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Lid : In amateur radio, used to denote a poor or inept operator; a term originally from landline telegraphy.^{[1] [2]}

Loading coil : An inductor placed in series with an antenna element in order to lower the antenna's resonant frequency. May be used singly or in conjunction with a capacity hat.

LPDA : Log Periodic Dipole Array. A multiband Antenna

LSB : (1) Lower Sideband, used primarily in single sideband operation below 10 MHz

LSB : (2) Least Significant Bit, in transmitted digital data