Some of the technological applications of superconductivity include: the production of sensitive magnetometers based on SQUIDs fast digital circuits (including those based on Josephson junctions and rapid single flux quantum technology), powerful superconducting electromagnets used in maglev trains, Magnetic Resonance Imaging (MRI) and Nuclear ...
An antenna (plural antennae or antennas), or aerial, is an electrical device which converts electric power into radio waves, and vice versa. It is usually used with a radio transmitter or radio receiver.
Gain is a relative measure of an antennas ability to direct or concentrate radio frequency energy in a particular direction. or pattern. Gain is typically measured in dB over Isotropic point source, dBi. The analogy of an Isotropic point source. would be a sun in the center of a universe.