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This letter aims to investigate the optimum locations for ultrawideband (UWB) nodes placement on the body for reliable and power-efficient body-centric wireless communications. System-level modeling is analytically and numerically performed on the basis of multiband orthogonal frequency division multiplexed (MB-OFDM) system. System performance is evaluated for different parts of the body based on real-time measurements. Results and analyses, based on signal-to-noise ratio (SNR) and bit error rate (BER), demonstrated that BER is less than or equal to 0.1% for 96.43% of lower-body locations (for on-body communications) and 83.68% of the human trunk ones (for off-body communications), respectively, with low power requirements.