This disclosure is directed to a catheter having a dual multiray electrode assembly at the distal end of the catheter body formed from a plurality of spines with electrodes and a dual multiray electrode assembly at the distal end of the catheter body. The dual multiray electrode assembly may have a proximal multiray array and a distal multiray array, each array comprising a plurality of spines connected at one end. The dual multiray electrode assembly may have an expanded configuration and a collapsed configuration wherein the spines are arranged generally along a longitudinal axis of the catheter body.
