K9sat - I don't think we are really disagreeing. The three main delivery mechanisms for the off-air stations are OTA (as we both agree, the most common), copper and fiber. You posted that fiber was not used but then you reversed that by saying fiber was RARELY used, used only where distance made it cost-effective and I am sure that's the case.
It's good to see a posting from someone who actually understands how all this works.
broe67 - other than being center-cut from the HD channel (which has its own issues) the "SD signal" could be pretty good quality, but DirecTV actually deliberately reduces the resolution so as to get more SD channels on each transponder.
I think your comments on FIOS are incorrect though. FIOS is the only provider that delivers HD locals in their full OTA resolution (in MPEG2) and you can't do better than that.