Somebody asked what the "radio waves" speech was all about. I believe Tom is trying, without reference to Christianity, to say that we are all immortal in the sense that radio waves are immortal. Even though FDR is dead, his words will continue to bounce, forever, like radio waves, from star to star in the universe. This struck me as a quite touching and genuine moment in the film. I was less enchanted with the biography provided for Tom, especially as it became known at the most opportune moment (the scene when Tom is being heroic). But the performances by the three leads were enough to keep me interested in this bittersweet film.