The switch makes perfect what he should. Unfortunately, he attenuates DTT signals on the master very strong and a little less on the slave. With sensitive receivers as my Samsung TV no problem but at cheaper tuners. The frequency range of states as well as the DVB-T is not allowed to pass. This issue into perspective as soon as a switching voltage on the SAT Master is created. Then I again a 100% signal level in DVB-T. Anyone wishing to use DVB-T should connect the switch rather to the antenna socket on the SAT output! Otherwise a perfect part!