Indoor in line switching amplifiers, ideal for the distribution of DTT signals in the E02÷E48 range. They allow to reamplify the TV signals of a distribution line (e.g. to increase the number of users), but they can also be used as amplifiers of signals received by a multiband antenna. Suitable for single or small size TV systems. They have a single input and one or two outputs. The presence of a switch allows the enabling of the remote power supply.