There are two different concepts of radio waves behavior which are given below such as Gain, Loss.
Here are some simple concepts that are necessary to your understanding of RF and hence your ability to design, installs, and administers your wireless network. You need to understand the concept of gain, loss, reflection, refraction, diffraction, scattering, absorption, and free space loss.
Gain
Gain describes an increase in a radio frequency signal’s amplitude. Usually, gain is an active process. This means that you can use an external power source (such as an antenna) to amplify a signal, or you can use a high-gain antenna to focus the beam width of a signal to increase its amplitude.
![[Valid RSS]](http://validator.w3.org/feed/images/valid-rss.png "Validate my RSS feed")