2.4GHz antenna feed routed through pcb via?
There are many similar questions here, such as Should there be more clearance on RF vias with microstrip?, and Calculating Signal Loss (dB) Through Vias, and How to minimize characteristic impedance mismatches caused by vias?

Essentially, they all say to either calculate the effects by hand, or try a 3D EM field solver to simulate the physical performance. OpenEMS &amp; Octave are free for Linux, and are very powerful.