Midland 79-290. Wilson 5000 through the roof near the front, center mounted. Palomar for use way off road. SWR meter in line between the CB and Palomar. I need to tune the thing and the SWR is high. The meter has a "slide" to adjust the SWR, but I would rather get it right. I have tried moving the antenna a little at a time on 1 and 40, but still seems to be high. How to fix the SWR and what to lok for please??