Thanks for the info. You are in fact the only person yet to advise against a 6db antenna. I am mainly in hilly environments, so probably better with a low db antenna. I have heard no one bring up ground plane issues with this setup, but I have read on other forums that a magnetic mount will give you higher SWR numbers due to RF coming back down your cable. Additionally it has been stated that magnetic mounts don't have a true ground plane as it is insulated from the vehicle roof. If this information is not necessarily true, I do not want to spend the extra time getting up inside my headliner to install a through hole type antenna connector. If it will make a substantial difference to do so. I will spend the time installing a through hole type. Anyone have experience with both?