Dab Ariel fitting astra h interference while driving?

Fitting a dab Ariel to astra like the one in pic , it plugs i to android double din head unit via usb . I mounted the Ariel on the left side of the windscreen, removed the a piller cover and ran wires down behind glove box to stereo . Sanded off a section of body paint arou d the Ariel for the grounding sticker .... show more Fitting a dab Ariel to astra like the one in pic , it plugs i to android double din head unit via usb . I mounted the Ariel on the left side of the windscreen, removed the a piller cover and ran wires down behind glove box to stereo . Sanded off a section of body paint arou d the Ariel for the grounding sticker .

It runs ok while car is stationary but soon as you drive signal drops to nothing and its all over the place .. anyone any ideas what to try
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