SOME TVs have a "signal strength meter" on the CHANNEL SCAN menu that will provide a bar graph of the signal strength as you turn the antenna. Turn until the bar's the biggest... With Digital Antennas, the EXACT angle isn't all THAT critical (unlike satellite where 3D angles are pretty critical to "hook up" with the satellites).
Highlands Ranch, CO
2015 Seneca 37TS ("Screaming Eagle")
2009 Hummer H3 ("Ranger")
2005 Chevy 2500HD ("Max")
2008 MasterCraft X-15 ("One More Time")