I have a SlingBox Pro HD connected via coax input from a cable company-installed splitter. The other side of the splitter connects to a QAM tuner LCD TV. The HD has never found about 90% of available QAM channels above 13, while the TV picks up all available QAM channels. I have reset the HD and rescanned the coax input, and still almost no >#13 QAM channels are found. The HD does find about a half-dozen xxx.1 channels with no visible content. I have swapped the splitter outputs with no joy. Any ideas?