Im trying to tune my Wilson Lil Wil but im having a little trouble. I do have a SWR meter. I already cut 1/4 inch from it but still no luck. On channel 1 it reads about 1.6 but on channel 40 its close to 5 and on channel 20 its on 3. Should i cut 1/4 inch from it again or should i cut it more?