Hassanieh etc. proposed a prototype based on Sparse Fourier Transform(SFT) for wide band spectrum sensing and decoding in real-time. BigBand uses three standard low-speed Analog to Digital Converters(ADCs) to resolve the aliased spectrum in which at most two signals collide. In this paper, a design is put forward by using a multi-channel low-speed acquisition card to sense and decode wideband spectrum based on BigBand. An experimental implementation is presented for this design. Experimental results show that a 4-channel BigBand can resolve the aliasing of three frequencies.