Comment [on ‘A new interpretation of the VLF impedance measurements of island slot antennas’ by R. Barr]


  • M. G. Morgan


The contention by Wait (1979) and Barr (1980) that the resonance at 9.5 kHz observed at the input to the Deception Island feed line (Morgan, 1979) was due merely to reduced phase velocity on the feed line is disputed. Greatly reduced phase velocity occurs only when a line is buried or laid on smooth earth, but the line at Deception Island was laid over very rough and steep terrain, and a resonance at 60 kHz demonstrated that the phase velocity on the line was essentially that of free space.