Meaning of lecher wires

lech'er wires"

Pronunciation: (lekh'ur), [key]
— Elect. Elect.
  1. parallel wires of such length and terminations that the system will resonate, producing standing waves, if the frequency of the excitation is correct.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.