The HD antenna is the most popular over-the-air RV TV antenna in America! Built-in amplifier and unique circuitry provides clear VHF/UHF reception whenever you park your RV. Raise, lower and rotate the antenna with hand crank from inside your RV. It´s easy to install and lowers to only four inches above the roof while traveling. Antenna 24-2110 includes amplified antenna and lift assembly, +12 VDC white power supply with on/off switch, white interior control parts, no power supply or cable.