Be careful not to install antennas too close to overhead lines. SRP recommends they be installed no closer than twice the length of the assembled antenna. If your antenna can be rotated once it is installed, be sure it can't be twisted into or around nearby power lines. Covered antennas or non-metallic guy wires may not provide protection against electric shock. Keep all equipment away from power lines.
Mylar balloons can be dangerous when released into the air.
Because they are metallic, mylar balloons that come into contact with power lines can cause power outages. Whenever possible, please enjoy these balloons indoors. If they must be displayed outdoors, be sure they are well secured and never release them into the sky. Should a mylar balloon come into contact with a power line, do not attempt to dislodge it. Many utility poles have plastic casings that house high-voltage lines which carry power to underground lines.