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This does happen time to time with certain antenna's, in fact this model while has some good reviews it also has some bad which explain the same problem. You can view them here: http://www.amazon.com/Mohu-Curve-Designer-HDTV-Antenna/product-reviews/B00F3ZO6HU/ref=cm_cr_dp_qt_hist_one?ie=UTF8&filterBy=addOneStar&showViewpoints=0
As a test try holding the antenna and or placing it on something outside of a window/home and see if it is better then which could happen due to construction of home and interference.
Make sure the power is supplied to the unit so that it is amplified.
Note users reviews that state other antenna's provided more channels for them than what this model did, this has to do with many factors which change per user depending on their home, things in the home and location as well as some other things that can effect the signal.
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