ANTOP 50 Miles Amplified Indoor HDTV Antenna with Inline Amplifier Multi-directional Reception Curved-Panel and Built-in 4G LTE Filter, 10ft Cable AT-211B Free TV for life no monthly bill for watching TV at-211b hdtv antenna receives free broadcast high definition over-to-air (ota) Engineered and designed in the USA by ANTOP, the antenna specialists, the ANTOP curved-panel at-211b over-the-air digital TV antenna The smart pass amplifier, an exclusive technology offered only by ANTOP Antenna effectiveness is influenced by the distance from signal origination point, station signal strength level, building construction