I'm just wondering about my antenna configuration...I have a Wilson Lill Wil and a radio shack Scanner mag mount, I'm getting ready to trash the radio shack mount and get a MOR Hustler roof mount. I'm also seriously considering upgrading my Lil Wil for a roof mount Wilson 5000, but before I start drilling holes My question is where should the holes be put for best radiation patterns and interference with my scanner antenna. I have a 2005 PT Cruiser and plan to place the Wilson 5000 dead center on the roof. Does a passive antenna cause much interference with an active antenna? I'm not worried about my car looking like a RC car! I also in the future would like to install a 2m roof mount, just haven't found one yet, thanks for you comments.