Talking to the space station or satellite is a little different since there is a completely open line of sight from the ground up to space. And I am glad to hear that you can talk that far. But that is definitely not going to be the norm for most people.
And it doesn't matter if it is a $20 hand held radio or a $1000 hand held radio, UHF is only going to reach so far depending on location and terrain. UHF is a line of sight. After a certain point then the curvature of the earth will come into effect. UHF doesn't skip off the atmosphere like HF does.
My last reply to this thread is based on personal first hand experience using VHF and UHF while I was in the military. Now if we were on top of the Granite Mountains on Ft Irwin, then we could reach farther with a hand held, but we still weren't getting the range you say you are getting.