A method for calculating connectivity of a space having a number of objects using a computer system includes establishing a character matrix having a number of elements in accordance with the objects. The invention relays on the comparison of diffuse reflectance andor fluorescence spectra, of painting material models of known composition, with the intensities emitted and captured at the same wavelengths and for any spatial point of the art-object of unknown composition. The antenna, in this aspect, further includes a loop antenna element having a first loop antenna element end and a second loop antenna element end, wherein the first loop antenna element end is coupled to the second feed element end and the second loop antenna element end is configured to electrically connect to a negative terminal of the transmission line.