About Radio Signals, Frequency and Wavelength?

Firstly radio was invented as a method of sending and receiving bits of information. At one end of a radio signal there is a transmitter. Effectively this uses magnetic fields and electric fields to create electrons which are changed into the radio waves and set out into the ether. The fields of a radio wave oscillate through different strengths and the length of time taken for a wave to get back to where it started is a cycle. Now remember that radio waves move at a constant speed and when it oscillates differently, it will take a different time to complete a cycle. The distance that a wave travels in one cycle is the wavelength.
The lower the frequency, the slower to complete so it will travel further in each cycle so you can see that waves of low frequency have long wavelengths and vice versa.
The frequencies of radio waves vary between a couple of hundred KHz (KHz = kilohertz = 1,000 hertz) right up to around 1,000 GHz (GHz = gigaHertz = 1 billion Hertz). When you are tuning your radio in to pick up a signal, that is in fact a frequency. These signals are put into groups and are called bands.