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Probing magnetic fields in astrophysical environments is both important andchallenging. The Gradient Technique (GT) is a new tool for tracing magneticfields, rooted in the properties of magnetohydrodynamic (MHD) turbulence andturbulent magnetic reconnection. In this work, we examine the performance of GTwhen applied to synthetic synchrotron emission and spectroscopic data obtainedfrom sub-Alfv\'enic and trans-Alfv\'enic MHD simulations. We demonstrate theimproved accuracy of GT in tracing magnetic fields in the absence oflow-spatial frequencies. Additionally, we apply a low-spatial frequency filterto a diffuse neutral hydrogen region selected from the GALFA-\ion{H}{1} survey.Our results show an increased alignment between the magnetic fields inferredfrom GT and the Planck 353 GHz polarization measurements.

Tracing Magnetic Fields with the Gradient Technique: Spatial Filtering Effect and Use of Interferometers