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If your RV already has a Winegard Sensar II or Sensar III roof antenna, the Sensar IV head is an affordable way to upgrade reception without replacing the whole lift assembly. It combines the Sensar antenna design with the Wingman UHF booster for a claimed range of up to 55 miles on VHF/UHF digital and HD channels.
Installation is straightforward since it attaches to your existing Sensar II or III base, so there's no need to cut into the roof or run new cable.
A practical way to boost over-the-air TV reception in the RV without swapping out the whole antenna system.