An electrophysiology catheter (58; 72), comprising: an elongate, deformable shaft comprising a proximal end and a distal end; and, a basket electrode assembly (60; 74) coupled to the distal end of the shaft, the basket electrode assembly (60; 74) comprising a proximal end and a distal end and configured to assume a compressed state and an expanded state, the basket electrode assembly (60; 74) including: a plurality of first splines (62; 76), each first spline (62; 76) having a tubular body and comprising an electrode disposed thereon, and a plurality of second splines (64; 78), each second spline (64; 78) having a tubular body and comprising an electrode disposed thereon, wherein the plurality of first splines (62; 76) forming a first basket with a first maximum radius, relative to a central longitudinal axis in the expanded state, the first basket comprising a first plurality of electrodes, and wherein the plurality of second splines (64; 78) forming a second basket with a second maximum radius, relative to the central longitudinal axis in the expanded state, wherein the second maximum radius is different than the first maximum radius, wherein the first basket and the second basket are each centered on the central longitudinal axis, wherein an electrode on one of the plurality of first splines is positioned within an envelope defined by the plurality of second splines (64; 78) when the basket electrode assembly (60; 74) is in the expanded state, wherein each of the plurality of first splines (62; 76) and each of the plurality of second splines (64; 78) are coupled to the distal end of the shaft and coupled together at the distal end of the basket electrode assembly (60; 74) and wherein each of the plurality of first splines and each of the plurality of second splines are biased by a wire extending through a lumen of the tubular bodies of said splines for assuming a predetermined shape. an elongate, deformable shaft comprising a proximal end and a distal end; and, a basket electrode assembly (60; 74) coupled to the distal end of the shaft, the basket electrode assembly (60; 74) comprising a proximal end and a distal end and configured to assume a compressed state and an expanded state, the basket electrode assembly (60; 74) including: a plurality of first splines (62; 76), each first spline (62; 76) having a tubular body and comprising an electrode disposed thereon, and a plurality of second splines (64; 78), each second spline (64; 78) having a tubular body and comprising an electrode disposed thereon, a plurality of first splines (62; 76), each first spline (62; 76) having a tubular body and comprising an electrode disposed thereon, and a plurality of second splines (64; 78), each second spline (64; 78) having a tubular body and comprising an electrode disposed thereon, wherein the plurality of first splines (62; 76) forming a first basket with a first maximum radius, relative to a central longitudinal axis in the expanded state, the first basket comprising a first plurality of electrodes, and wherein the plurality of second splines (64; 78) forming a second basket with a second maximum radius, relative to the central longitudinal axis in the expanded state, wherein the second maximum radius is different than the first maximum radius, wherein the first basket and the second basket are each centered on the central longitudinal axis, wherein an electrode on one of the plurality of first splines is positioned within an envelope defined by the plurality of second splines (64; 78) when the basket electrode assembly (60; 74) is in the expanded state, wherein each of the plurality of first splines (62; 76) and each of the plurality of second splines (64; 78) are coupled to the distal end of the shaft and coupled together at the distal end of the basket electrode assembly (60; 74) and wherein each of the plurality of first splines and each of the plurality of second splines are biased by a wire extending through a lumen of the tubular bodies of said splines for assuming a predetermined shape.