I don't know a better explaination, not that it's causing much trouble since i can still get a signal, but my UHF roof antenna used to stay still in one spot (facing my home's north end) and i could get all channels on that side fine. now it appears that WTVW Fox 28.1, WEVV CBS/My44, and WFIE NBC/Weather/THIS TV have 'moved around' that is no signal from where it has been for a long time since the transition, and i have to move the antenna 45* from where it used to be and i then get the same excellent reception, then a day or two later, i have to move it to the south end of my home, then back to north, then somewhere else. what's going on? are the stations 'moving' and if not, why do i have to reposition the antenna when no weather or other things are happening to get a signal? no wind, rain, or snow. just 'phantom' transmitters or something.