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Formulas for determination of coefficients of mutual admittance's matrix of finite antenna array, composed of open-ended axisymmetrical disk-o-cone radiating elements, with taking into account T-mode have been obtained. Graphs of dependencies of mutual couplings between H₁₁ modes in the neighbour apertures as a functions of external diameters of radiating elements for various external to internal diameter ratios, as well as distances between elements, are presented. Comparison of measured radiation patterns of a designed single disc-o-cone element and 9-elements phased antenna array, composed of the elements is made. Results of theoretical investigations of 7-elements cluster, composed of the coaxial disk-o-cone elements are also given.