Mast amplifier with 1 B.III input and 2 UHF inputs: the first with a channel elimination filter for 3 channels (passes the entire UHF band except the 3 selected channels) and the second with a channel pass filter for the 3 selected channels (only the 3 UHF channels eliminated in the other input pass). The amplifier is supplied already calibrated, and the filtered channels must be indicated at the time of order. This amplifier is an excellent solution for installations in areas where the Rai muxes come from a different direction compared to other signals, and the combined use of 2 UHF antennas can create interference. The product has the same basic characteristics as the “APG Series” amplifiers: die-cast mechanics with F connectors, low-noise signal regulators, 5G LTE filter, 30 dB gain with a 119 dBμV output level.