OK, stupid question, since we are on WA here...
Assuming that the Paducah HD locals (as well as some recent others) go on EA 77, what about all of the other SD local channels in these DMA's (like PBS's, CW's etc) that are in SD only, but already up on 110 or 119? Does E* put up duplicate MPEG 4 SD copies of these stations up on EA as well? I assumed so, since E* already got in trouble before with having SD locals spread across multiple dishes before, not to mention subs NOT getting at least PBS in SD isn't going to go over too well.
Yep, that's what they usually do, they do not duplicate the HD ones in SD since all the equipment on EA is HD capable.