Stonehenge, the most famous antiquity on Salisbury Plain
Marconi's first transmitter incorporating a monopole antenna. It consisted of an elevated copper sheet (top) connected to a Righi spark gap (left) powered by an induction coil (center) with a telegraph key (right) to switch it on and off to spell out text messages in Morse code.
Rough map of military training area (green) on Salisbury Plain within Wiltshire (blue) (it accounts for about half the area of Salisbury Plain)
British Post Office engineers inspect Marconi's radio equipment during a demonstration on Flat Holm Island, 13 May 1897. The transmitter is at centre, the coherer receiver below it, and the pole supporting the wire antenna is visible at top.
Stonehenge, on Salisbury Plain
Plaque on the outside of the BT Centre commemorates Marconi's first public transmission of wireless signals.
Military use makes some areas of the plain inaccessible to the public.
SS Ponce entering New York Harbor 1899, by Milton J. Burns
Typical grassland at Netheravon Down.
Marconi watching associates raising the kite (a "Levitor" by B.F.S. Baden-Powell ) used to lift the antenna at St. John's, Newfoundland, December 1901
The burnt-tip orchid (Neotinea ustulata) can be found on Salisbury Plain
Magnetic detector by Marconi used during the experimental campaign aboard a ship in summer 1902, exhibited at the Museo Nazionale Scienza e Tecnologia Leonardo da Vinci of Milan.
The Duke of Burgundy butterfly (Hamearis lucina)
Marconi demonstrating apparatus he used in his first long-distance radio transmissions in the 1890s. The transmitter is at right, the receiver with paper tape recorder at left.
The cuckoo bee Nomada armata
Marconi caricatured by Leslie Ward for Vanity Fair, 1905
The fairy shrimp Chirocephalus diaphanus
Villa Marconi, with Marconi's tomb in foreground.
The stone curlew
American electrical engineer Alfred Norton Goldsmith and Marconi on 26 June 1922.
Guglielmo and Beatrice Marconi c. 1910
Memorial plaque in the Basilica Santa Croce, Florence. Italy
Guglielmo Marconi Memorial in Washington, D.C.
Bronze statue of Guglielmo Marconi, sculpted by Saleppichi Giancarlo erected 1975 Philadelphia, Pennsylvania

In September 1896, George Kemp and Guglielmo Marconi experimented with wireless telegraphy on Salisbury Plain, and achieved good results over a distance of 1.25 mi.

- Salisbury Plain

A further series of demonstrations for the British followed, and, by March 1897, Marconi had transmitted Morse code signals over a distance of about 6 km across Salisbury Plain.

- Guglielmo Marconi

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A US Army Signal Corps radio operator in 1943 in New Guinea transmitting by radiotelegraphy

Wireless telegraphy

Transmission of telegraph signals by radio waves.

Transmission of telegraph signals by radio waves.

A US Army Signal Corps radio operator in 1943 in New Guinea transmitting by radiotelegraphy
Amateur radio operator transmitting Morse code
Tesla's explanation in the 1919 issue of "Electrical Experimenter" on how he thought his wireless system would work
Thomas Edison's 1891 patent for a ship-to-shore wireless telegraph that used electrostatic induction
Example of transatlantic radiotelegraph message recorded on paper tape at RCA's New York receiving center in 1920. The translation of the Morse code is given below the tape.
In World War I balloons were used as a quick way to raise wire antennas for military field radiotelegraph stations. Balloons at Tempelhofer Field, Germany, 1908.
Guglielmo Marconi, the father of radio-based wireless telegraphy, in 1901, with one of his first wireless transmitters (right) and receivers (left)
German troops erecting a wireless field telegraph station during World War I
German officers and troops manning a wireless field telegraph station during World War I
Mobile radio station in German South West Africa, using a hydrogen balloon to lift the antenna

The first practical radio transmitters and receivers invented in 1894–1895 by Guglielmo Marconi used radiotelegraphy.

Preece and the GPO in Britain at first supported and gave financial backing to Marconi's experiments conducted on Salisbury Plain from 1896.