Hello, I have a 2005 Vectra C its a 1.9 CDTI SRI 8v and am moving my DAB stereo from my other car to this car. However i wanna leave the horrible 2nd DAB magnetic aerial behind (makes me look like a taxi!)

I was looking at this cable, but it says it doesnt work if the exisiting aerial is amplified. so my question is. is my aerial amplified? I dont think it is as i get awful FM signal and this is why i want to fit my DAB HU!

Or does anyone have any suggestions or recommendations on a DAB aerial?