I have been having problems lately with crappy radio reception

. Installed a new ariel over easter hoping this new giant (1.75m) boosted ariel would help but still get poor reception when further away from chch than darfield. I dont know a hell of a lot about radios and was wondering if someone new whether some brands of head unit have better signal pick up than others. I am currently running a pioneer. that is about 10yrs old. any help,tips or otherwise would be greatly appreciated.
thanks, Macca