I updated my G1 some of the latest things.
- ROM upgrade to Cyanogenmod 126.96.36.199
Move the downloaded update-cm-188.8.131.52-signed.zip to sdcard
Turn G1 on by pressing HOME + POWER button. From recovery menu, select update from zip and perform ROM upgrade.
- 10 MB extra RAM fro GPU memory map hack
Move boot-cm_2629-dp_mem-xtra.img to sdcard
- Update for Radio to version G1-radio-2.22.23.02
Move G1-radio-2_22_23_02.zip to sdcard
As described in (1), update to this zip file.
I think all of my reception problems with android got fixed.