The Comm is at the Contaminated Zone at Southwest.
After picking up "Faith" go into the basement down the stairs next to the elevator. Now this was very buggy when I did this. So down in the basement is a lever, the power switch. You have to use it to turn the power off and then use it again to turn power on again. Then the elevator works and takes you up.
Once up there, the comm is on the balcony.
If you get the "you're not allowed in the area" bug when arriving at the top. Get to the balcony as fast as possible. Dodge there. It worked for me.