Poor FM reception

[Astech101]

Hi guys, 

 

I have a 1995 2.6e Cabriolet with a new Blaupunkt Madrid 200 BT head unit and a newly fitted Beru A350 electric aerial. The headunit works great and the aerial fits fine with the power extension and retraction working great. However, sadly the FM reception is still poor. Having owned many VW's and Audi's over the years I'm aware that you need to fit the aerial adaptor that usually boosts the OEM aerial signal, however as this is an older car with a generic aerial is that still required? 

Any pointers would be appreciated! Thanks, Matt