The authors present the design and realisation of balanced antipodal tapered slot antenna (BATSA) with frequency notched ultra-wideband impedance characteristics, very high gain and extremely low cross-polarised radiation. The proposed antenna comprises a central elliptic conductor sandwiched between two elliptic conductors etched on two dielectric substrates both of which acts as the ground planes and thereby provide an electromagnetic balance for the radiating electric field. The proposed BATSA is fed by a microstrip line. The microstrip section is followed by the radiating flared section of the antenna. The notch frequency is achieved by introducing a quarter wavelength spur line in the feeding microstrip line of the antenna. The fabricated prototype of the antenna was characterised for impedance and radiation performance revealing a very good correspondence with simulation results. Radiation pattern characterisation confirms high gain in the end-fire direction and very low cross-polarisation compared to antipodal tapered slot antenna.