Hi, I have the same TV Stick - in my case it is excellent, but I did have a bit of experimenting to do in order to get it as it is now. The critical thing is in fact the position of the little black box, not only the aerial. I use my main tv aerial, but even with that the position of the box itself is what you need to adjust in order to get the best results -
as I have said, I am glad I persevered as I do
enjoy great reception on my PC.
Good luck with yours.