exactly the right device

The device fulfills precisely its purpose. I previously had a normal antenna coupling. Without additional power or the like.
Unfortunately I could not operate simultaneously 2 devices (Kabelweg 5m) so that, as the disturbances were just too big.
With this device, now everything works great. The signal strength is even increased by about 20-25%. Even if both devices are turned on. The picture error rate is however increased from 0-1% to 5-10%. I see but still no artifacts or similar. Probably moves yet in the corresponding tolerance range.
The device is actually exactly the same product as of Hama. The case and the specifications are completely identical. Only the label is just another.
Conclusion: I should have me save this coupling and the same as to buy a unit.