You can't see the signal level with the factory installed Winegard signal booster. It's either off or on. turning the antenna won't give you any change in "reading" since there's only a green LED.
Winegard does make a replacement signal booster that has a digital signal strength meter in it. This booster is a direct replacement for the original one. Unscrew the two screws, remove the old one, disconnect the coax leads and the 12 VDC wires, reconnect them to the new one and slip it in the existing space, reinstall the 2 screws and you're done. You an see this new one at the following CW site:
http://www.campingworld.com/shopping...al-meter/55642
I have not purchased one of these (yet) so I can't offer any suggestions on whether or not it helps. Just giving you an answer to how you can measure your signal strength. Hope it helps.
Our current solution is, if in a campground to check where most of the other antennas on campers are pointing and start there. If we're in the "boonies" I aim the antenna toward the nearest big town and adjust from there.