RCA-brand digital signal preamplifiers are designed specifically to improve the performance of outdoor antennas in low signal strength areas, extending antenna range to give you the most channels and best reception possible. Our preamplifiers are engineered for digital signal, so they outperform old preamps made for analog. Features Extends range for outdoor antennas Enhances performance in low signal strength areas Preserves signal purity with extremely low-noise (ELN) circuitry Outperforms old preamplifiers made for analog signals Optimizes performance with separate UHF/VHF amplification Switchable FM trap to prevent interference from FM signals