To do such things over copper wires requires frequencies of a megahertz or more.
From the economist.com
The wireless industry currently holds roughly 500 megahertz of licensed spectrum.
From the washingtontimes.com
In 2008, Verizon Wireless spent $9 billion on spectrum in the 700 megahertz band.
From the dailyherald.com
But at the specific frequency of 1720 megahertz, the cloud acted like a maser.
From the newscientist.com
Its basic clock rate, 1 megahertz, was the fastest of the early British computers.
From the en.wikipedia.org
They discovered that home wiring is a remarkably efficient antenna at 27 megahertz.
From the sciencedaily.com
Of that, 100 megahertz would be shared with Defense Department radar systems.
From the washingtontimes.com
The computer company Digital also plans to sell 1000-megahertz chips by 2000.
From the newscientist.com
The company has been using the three-channel 800 megahertz system as a demonstrator.
From the charlotteobserver.com
More examples
One million periods per second
The hertz (symbol: Hz) is the SI unit of frequency defined as the number of cycles per second of a periodic phenomenon. One of its most common uses is the description of sine wave, particularly those used in radio and audio applications.
Megahertz (foaled May 4, 1999 in Great Britain) is an Thoroughbred racehorse who raced in France and the United States.
Unit equal to 1,000,000 hertz or 1000 kilohertz.
Usually abbreviated to MHz. A unit of measurement relating to the Clock Speed of a computer or, put simply, a measurement of how fast its Central Processing Unit (CPU) runs. Typical clock speeds of modern computers range from 500MHz upwards. ...
The clock speed of the microprocessor. The higher the number, the quicker the information is processed. MHz relates to how many millions of instructions can be processed per second.
One million Hertz. See also kHz and GHz.
How your head feels after 17 beers.
A measure of bandwidth and rate of information flow for analog transmission. One Mhz equals 10 to the sixth power cycles per second.