Optimized for the new DTV spectrum, the Sensar IV amplified replacement head combines the very powerful Sensar III antenna with the Wingman UHF booster for maximum VHF/UHF reception at an unsurpassed range of 55 miles. Enjoy all your favorite local programs in standard or crisp, clear HD while parked. Attaches to existing Sensar II or Sensar III lift assembly. Requires 46.25 inches length by 15.25 inches width, unobstructed roof space while stowed. U.S. Patent D620,483.