Through the glass antennas are not the best antenna for any radio. They may be cute and cool, but they lack in number of areas. They have to be placed just right, they can't be mounted in certain areas, such as the gray area of the window, plus they have to be mounted perfectly across window defrosters. The best antenna is one mounted permanently dead center in the roof. Get yourself something like a quarter wave in the primary frequency range you want and that will do just fine, besides, that will work much better. If you have to use a mag mount, so be it.