# Why is $Q$ factor an important quantity for electrical oscillations transmitting radio waves?

My textbook says that

"$$Q$$ factor is an especially important quantity for electrical ossicilations trasnmitting radio waves. When selecting radio and television stations it is essential that the transmitting and receiving circuits are tuned to the same resonance frequency"

However why must the two circuits tuned to the same resonance frequency? Also, how is Q factor related to the whole set up?

• If the two circuits were not tuned to the same frequency then you would not get the station or channel you want. Like the expression "tune your radio" – Aaron Stevens Oct 18 '18 at 15:08