Installing DAB - Breaking up?

Hi All,

I have finally got around to installing DAB into the MK1.. I have ran a magnetic aerial up the A frame and out onto the roof via the back door seal looks all ok to be honest wire is well hidden. 

Problem I am having is  I am  getting a very weak DAB signal. Mmy stereo has the option to power the DAB aerial which is turned on.... but this does not make a difference I have tried everything.

The question i have is... The blue wire on the back of the head unit which is remote ( Used for amps etc) I use to power the Analogue aerial on the Octavia, otherwise it gets a weak analogue signal. WIth this wire powering the Analogue will this stop the power going to the DAB? 

Personally I do not think it will, but I am stuck with this! 

My next option is to buy a different DAB Magnetic aerial, the one I have come from eBay.

Anyone installed DAB in a MK1 got any tips please?? My stereo is a Sony MEX N600

Thanks,