Got a pioneer stereo in my fiat rapido a class. Bog standard no usb no bluetooth. Does not appear to work properly as radio is poor to say least. Could be aerial not checked. However fancy a more modern unit. Can anyone recomend a replacement unit along with an aerial (should I need one) Also is it best to replace with another pioneer due to connectionsome or doesn't it make a difference. Assume all speakers will just be plug and play?