Dipole antenna other monopole) antennas on the basis of dipole antennas of which they are one half. German physicist Heinrich Hertz first demonstrated the existence of radio waves in 1887 using what we now know as a dipole antenna (with capacitative end-loading). On the other hand, Guglielmo Marconi empirically found that he could just ground the transmitter (or one side of a transmission line, if used) dispensing with one half of the antenna, thus realizing the "vertical" or monopole antenna. For the low frequencies Marconi employed to achieve long-distance communications, this form was more practical; when radio moved to higher frequencies (especially
Marconi Wireless Telegraph Company of America of United Wireless' tangible assets, which in turn on March 29, 1912 were sold by the parent company to American Marconi. It would later be alleged that this had unfairly benefited some British investors, in what came to be known as the Marconi scandal. The acquisition would prove to be a tremendous boost to American Marconi's fortunes, and the company boasted that "There is now nothing in the way of Marconi becoming the only system of commercial importance in the world." Recently passed laws required U.S. passenger ships to carry radio equipment, and American Marconi's near monopoly allowed it to