Downlead

A downlead is an electrical wire or cable connecting an outdoor (particularly roof) structure to an indoor or ground structure.

Most often, it refers to the wire connecting an outdoor (particularly roof-mounted) television antenna to the interior, and may also be referred to informally as a drop.
It may also refer to the wires in a lightning protection system that connect the lightning rods to the grounding rods – formally, the bonding connectors that connect the air terminals to the ground terminals, and are also referred to as down conductors.

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