an electrode referring initially to fig1 ablation device 10 includes an antenna 12 and a handle portion 13 antenna 12 includes a shaft or feedline 14 having an inner conductor 16 and an outer conductor 20 which defines a longitudinal axis x x outer conductor 20 may be for example an introducing structure e g needle configured to pierce and or penetrate tissue ablation device 10 is connected by a cable 21 e g coaxial cable to a connector 15 that in turn operably connects ablation device 10 to a suitable electrosurgical generator 22 see fig2 a and 5 additionally an actuation element 7 is illustrated in fig1 in accordance with various embodiments of the present disclosure actuation element 7 is operably coupled to inner conductor 16 and movable along a track 9 disposed longitudinally along at least a portion of the length of handle portion 13 to move inner conductor 16 along longitudinal axis x x relative to outer conductor 20 more specifically distal and proximal actuation of actuation element 7 along track 9 moves inner conductor 16 distally and proximally along longitudinal axis x x respectively relative to outer conductor 20 actuation element 7 may be for example a slide button a ring a lever or any element ergonomically suited to be actuated along track 9 as seen in fig2 a inner conductor 16 includes a distal tip 17 and.