I've got one of these glass mount top centre of my windscreen http://www.dabonwheels.co.uk/Kinetic_DEGA-T4002_telescopic_glass_mount_DAB_car_aerial.html this is the easy install.
If you want a better signal then go for converter/body mount type further down the page. I don't listen to much music in the Zed so went for the easier option, it's good where the DAB signal is good.