In a portable radio communication apparatus including a housing, at least
one part of the housing is formed as a housing electrical conductor
portion by an electrically conductive material. The housing electrical
conductor portion is connected with a radio communication circuit of the
portable radio communication apparatus so as to operate as at least one
part of an unbalanced type antenna of the radio communication circuit.
Further, the portable radio communication apparatus further includes a
boom portion coupled with the housing at least at two positions so as to
provide at least one penetrating hole between the housing and the boom
portion.