You may find an antenna working very well in some places while the same antenna may not work fine your case. It is because of the fact that the signal received by the antenna depends on various factors.
Not only the broadcasting signal strength and signal receiving capability of the antenna affects your HDTV quality but also the beam area, directivity, antenna height, antenna angle, interferences and obstructions plays key role.
Now as you know that same antenna that may works excellent at one place may not work at others. Thus it becomes necessary to check which antenna will work better for you.
I will better recommend you to go through any of these websites to choose best suitable model for your area- TVFool.com, antennaweb.org, antennapoint.com, FCC’s