Multiplexers for masts. They mix the signal from several antennas to a single output.

MM-208 VHF & UHF input

40-260 MHz & 470-862 MHz

MM-303 FM & BIII & UHF input

88-108 & 160-260 & 470-862MHz

MM-307 VHF & UHF1 & UHF2 input

10-260 & 470-862 & 470-862 MHz