An amplifier operation was not necessary for inserting the 75-ohm characteristic impedance cable, all available terrestrial DVB-T transmitters were well receivable (via an antenna extension cable on the window). Plugging the 230V power plugs did not yield any visually perceptible improve reception. The antenna was adequate even as a passive version and well. A change of the gain adjustment potentiometer in amplifier operation brought no better picture and could not be assessed from the aforementioned reasons.
