Get a Ham radio license ($7), have a garage sale or sell some of those old movies you never watch anymore then get a 2m radio ($50 or so at a Ham-fest if you look, $150+ new), then talk to them when they go by. (Details if you're actually interested. Always glad to help out someone interested in Amateur Radio) It will take you a while to get your chance, but hey... it might be worth it to prove your theory to yourself so you don't have to go on blind faith of it.
I know the space shuttle goes up there for cetain, I got to talk to them once years ago. And no, it couldn't have been an earth based station because I was hooked up to my directional antenna, and had a couple of other radios going on different omni-directional antennas. So I should have gotten the signal on all three radios if it was ground based.
Sorry, but as for the ISS and Space Shuttle, I'm not budging... I know for a fact, without a doubt that they make it into orbit, and the shuttle stays up there long enough to make many contacts before touching down. The ISS is obvious that it stays up there, and although I don't have a QSO card from them yet, many others do. So indeed, people inhabit the ISS. Unfortunately for FE, not all video footage is fake, nor all radio transmissions earth based.
You don't even have to believe in a round earth I don't suppose. Why is there any reason for there not to be people on the ISS anyway?