Tips to optimise.Keep DAB app up to date. Download the latest 'DAB Z' app from the Googleplaystore.Ensure the antenna is installed about 8 inched below the top chassis section of the window.Scratch paint of on A-piller chassis to make contact with DAB copper strip.Can link to the cars original DAB antenna if you have one by purchasing this link below.OEM DAB ADAPTORThings that can intefere with signal.Out of date DAB app.Heated windscreen.Antenna too close to the top chassis.Wifi based DVR cameras.Wiring coiled around electrical components of the car like ECU modules.Not having metal contact on chassis with copper strip of DAB antenna.