Tuning the antenna.

(a) Set the radio to the lowest channel. For a dual band CB, this will be on the CEPT band.
(b) Set the FWD/REF switch to FWD.
(c) Set the radio to transmit.
(d) Adjust the CAL knob so that the meter reads at the end of the scale, where you may see the word SET or CAL.
(e) Switch the SWR meter to REF or SWR.
(f) While transmitting, take the SWR reading and make a note of it.

(a) Set the radio to the highest channel. For a dual band CB, this will be on the UK band.
(b) Follow steps 1(b) to 1(f) above.

Where was the SWR reading lower?
Channel 1:   Shorten the antenna.
Channel 40:   Lengthen the antenna.

Steps One to Three should be repeated until the SWR readings are about the same on the highest and lowest channels. The SWR will usually be lowest on the middle channel.

Notes and tips.