what is a conductor? The one we use in weather?

Answer 1

What you are discribing is called a lightning rod

It is placed at the highest point of a building to keep the electrical charge from hitting the building. Lightning rods are pointed copper or aluminum rods placed on roofs of homes and buildings as a method of protecting property from lightning damage. Lightning rods do not attract lightning, but simply provide a favorable path of low resistance for current
to travel to ground. The purpose of a lightning rod system is to
prevent physical damage and to keep the protected structure fromburning down by conducting current and the associated heat away from the structure. However, electromagnetic waves produced by lightning can induce current in nearby electrical wiring and circuitry. This secondary effect of lightning can cause extensive damage to electronics, including computers and modems, televisions, telephones
and answering machines.

See these link regarding lightning rods.

The Lightning Protection Institute
http://www.lightning.org/?page=home

how lightning rods work
http://science.howstuffworks.com/lightning7.htm

LIGHTNING SAFETY LINKS

http://www.nssl.noaa.gov/edu/safety/lightning.html

http://www.lightningsafety.noaa.gov/more.htm

http://www.lightningsafety.noaa.gov/overview.htm

http://www.lightningsafety.noaa.gov/

http://www.srh.noaa.gov/oun/severewx/safety.php

http://www.nssl.noaa.gov/primer/lightning/ltg_faq.shtml

http://newweb.wrh.noaa.gov/hnx/LightningMyths-1.pdf

http://www.lightningsafety.noaa.gov/survivors.htm

Answer 2

Do you mean a lightning conductor? The metal rod that projects from the top of tall structures so that lightning strikes the metal and not the structure. The electric charge is then run to ground through a metal strip, often copper, and acting in much the same way that a length of electric cable does (only bigger).