I live in East Plano,TX and I use a VHF and a UHF antenna in the attic. I have both antennas on a single mast and also use a rotator. First, I just tuned my DTC-100 to the digital channel 20 and got no signal indication. Assuming that the Channel 12 and Channel 20 transmit antennas are on the same tower, I tuned my TV to channel 12 and rotated the antenna for best reception of channel 12. The best I could get on channel 12 was sound and a very, very poor picture. This analog signal was not really watchable at all. I switched back to channel 20 on the DTC-100, and got wonderful reception! The signal level was steady, in the high 50's, comparable to the signals I receive on channels 14, and 18! Last friday I watched the whole hour of HD "First Monday" on KXII-DT. I observed 3 very short (fraction of a second) dropouts during the hour (one during a commercial).
I don't know what power levels KXII is using on their analog and digital channels but I receive a useless analog signal and a perfectly watchable digital signal! Distance is >60 miles too!