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Radio Transmission

A radio.  Source: Microsoft.

Radio transmission works with or without line of sight. If line of sight is possible then transmission can take place between sending antenna and receiving antenna. The placement of antenna has to take into account the curvature of the Earth with antenna being built taller accordingly. This will also allow for greater transmission distances. If line of sight cannot be implemented then signals can be broadcast to the upper layers or the atmosphere or space and then transmitted back to Earth.

The electromagnetic spectrum used for radio communication consists of eight distinct ranges which are regulated by government authorities:

Name Description Range
VLF Very low frequency 3 - 30KHz
LF Low frequency 30 - 300KHz
MF Middle frequency 300KHz - 3MHz
HF High frequency 3 - 30MHz
VHF Very high frequency 30- 300MHz
UHF Ultra high frequency 300MHz - 3GHz
SHF Super high frequency 3 - 30GHz
EHF Extremely high frequency 30 - 300GHz

Click on this link to review the wikipedia resource on radio.

Next: Satellite Transmission