High power transmitters.
Shortwave frequencies also reflect off the ionosphere causing their signals to be able to be picked up several thousand miles away at night (when the ionosphere is most stable), therefore some shortwave transmitters a licenced to operate at very high power (megawatt range) at night to take advantage of this effect.
Extremely Low Frequencies (ELF) can travel worldwide as the waves follow the surface of the earth, but require enormous transmitting antennas (many miles in area). They have few practical uses, however the military considered it as a way of signaling nuclear missile submarines that they have permission to launch their missiles.
Radio waves are in all parts of the atmosphere. Some, but not all, radio waves are reflected from the ionosphere, permitting transmission over greater distances.
Greater Napanee was created in 1999.
Greater Baltimore Youth Orchestra was created in 1977.
Sirius will have a greater angle, because it is closer to us.
Scientists in spent a lot of time looking for electromagnetic radiation at low frequencies - radio waves - after their theoretical prediction by James Clerk Maxwell in the 1860s. They were detected near lightning strikes and attempts were made to reproduce the effect artificially using electric sparks. Hertz in Germany and Popov in Russia were two of the early scientific investigators. Guglielmo Marconi developed the science into a means for communicating without wires - wireless telegraphy - and conducted experiments that spanned greater and greater distances until in 1901 a message was sent over the Atlantic from Poldhu in Cornwall to Newfoundland.
airship
airships
They have enabled man to get better weather forecasts, communicate over much greater distances, and send data around the planet at much greater speeds.
distances are greater between outer planets
That is the correct spelling of the word "further" (to a greater extent).The word farther should normally be used for distances.
Audio Amplifier
It is when transmission distances are greater than five miles
traveling greater distances.
Not normally
Not normally
i don't know myself
They are the same distances