The electromagnetic waves travell with the ligh-velocity: c=300000km/s.

We have this:

l=c/f, and: 

l--->Wave length(meters)
c--->Velocity of light 300000km/s=3000000000m/s
f--->Frequency(hertzs)

If we want to calculate the wave length for the frequency of 27.555MHz, we must do this:

f=27.555MHz=27555KHz=27555000Hz 
c=300000000m/s

l=c/f=300000000/27555000=10,8873162765378334240609689711486 metros

This number is aproximately 11, the "magic" number.

We can calculate the wave length of any frequency.

The wave length is very important.For example, if we see in a catalog an antenna of 5/8 l, this means that its physical dimension is about 5/8 the wave length.

If  l = 11 meters, the physical dimensions will be about (5/8)*11= 6.875 meters.
 

Umm.......These things are rotating to left...or to right???????