Sacramento guys, where do you go to tune your CB antenna?

Save your money. They'll charge you about $30-50 to tune it. Go to Right Channel web page and buy a tuner for around $30. It's good to tune it once a year or so.
 
If you need an open area, prairie city is pretty open and not to hilly. Bonus, you can drive around the 4x4 section while your there.