Running a screwdriver on my ford ranger pickup and have had no real problems up to now. Starting to see a flucuation of the swr on 40 meters and the wierd thing is that it is more pronounced in a certain neighborhood. I can drive to work and the swr will stay perfect. I run thru this one area (in Cincinnati) and it bounces all over and I have to retune. Sure wouldnt want to live in that area. Anyway, I'm getting ready to check all the grounds and make sure. Any thoughts?