In this letter a 3D printed compact UWB extended gap ridge horn (EGRH) antenna designed to be used for biological measurements of the human body is described. The operational frequency covers the microwave band of interest from 0.5 to 3.0 GHz (for a S11 under -7dB). The 3D printed EGRH antenna is dielectrically matched to the permittivity of the human body and because of its compactness it can be visualized as a general purpose microwave probe among the RF biomedical community. The probe has proven its capability as a pass-through propagation sensor for different parts of the human body and as a sensor detecting a 1 cm diameter object placed inside an artificial head phantom.

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