First off, I want to report that the Opel GT antenna that others brought up will fit an '06 Cobalt with NO modification. I decided to try putting the antenna on before drilling and tapping it and it fit like a glove. The Opel GT antenna has 100% reception, and much better than the AntennaX antenna. The Opel GT antenna is 14" which makes it about 2" longer than the AntennaX antenna. You can get the Opel GT antenna from GM Parts Direct:
http://www.gmpartsdirect.com/results...umber=25805645

The second mod is, I finally got my Halos, one of the LEDs are burnt out, but thats no biggie.

Comparison to the old AntennaX shorty






And my Halos, with Silverstars

 

damn. i think im gonna have to get that antenna now that youve shown me on a cobalt.

well done man. way to make me spend more money on the car lol

 

I used to be a telemarketer...wonder if that had anything to do with it. LOL

 

ugh.. once again, I get fucked for having an 07 =( Different harness, different DRL's, different antenna mount, no g85 package, ****!
I know some of the earlier 07s had the g85, but still....makes me sad I couldn't get it.

 

Tricky, you bastard... stealing my idea... LOL

 

You're welcome.

 

So I read the other post in the general forums, looks like I could retap it into a 7mm antenna without too much work.
I'll wait for that how-to that supposed to be coming out.
Hopefully the bits I need wouldn't be too expensive, I can use a 15/64 bit to retap the thread to 7mm accoring to your chart, correct?
Home Depot doesn't carry much metric **** lol

 

yea they dont carry crap. they had about 5 sizes and the guy was about to gimme a 1/4 and said that should fit. I am gonna look around and see what I can find.

 

Some 06's have 7mm. Do you know if you have 6 or 7mm?

 

well let me take my opel and check it on my car.... why did i not think of this first.... if it fits... the opel is 7mm if it doesn't its 6mm

Just checked... my opel doesnt fit... just a touch too small.

 

you have a burt out LED

.

 

I said that in my first post, I have a new set of LED's on the way.