am fm radio

Correct me if I'm wrong but I don't think there is an adjustment that you can do yourself for FM. I know there was an adjustment for AM. There was a little hole with a screw either near the tuning knob or somewhere around where the antenna goes in the radio that's for AM only I believe.

For FM you may have to get a signal booster or have a tech do the adjustments for you.

I would first check longgones suggestion it's worth giving it a try and it doesn't cost anything.
But if you're getting AM stations this may not be the problem.

Fishbreath also has a good point. If you have a telescoping antenna try adjusting to different lengths. Maybe do this first if you haven't.