Alexanderson alternator
The station used a huge antenna supported by eight steel masts, similar to the AT&amp;T long wave telephone transmitter at RCA's Rocky Point, Long Island, transmitter facility. During World War I, the original Marconi spark transmitter was replaced with an Alexanderson alternator, the invention of the famous General Electric engineer, with an output power of 200 kilowatts and looking like an ordinary power station generator. Its frequency was around 17 kHz, which made its wavelength around 17,500 meters.