Hi folks

I've been having trouble with signal strength/quality on my HTPC. To be specific, I can't seem to get satellite signal quality greater than 54% and even when I am locked onto a transponder I can get irregular jitter (pixelation, audio discontinuities) even though the signal strength and quality appear stable. I have combined VHF/UHF from an aerial with satellite signals using a 9x8 multiswitch. At present I am simply connecting outputs from the multiswitch directly to STBs, VCRs, TVs and PC cards for whatever kind of reception the device supports.

Question: should I be reverse diplexing each multiswitch output before connecting it to a device?