arXiv:2610.41567v1 Announce Type: new Abstract: Pinching antenna (PA) systems offer flexible antenna configurations for future wireless communications, yet how PA geometry, orientation, and position affect channel characteristics in practical environments remains insufficiently studied. To address this gap, this paper first presents an indoor PA system channel measurement campaign at 59.5~GHz. A dedicated time-domain channel sounder is developed with frequency conversion and a circular-waveguide-to-dielectric-waveguide transition to feed the radio frequency (RF) signal into a flexible dielectric waveguide. Using this platform, office measurements quantify channel attenuation and channel characteristics by examining four PA geometries, arc PA orientation, circle PA pinching position, and transmitter--receiver height difference. The channel measurement data are analyzed in terms of path loss, shadow fading, root-mean-square (RMS) delay spread, Rician K-factor, normalized capacity, and spatial similarity. Indoor path loss models for PA systems are fitted for each PA geometry. The results reveal geometry-dependent attenuation and shadow-fading variability, with the arc PA showing greater variability than the circle PA. Arc PA rotation shifts the delay spread and conditional K-factor distributions. Moving the circle PA produces nonmonotonic changes in delay spread and normalized capacity, while spatial similarity remains relatively high at many receiver locations as the pinching position changes. These observations provide an empirical basis for PA systems channel model and system design.