The ICU Satellite/Radio Antenna Box is used when the ICU Car Camera® is installed in place of a “Shark Fin” factory roof antenna. If you have a shark fin antenna and would like to use the same installation hole for an ICU Car Camera® such as the Phantom ICU Car Camera, you will need to move it somewhere to a new location. This is the perfect solution because it allows you to insert your antenna inside the Antenna Box (after removing it from the shark fin shell) and mount it to the rear window with the supplied “sticky mounts”. You can re-route the antenna cable cable from the prior location of the antenna to the new location. Sizes of antennas will vary, Three sizes are available for small, medium, and large size shark fin antennas.