A TRANSMISSION LINE is a device designed
to guide electrical energy from one point to another.
It is used, for example, to transfer the output rf energy
of a transmitter to an antenna. This energy will not
travel through normal electrical wire without great
losses. Although the antenna can be connected
directly to the transmitter, the antenna is usually
located some distance away from the transmitter. On
board ship, the transmitter is located inside a radio
room, and its associated antenna is mounted on a mast.
A transmission line is used to connect the transmitter
and the antenna.