I used to use a Blaupundkt Berlin Electronic.. $1400.. comes stock in a Porsche Turbo .. and tucked nicely up under the dash when not in use, (out of sight), but I lost too much sleep worrying that some knot head would find it and steal it.. so.... I use the simplest am/fm/cd player I can slip in to the hole.. then you mount a clicker switch behind it that is open when the radio is in place, and the contact closes when you pull it out.. hook that to your loudest air horn you have, or a stick of dynamite, or those electric coil wires interwoven through your seat.. let some dumb ass try to steal it, either the neighborhood gets a blast of air horn, or someone gets the $hit shocked out of themselves.. for get the dynamite, it ruins the jeep..