It might be an occasional broadcaster. I'm not near my dish, but it may also be one of the channels that shows a card most of the time. I'm pretty sure it's mostly erratic feeds.
Also, remember that AMC1 is a screwy bird, and the skew if off about 20 degrees to the right. If you don't skew the LNB right, you'll likely just get a few feeds and Pentegon at a rather low level.