pipe not shown within the same well as the well 600 configured to host an antenna a coaxial cable 630 connects a power source not shown for example a radiofrequency generator stationed on the surface to the slotted liner 622 the coaxial cable 630 has a central conductor 632 surrounded by a dielectric insulating portion and an outer conductive shield 634 in some embodiments the outer conductor 634 is also wrapped in an external insulating layer at the distal end of the well the coaxial cable 39 s central conductor 632 is electrically connected to the well 39 s slotted liner 622 in some embodiments the connection to the liner 622 is achieved using a metal contact ring 660 to which the central conductor 632 is electrically connected 664 e g welded the contact ring 660 is mated with the liner 622 in some embodiments an insulating section 650 is used for example to separate the slotted liner 622 from the well wall 620 the insulating section 650 is a hollow cylinder that allows the coaxial cable 630 and any other cables or pipes e g an oil collection pipe to pass through it in some examples the insulating section 650 is ceramic as shown if fig6 the well 600 is supported in the earth 616 by a cement casing 614 the cement 614 is susceptible to cracking if subjected to excessive heat in such embodiments it may be desirable to restrict.