Thats not a great sign, but also not always indicative that it wont work with an xSeries.
Just recently, I used my NExT on a Paradox reader, although a different model.
I used a slight downward motion to swipe, and “cut through” the antenna coil in a perpendicular motion
heres a quick video I took. (2nd video in the link)
The following is just a guess as to the antenna placement
but if you can get your hands on one to open up, or google fu some images, it may help
One “problem” you have is the proximity of the reader to wall that wil inhibit some hand placement options for you, OR it will turn you into a contortionist