  Blockage by the human hand/body is an important impairment in realizing
practical millimeter wave wireless systems. Prior works on blockage modeling
are either based on theoretical studies of double knife edge diffraction or its
modifications, high-frequency simulations of electromagnetic effects, or
measurements with experimental millimeter wave prototypes. While such studies
are useful, they do not capture the form-factor constraints of user equipments
(UEs). In this work, we study the impact of hand/body blockage with a UE at
$28$ GHz built on Qualcomm's millimeter wave modem, antenna modules and
beamforming solutions. We report five exhaustive and controlled studies with
different types of hand holdings/grips, antenna types, and with
directional/narrow beams. For both hard as well as loose hand grips, we report
considerably lower blockage loss estimates than prior works. Critical in
estimating the loss is the definition of a "region of interest" (RoI) around
the UE where the impact of the hand/body is seen. Towards this goal, we define
a RoI that includes the spatial area where significant energy is seen in either
the no blockage or blockage modes. Our studies show that significant spatial
area coverage improvement can be seen with loose hand grip due to hand
reflections.
