In　the　intrabody　communication　(IBC)　the　human　body　behaves　as　a　medium　that　connects　transmitter　and　receiver,　which　are　placed　directly　on　the　skin,　or　are　in　its　close　proximity.　The　signal　transmission　path　is　closed　through　the　human　body,　and　the　return　signal　path　is　closed　capacitively　through　the　environment.　Hence,　the　received　signal　level　is　affected　by　the　orientation　of　the　transmitter　with　respect　to　the　receiver,　the　number　of　ground　electrodes　connected　to　the　body,　the　size　of　the　receiver　ground　plane,　and　the　surrounding　environment.　Both　a　transmitter　and　a　receiver　have　a　signal　and　a　ground　electrode,　which　can　be　connected　to　the　human　body　in　two　ways:　predominantly　resistive　and　predominantly　capacitive.　In　a　predominantly　resistive　configuration,　signal　and　ground　electrodes　are　in　a　direct　contact　to　the　skin.　The　contact　is　obtained　using　standard　Ag/AgCl　electrodes,　placed　2　cm　apart.　In　a　predominantly　capacitive　configuration,　signal　electrode　is　connected　to　the　skin　using　standard　Ag/AgCl　electrode,　and　the　ground　electrode　is　a　bare　copper　electrode　placed　on　a　plastic　housing,　2　cm　above　the　signal　electrode.　In　this　paper　we　measured　transmission　characteristics　of　the　intrabody　communication　system　in　a　frequency　range　from　100　kHz　to　100　MHz　using　battery-powered　network　analyzer,　for　all　four　transmitterreceiver　electrode　configurations　(resistive-resistive,　capacitive-　resistive,　resistive-capacitive,　and　capacitive-capacitive),　at　five　different　distances　along　the　arms　(namely,　4　cm,　16　cm,　28　cm,　36　cm,　and　120　cm).　We　proved　that　intrabody　communication　channel　was　reciprocal.　The　highest　transmission　gain　was　measured　for　capacitive-capacitive　configuration,　regardless　of　the　distance　between　the　transmitter　and　receiver.　©　Springer　International　Publishing　Switzerland　2014.