RF is the abbreviation for Radio Frequency. It is used to identify the actual frequency of transmitting devices. Radio stations, TV stations, two-way radios, cell phones, Bluetooth, and scores of other electronic devices emit a radio frequency. bugged.com Bug sweepers will identify the presence of RF in a target area, home, business, or vehicle to determine if the signal is authorized and known. If not, a bugged.com professional sweeping service company can use a real-time spectrum analyzer to identify the frequency and demodulate the signal to listen to the audio that is transmitted.