Do parabolic signal boosters work?

This is my first test with the Skyreat parabolic signal boosters. Did it help boost my signal any?

I plan on doing 3 or 4 more test with these signal boosters before giving a final verdict on them. Stay tuned. I am not knocking them or disclaiming they don't work, I am just showing my results. Maybe I did something wrong? I understand the trees work as obstacles, that is the purpose of me trying to find something to boost the signal! If you have any opinions of what I could do or try for better results please leave a comment below.

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Check my initial opinion or "un-boxing" of them here; http://www.crizzo.net/2016/06/skyreatparabolicantennaboosters.html