The RF channel is the actual or real channel that a transmitter sends out. Embedded within the TV signal is information such as time, program title, program information, and virtual channel. This embedded data is known as PSIP (Program and System Information Protocol). The channel number displayed on your TV will be the virtual channel number. During the digital transition period when TV stations broadcasted both analog and digital signals, the digital signal was on a different RF channel than the analog signal. For instance, in Minneapolis channel 11 broadcasted their digital signal on channel 35, but your TV would display channel 11.