I've not had much luck with antennas as part of my Home Theater PC build. Up until now, none of the models I've tried have worked very well. This latest one, a Channel Master 4228, did not fare well inside my attic, so I finally had to admit defeat and mount the thing on my roof. So far so good. The overall signal strength doesn't seem any higher on the meter, but I haven't noticed any dropped signals or pixelation either, and, most importantly, we seem to finally have a strong and stable PBS signal.
The rooftop mount is an expensive option, even when you do the install yourself. The antenna, mast, cable and various connectors, along with grounding hardware, totals somewhere around $200. So if you can get a signal with one of the other options, I would recommend you try them first.