Your antenna has to point at their antenna. In my case, I can actually see the lights flashing on the antennas. The colored lines show the direction and the length of the line shows the relative strength. Since there are multiple antennas you have to find something in the middle that works for all of them.
DO NOT get wadded up about using a compass. Just point a little east of South and work your way east. Where the beamwidth of a satellite dish is maybe 1 degree, the beamwidth of the Winegard is closer to 27 degrees IIRC.
