The antenna is mechanically symmetric, but as I understand not electrically symmetric.
Is this an errror ?
www.fractusantennas.com/.../UM_FR01-S4-210.pdf
Chapter 5:
"Figure 7 shows the back and front views of the TRIO mXTENDTM chip antenna component
FR01-S4-210. Due to the product configuration, the feeding pad can only be the pad 1."