Hate to disagree with you Bruce but the sat side of the diplexer is a DC path and therefore works identically in either direction. Also, most boxes use a phone line for ppv etc. I've heard that some use the same co-ax, but have yet to see it. No phone line? Just use an ac wireless jack, works great. The balun solution also works just fine, requires a transformer for either end of the utp, available from ADI etc. I prefer channel plus diplexers.