RE: Radio Controler
If you are on 72 MHz and I am on 72 MHZ then we are on the same frequency band.
Within that band they sub divide it into channels. Today those are narrow band channels 11-60.
If you and I are on the same channel, then we both crash because our receivers can't tell which signals to follow.
Since your radio is wide band, it potentially spans several of the narrow band channels. That means you could bring down several planes at once. Not Good!
I hope that explains it.