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Earth : A circuit connection to a ground rod driven into the ground or system of wires buried below the surface of the ground.
EIRP : Effective Isotropic Radiated Power. The sum of transmitted power and antenna gain, minus any transmission line losses.
EHF : Extremely High Frequency - from 30GHz to 300GHz
Electron Tube : (Also known as an Vacuum Tube or a Thermionic Valve). A device that creates or modifies an electrical signal through the movement of electrons in a low pressure (vacuum) space.
Elevation (1) : The angle that an antenna - often a beam - makes with the horizontal.
Elevation (2) : How high an object/place/station is above sea level. Same as ASL (Above Sea Level)
Elmer : Slang for a person who helps newcomers get started in amateur radio.
EME : Earth Moon Earth - bouncing a signal off the moon to a remote station that would not normally be accessible.
EMF : Electromotive Force - Voltage.
EMI : Electromagnetic Interference.
ERP : Effective Radiated Power.
Eu : Europe