High swr and only 1 tx light.

[Ferryman]

Hi guys.
I have a stabo 3003 in my Scania truck and I fitted a stud mount through the roof and installed a thunder pole orbiter. I cannot get a low swr and for some reason when I key the Mike I only have 1 tx light instead of 4.
I have tried changing the stud mount and coax and even the CB itself but still have the same problem. Looking for some advise please.

[stampman]

YOU NEED AN SWR METER AND IT SOUNDS LIKE THE ANTENNA NEEDS SHORTENING BUT YOU CAN ONLY TELL THIS WITH A METER

[Ferryman]

Ok I have a meter but it doesn't seem very stable. I'm getting a reading of around 3 which I know isn't very good. I can trim the whip if needed. Do you suggest 1/4 inch at a time?

[stampman]

if its higher on ch 40 than ch1 it needs shortening and the are plenty post's about swr'ing on the forum

[AppleTree]

VSWR is always a problem on lorries because of all the metal behind.
Tippers especially.

Anyway, have you sorted it yet?