I downloaded both radio's 2.08 & 2.10; I just installed 2.10 radio on my phone last night and got a 1 bar increase in my house, under normal use by now my phone would be at 66%, today it is at 78%, so that's just my 2 cents....
Here is the links to both files: The original: (in case you want to go back)
http://rapidshare.com/files/35115492...08.50.08_2.rar
and the 2.10 new one:
http://rapidshare.com/files/37710458....08_2.rar.html
I obtained these from somewhere in XDA, I didn't make them. They will work for the T-Mo US with 1024 MB. Using it on mine!
EDIT: Here is the XDA link: If you are using a T-Mo 1024 don't download the X.XX.51.XX Radio's!!!!! Read the thread and you will find out why.
http://forum.xda-developers.com/showthread.php?t=611787