I have a coba ultra 19 iii in myt truck what is

get a tech you can't do it.

www.cbtricks.com has the information you need.

throw that antenna away and get a lil willie by wilson. Cost about $40.00 should make a great improvement

4 watts max

you can't

why , you can only run 4 watts anyway.

google it

i got a couple of them and i have them talking really good for what they are. if you go inside you can turn up the pods also you can take a small screwdriver and spread those coils inside near the back of cb!

find DM1 and clip it. then you will have full modulation.

The external speaker jack was not designed for a head set. It has too much power it over loads head set. You need to solder a resistor in line with the negative wire. You will have to experiment to see which value gets the audio just right for the head set you are using.