2003 Chevy Cavalear (2 door) antenna was a Wilson 1000 trunk mount. SWR was 2.5 ........grounded the trunk to the frame ect.ect. still 2.5 (keeping in mind that this was a Wilson and I never in 15 years had ever had a problem matching one of those) .never say never )-: anyway , I thought I would go with a Wilson magmount ...same results 2.5 )-: After all that ,I just let it be and she only ran a radio instead of having power , it was so so , but that 2.5 was always apart of my conscience )-: two years later she does her annual trade in for a 2005 Chevy Cavalear , same car but this time it's a 4 door model. Well , trunk mount now reads 1.1 around the band and the same with magmount (no grounding at all !! ) I just could not figure out that 2003 for the life of me !! What in the hell could have been the problem with that car ? I was wondering if it might have had to do something with the paint maybe ? I suppose I'll never really know what it was , but it surely wasn't matching out after hours of grounding and what not......I surely won't ever forget that damned car !! Weird