utility line even if it falls in any direction. A good rule is that the distance to any power line should be greater than the total height of what you are raising.
Watch out Insulating the tower base is backwards: towers must be bonded to a good ground system so lightning energy goes to earth rather than arcing through the structure or the shack. A wrist ground strap is an anti-static tool for handling circuit boards, and it would be a hazard near high voltage.
Look up before you lift: keep the falling radius clear of power lines. Towers get grounded, never insulated.