BU433D1, UHF booster, DX Antenna, Antenna parts, TV, terrestrial digital, antenna, Booster, Maspro, New, unused, Opened for photo posting This item has been handled by a person once. Please purchase only if you understand this. I will report on packing and shipping with photos each time via transaction messages (To avoid future troubles) Thank you very much. Even if you are unsure about the reception environment, from strong to weak electric fields, you can rest assured with this one unit. This is a dual booster that amplifies UHF, allowing you to switch between 33dB and 43dB with a single switch. It is used to strengthen the radio waves when the TV signal is weak or when it is necessary to send the TV signal to multiple TVs. It is small, so it can be mounted on a horizontal mast. Amplification band/gain: UHF 43dB (33dB). JEITA DH710 mark certified. For outdoor use.