I just found this site in my search to try and find a book I read many years ago (pre 1985?). I still remember it, especially the ending. Basically, it's about aliens having conquered earth and enslaving humans for years. Our hero fights for liberation, which I don't remember much of, but I do remember that he wins in the end by utilizing Alien technology against them. He places an A-bomb on the transport platform and sends it back to the alien's home planet where it detonates and destroys the aliens. Any ideas?