i have a wilson antenna with a midland handheld and an swr meter. i tried tuning it and the meter reads 1.8 with F.S. of 2 on channel 19. whats the F.S. and the meter showing ? on channel 1 its near 1.0 on the scale and on channel 40 is around 2.4....is that the SWR ?? the antenna is at its lowest point so it cant go any lower. its on the right hand edge of my roof...should it be moved ?