I am in the number 19 dma, and I can tell you for a fact that not all the stations are full power, only 3 of them are, the others cannot go full power becuase they are transmitting digital on a channel that has analog in the adjacent dma
I am in the Sacramento DMA, now, I am at the very south end of it.. Example, PBS DT is on channel 53 and there MyNet TV analog in fresno is on 53, that poses a problem as I am right in the middle of the two markets, only slightly closer to sac, but I turn around my antenna, and I can get most of the fresno stations.. but still there are some I can't get because of the analog channel in the sac market.. it sucks, but untill the digital changeover, there are some stations that have no choice but to transmit limited power.. so in cases like mine, directional antenna's are a must.