If you diplex your OTA with your DTV, picking the right diplexer can and will make a huge difference. I was using the Phillips diplexers and and was missing a number of channels. Based upon reading in the Cutting Edge Forum, I replaced them with the Channel Master 4002IFD to combine and the Channel Master 4001IFD to split. Holy Cow!!! What a difference. I got channels I was not getting before and the ones i had been getting are seeing dramatic increases in the signal meters. I was getting pixelation on one VHF channel here in Cincinnati and now. No pixelation at all. BTW, these are not expensive diplexers At www.solidsignal.com the 4001 is ~$7 and the 4002 is ~#12 Best 19 bucks i've spent in a long time.