Same cable - two decoders - different polarization

[schumacher]

Hi there, I have prewired house one cable pass through all the house. I bought two dishes (different service providers) both uses the same sattelite but different polarization (one vertical, the other horizontal). I tried to splitt the signal from the cable to the dishes using the powerpass splitter the result: When I plug the cable in both dishes I lost the signal in one of them. How can I split the signal for both? The cable works good if I connect one at a time