Need help/suggestions on improving Picture Quality

[dbalone]

I have the tivo model R-10. I recently purchased a new Sony 30" HDTV CRT. I am currently getting my HD OTA. I will need to stay this way for awhile until funds allow another move up. The directv picture could be better. Some days I think it is pretty good and other days not so good. There are alot of settings to adjust with this tv. Does anyone else have a similar tv and what settings helped you get a better picture. Directv has not been much help.