The copper section is the bottom end of the main antenna which is 55 feet tall and constructed from a length of heavy wall pipe. The antenna extends about 50 feet above the top plate of the tower and has two rows of vertical slots on opposite sides. The antenna has a 2 inch diameter copper pipe running from bottom to top in the center of the mast. Each slot has a stainless steel bar bolted just inside and to one side of the slot and is covered with a fiberglass cover. The tube that connects to the bottom of the copper section sends air up into the antenna in an attempt to keep it dry. The air supply is located down in the transmitter room. The 8 inch hardline that brings the RF to the antenna has a gas stop located just before the line connects to the bottom of the antenna. The antenna was design by RCA to be un-pressurized, but failed several times over the years due to moisture entering the antenna and migrating into the transmission line pooling next to the gas stop. Water and RF don ’t mix so well so the gas stop would burn away and start a chain reaction that would generally result in several hundred feet of burnt transmission line.