Got a question. Does the Cobra 75 come with the control box? And what antenna did you guys use with this cb?

It has the brain box with a mic attached to it. You can see it by clicking the link below.
http://www.mghusa.com/Products/Two-way-radios/c75-wxst.html
Everything is controled by the mic.I use this cb and love it.It has great range and sound.I use a 2' firestik mounted on my roof rack with a spring and a ez-over mount..

I see there is several different wattage antennas what should I look for.

I use a firestik II 3' antenna with the Cobra 75... end up with an SWR of 1.1 Mine is mounted on the front bumper.

Your CB will put out 4 watts, the high up ratings are what the antenna is capable of withstanding.