Millimeter wave (mmWave) communications can provide high speed data rate for 5G wireless networks, taking advantage of the large bandwidth available at mmWave frequencies. It is also well known that mmWave links may suffer from outages due to non-line-of-sight (NLOS) propagation problems. In this paper, we study the characteristics of IEEE~802.11ad based mmWave systems at 60~GHz, and investigate the effect of passive reflectors for improving coverage. The experiments are performed using Tensorcom single chip TC60G-USB3-EVB and TC60G70100UP picocell platforms in different indoor and outdoor environments, both supporting beamforming based on IEEE~802.11ad specifications. Our results show that the passive metallic reflectors may signifciantly improve the mmWave signal coverage in regions where the line-of-sight (LOS) connectivity between the transmitter and the receiver is limited.