I learned the hard way that placement in what should logically be good spot doesn't necessarily work. Example is the antenna and tripod I bought in 2007, bolted it to the roof in a nice clear location. Turned out to be probably the worst location for multipath. Prior to 2009 when I could see the effects of multipath on the analog broadcasts, almost all were distorted and unwatchable, and digital didn't work either. Then I stuck an old RadioShack antenna my neighbor threw away in the attic out in the detached garage about 50 ft behind the house, just to have a TV out there, and lo and behold all channels came in with just a little bit if tweaking the position for K31GL and a few others to get pretty much all that are on the air. Ran a cable underground to the house, and that's the antenna in use today. Roof antenna serves as a bird perch.