What is the size of the threading for the Antenna studs?

[wct69]

I have a 2000 IS with both whips, radio and CB.
I want smaller antenna.  I will likely go with Firestix .
What I don't know and cannot seem to find reference too is the
size of the threaded studs that the stock antenna whips mount onto.
While I realize that this will cost me points on my man card,  I will ask any way.
What is it exactly that I need to know to order these correctly?
I think it is likely:
Thread size
Pitch ( I think that is the distance between the threads????)
The length of the threaded stud

So,  I need both the information and whether or not I have the necessary information and terminology down.

Any advise in clearing up this glaring point of ignorance on my part would be greatly appreciated.
Chris

[Evie]

I'm also replacing my antenna.   Just checked with my tap & die set....its 7mm 1.00. 
I have a 2000 I/S.
Let me know what antenna you decide to get...I'm shopping.

[icandoitfaster]

I too have a 2000 Interstate and would like to change mine. My Valk sits in a heated shed but the antenna hits the door frame every time I go in or out and a shorter antenna would fix the problem. Let me know what you find that works.
paul

[Bagger John - #3785]

Some of the Harley "shorty" antennas used a 6mmx1.0 thread. Here's one from Sierra:

http://www.sierra-mc.com/proddetail.asp?prod=MET-RAM-ANT

That might be tapped out to 7mmx1.0 or an adapter fashioned.

[ValkISDan]

I played around with other antennas but ultimately just cut the original down. I couldn't get the aftermarket antenna mounts to look decent on the IS. Yes my reception is diminished but I am using the MP3 player more anyway.

[ShiftHappens]

I bought an antenna from Advanced Auto.

http://shop.advanceautoparts.com/p/metra-electronics-replacement-mast-cf-rm1r/6050138-P?searchTerm=mast+antenna

It comes with adapters. I don't use the radio much but still wanted it to work. I capped the CB antenna as I never use it. I like I can put cover on bike at night when travelling without having to mess with antennas.

The antenna is only 8 bucks, so you could just buy it for the adapters if you want to go with something else.

[wct69]

Thanks for all the help gentlemen.  I found what I think will be at least a good temporary solution.
Beanman put me on the trail.
I ended up with a Metra 17" Fiberglass mast, Model number CF-RMF2.
It did come with adapters and fitment was easy.
At $13.49, it was hard to beat.

I will continue to try and contact the folks at Firestiks and see if they have matching masts for both the antenna and the CB side.