The unit has movable or fixed antenna branch lines with socket outlets at their ends. A plug-in unit n3) with a distance supplied wideband amplifier (12) for noise level reduction is directly connected to an antenna socket outler (2). It has at least one output socket (7), and a mains connection unit (5) plugged into a mains socket outlet (4) at some distance from it. The connection unit (5) has a power supply unit (18) connected to a coaxial power supply cable (20) connecting for h.f. the two units (3, 5) and applying the h.f. signals to the antenna socket outlet (17). The branching off unit (3) has an antenna outlet (11) connected to the antenna either directly or through the amplifier (12).
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