(1) No coordinate system is drawn on any figure. The
relationship between the XYZ system mentioned in the
text and the Theta, Phi system mentioned in the figures
is not known.

(2) The polarization is stated as linear, but its
direction is not presented anywhere in the paper.

(3) GPS requires circular polarization with reasonably
small ellipticity to fight multipath that corrupts GPS
accuracy. Linear polarization introduces deep fading
leading to signal loss. Therefore the proposed antenna
is not suitable for GPS.

(4) The bottom half of figures 5, 6, and 7 shows an
almost constant radiation at full signal strength (0dB).
This is totally unrealistic. The effects of the substrate
size are not visible in the radiation patterns. 
