Upgrade your existing Sensar III antenna for optimized over-the-air TV viewing with America's #1 selling RV HDTV Antenna! The 75 ohm Sensar antenna has built-in amplifier and unique circuitry that gives you clear VHF/UHF reception wherever you park your RV. Raise, lower and rotate the Sensar antenna from inside your parked RV. Receives all digital television broadcast channels. Replacement head only. Raise, lower, & rotate from inside a parked RV | Winegard Sensar IV Integrated Amp. Replacement Head Only