An electronic device may include a PCB having a substantially planar surface and one or more electronic components mounted thereon. A first EHF communication unit may be mounted on the substantially planar surface of the PCB. The first EHF communication unit may include a first planar die containing a first communication circuit, the first die extending along the substantially planar surface of the PCB in a die plane. A first antenna may be operatively connected to the first circuit by interconnecting conductors, the first antenna being configured to at least one of transmit and receive electromagnetic radiation along a plane of the substantially planar surface of the PCB. The first EHF communication unit may have an uppermost surface having a height from the substantially planar surface of the PCB, the first EHF communication unit height being determined by an uppermost surface of the die, the first antenna, and the interconnecting conductors.