[en] Proper optimization of antenna parameters can lead to high efficiency (Rn₂₀I/P > or approx. 3) kinetic-Alfven-wave current drive in plasmas with elongated cross sections. The optimal parameters include (i) finite, non-zero azimuthal wave number m = 1, (ii) large toroidal wave number n = 5-8, (iii) an antenna array consisting of a least n elements with adjacent elements phased π/2 apart, (iv) Faraday shielding, and (v) plasma cross section elongation s > 1.5, which together with the finite β, helps in moderating the trapped-particle effects by locating the resonance close to the plasma axis. (orig.)