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This study is focused on the field programmable gate array (FPGA) implementation of a reconfigurable fast Fourier transform (FFT) operator able to provide Fourier transforms both over infinite complex field C and Galois finite field GF. This reconfigurable FFT exploits to a great advantage the possibility to share hardware resources when considering multi-standard scenario for software radio systems. A reconfigurable FFT of length N=256 has been implemented on FPGA/STRATIX II. It achieves a performance-to-cost ratio gain from 24% to 9.4% compared to the basic duplicated solution for which no reconfiguration is considered.