I'm trying to find a replacement whip antenna that will connect directly to the aftermarket Pioneer radio in my Buick LaCrosse, to replace the in-glass antenna that it is currently connected to which uses an amplified antenna adapter. Which stores carry them and which companies do installs of these antennas? I asked the mobile Geek Squad tech at best buy and they suggested a rubber-ducky type antenna but I know those don't work as well as a real steel whip. He also said that only certain kinds of antennas could be installed on certain cars. Is that true?