The radio on my focus is rubbish (pioneer aftermarket)
It only picks up strong signals and gets interferes with them (bbc radio etc)

I have noticed if you tune in a station and it's fuzzy, if you switch the engine off it stays fuzzy for 10 secs then signal gets good. I assume this is after the alternator finishes charging. The alternator was new very recently, but pr.oblem has been there a while, any sugggestions where to start looking for a fault/fix?

Cheers