A system for intra-body treatment, comprising: a multi-point probe for transport by a catheter to a lumen of a body of a treated patient, the multi point probe having at least two transmission points, wherein the multi point probe includes a plurality of receiving points for intercepting energy delivered from the at least two transmission points via the treatment location; means for measuring radio frequency energy intercepted by the plurality of receiving points and delivered from the at least two transmission points via the treatment location; and a processor configured to select a transmission pattern according to said intercepted radio frequency energy as measured, the transmission pattern including for each of the at least two transmission points a respective signal of a plurality of radio frequency transmission signals, wherein, when transmitted from the at least two transmission points, the respective signals interact to cause at least one hot spot at the treatment location; and control delivery of the respective selected radio frequency transmission signals from the radio frequency transmission points, wherein controlling the delivery comprises detecting changes in a dielectric property of the treatment location or of data received by a receiving point and making an adjustment of said delivery according to the detecting. a multi-point probe for transport by a catheter to a lumen of a body of a treated patient, the multi point probe having at least two transmission points, wherein the multi point probe includes a plurality of receiving points for intercepting energy delivered from the at least two transmission points via the treatment location; means for measuring radio frequency energy intercepted by the plurality of receiving points and delivered from the at least two transmission points via the treatment location; and a processor configured to select a transmission pattern according to said intercepted radio frequency energy as measured, the transmission pattern including for each of the at least two transmission points a respective signal of a plurality of radio frequency transmission signals, wherein, when transmitted from the at least two transmission points, the respective signals interact to cause at least one hot spot at the treatment location; and control delivery of the respective selected radio frequency transmission signals from the radio frequency transmission points, wherein controlling the delivery comprises detecting changes in a dielectric property of the treatment location or of data received by a receiving point and making an adjustment of said delivery according to the detecting. select a transmission pattern according to said intercepted radio frequency energy as measured, the transmission pattern including for each of the at least two transmission points a respective signal of a plurality of radio frequency transmission signals, wherein, when transmitted from the at least two transmission points, the respective signals interact to cause at least one hot spot at the treatment location; and control delivery of the respective selected radio frequency transmission signals from the radio frequency transmission points, wherein controlling the delivery comprises detecting changes in a dielectric property of the treatment location or of data received by a receiving point and making an adjustment of said delivery according to the detecting.