Increasing signal-to-noise-ratio (SNR) in prostate MRI could facilitate the diagnosis and characterization of prostate cancers. In this work, we built a quadrature posterior surface array that aims to increase local SNR at the prostate. The coil was compared to 3 and 9 channels of the standard spine array using phantom measurements. Respectively, SNR gains of 12 and 9% were obtained using a realistic region-of-interest (ROI). Further work will be undertaken to translate the SNR gains to in-vivo prostate imaging at 3T.