"Wireless" refers to equipment that transmits its signal via radio frequencies. A wireless video camera will be connected via a short lead to a transmitter which then sends the signal on a radio frequency to a receiver set to the same frequency. The advantage of a "wireless" system centers on its ease of setup. Long cable runs are eliminated allowing for quick, inexpensive and covert installations. The disadvantage of a "wireless" system is its susceptibility to interference problems. The video signal is no longer on a dedicated run but rather is sharing a frequency. This can lead to signal problems where the video quality diminishes somewhat.