Channel 7-1 good... for an hour

On Monday night I started watching Boston Legal on Channel 7-0 (analog), unwilling to mess around with the antenna setup. I had the Philips SCP020 antenna almost exactly the way it came out the box, with its 'ears' folded and tucked in over the loop, but connected to the TV. During the opening credits, I decided to arrow up to 7-1 just to confirm it would just be a blank screen, but to my pleasant surprise, it was the show, in a crisp, clear digital presentation, without all the random dropouts that had plagued the channel last month. The antenna was in the same folded position with which I can watch Channels 4-1 and 4-2. So I watched the rest of Boston Legal on 7-1. But yesterday, Election Day, I couldn't get 7-1 to come in at all. For the most part I watched NBC's coverage on 4-1 and a little bit of CBS on 62-1. I was curious about ABC, so I very briefly tuned in to 7-0 a couple of times. But 7-1 would just not come in at all for me yesterday.