Hello, I read in the Ipod touch book this paragraph : " Ipod Touch contains radio transmitter and receivers. when on ipod touch can receive and send out radio frequency (RF) energy through its antenna. the antenna is located near the back upper left corner of Ipod touch...." I dont really understand what they mean by radio antenna ?! do I have a radio in my ipod touch ?! and if yes how can I use it ?! and if no.. canm someone tell me for what this radio antenna ?!