When installing television, citizen's band or ham-radio antennas, have someone on the ground direct and monitor your work to prevent possible contact with power lines. The horizontal distance between an antenna and an overhead line should be at least 1.5 times the height of the antenna and its mast assembly. Never erect or remove an antenna on a rainy day or when a storm is expected because you risk being struck by lightning. Consider hiring a qualified contractor to install the antenna. Know the location of underground electric, natural gas, telephone, cable television, water and sewer lines before digging, and dig well away from those locations once you know where they are.
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Never use an electric lawn mower on wet grass, and postpone using electric tools if working surfaces are wet or if it's raining. Be aware of overhead lines while participating in any outdoor activities.