We had a change of heating systems from analog signal to a DVB-C installation. My Sony Bravia KDL-52HX905 with an integrated DVB-C tuner able to receive all digital channels. Only with the HD channels were partially misfires - except I have staked all other devices, the HD channels functioned well.
On 2 DVB-C (a Samsung TV monitor) were ever found No digital channels.
The 2 analog devices were even worse picture than before.
The statement of the technician of the company that installed the system was only: "The system is so designed only for 1 unit per household" (???)
I have then ordered the HAMA amplifier and to be sure new coaxial plugs for the cables.
Plug mounted - connected and all stations on all devices, exactly as it should be (including HD.) - And I do not even have to adjust the regulator.
Four stars because 1, however, are a bit too expensive for a simple 10dB amplifier and 2. the individual ports are not regulated separately.