A communication system, comprising: a first medical device including a first antenna having at least two electrodes (312, 314); and a second medical device (320, 600, 700) including a second antenna having at least three electrodes (322, 324, 326, 610, 620, 630, 710, 720, 730, 740); wherein at least one of the first medical device and the second medical device (320, 600, 700) is configured to: test communication vectors between the at least two electrodes (312, 314) of the first medical device antenna and at least two pairs of the at least three electrodes (322, 324, 326, 610, 620, 630, 710, 720, 730, 740) of the second medical device antenna; select a communication vector from the tested communication vectors; and at least one of send and receive a conducted communication along the selected communication vector; monitor a measure related to a signal to noise ratio of the selected communication vector; if the measure related to the signal to noise ratio of the selected communication vector falls below a threshold, then: automatically select a different communication vector; and send the conducted communication signal through the automatically selected different communication vector; and wherein the communication vectors represent different combinations of electrodes for communication between the first medical device and second medical device (320, 600, 700). a first medical device including a first antenna having at least two electrodes (312, 314); and a second medical device (320, 600, 700) including a second antenna having at least three electrodes (322, 324, 326, 610, 620, 630, 710, 720, 730, 740); wherein at least one of the first medical device and the second medical device (320, 600, 700) is configured to: test communication vectors between the at least two electrodes (312, 314) of the first medical device antenna and at least two pairs of the at least three electrodes (322, 324, 326, 610, 620, 630, 710, 720, 730, 740) of the second medical device antenna; select a communication vector from the tested communication vectors; and at least one of send and receive a conducted communication along the selected communication vector; monitor a measure related to a signal to noise ratio of the selected communication vector; if the measure related to the signal to noise ratio of the selected communication vector falls below a threshold, then: automatically select a different communication vector; and send the conducted communication signal through the automatically selected different communication vector; and test communication vectors between the at least two electrodes (312, 314) of the first medical device antenna and at least two pairs of the at least three electrodes (322, 324, 326, 610, 620, 630, 710, 720, 730, 740) of the second medical device antenna; select a communication vector from the tested communication vectors; and at least one of send and receive a conducted communication along the selected communication vector; monitor a measure related to a signal to noise ratio of the selected communication vector; if the measure related to the signal to noise ratio of the selected communication vector falls below a threshold, then: automatically select a different communication vector; and send the conducted communication signal through the automatically selected different communication vector; and automatically select a different communication vector; and send the conducted communication signal through the automatically selected different communication vector; and wherein the communication vectors represent different combinations of electrodes for communication between the first medical device and second medical device (320, 600, 700).