I currently have voom installed and am running 4 diplexers (old terk ones) with no problems. A friend was having problems with starz 261 and 262, he was getting bravohd on one i remember. So I told him he could have one of the diplexers voom left with the POS stealth antenna they left here in the box. I installed a superior antenna previoulsy when I had D*. I unpacked both diplexers and tried them in my spare bedroom. Both are F'd up! and recreated the exact problems he cited. DO yourself a favor, save the wait and the service call and stop by radio shack and pick up your own diplexer. Mine are tiny ones left over from a terk antenna I threw away. They work fine. Apparently many of the channel master diplexers are just faulty
