It certainly worked for the Navy's VLF Transmitters in Cutler Me with miles of antenna wire. When I was submerged at sea copying CW on 18KHz from NAA, in the midst of normal message transmissions from the easily read Bohme keyer, a marginal, hand-sent message, "QRX, De-Icing" would preceded several minutes of key down. 73 Barry, W5GN