7-31-17 edit: Refreshing this thread with 2017 info.


Halfspec's FD3 S2000 Antenna Adapter

The adapter that will replace your dated telescoping antenna with a modern S2000 antenna. All while looking like a factory piece.
   
Here are some pictures of my personal car using the adapter with an OEM S2000 antenna:
   





   
This kit was designed from the ground up to be as plug and play as possible. The installation is completely reversible if you want to return the antenna to stock at any point in the future.
   
At the heart of the kit is the 6061 Aluminum adapter machined to 0.005" for a precision interference fit in the stock antenna base:

   
The adapter was painstakingly designed to properly connect to the stock internal Mazda antenna connections inside the base unit while insulating the adapter from the chassis ground.
   
   
Requirements
   
This kit works by utilizing the stock antenna base unit. Consequently, you'll need a stock antenna base unit along with all the parts it uses to make its exit out of the passenger rear quarter panel. If your grommet and locking retainer / nut haven't aged well simply due to the fact that it forms the external section of the stock antenna, you can order new ones using the Mazda part # FD01-66-A9Y. This is the part number for both the grommet and the locking retainer/nut.
   
You'll also want to purchase a compatible antenna to use with the adapter. This adapter was designed to work with OEM Honda S2000 antenna which is part number 39151-S2H-E01. You can easily google this part number and find a dozen dealers that will happily sell you one for ~$25 shipped. Alternatively, there are plenty of aftermarket solutions. As long as you can get one that's threaded for M5x0.8 (most are) it should fit very well. SnailBums is another vender here and a friend of mine who sells quite a few aftermarket antennas which work well with this kit. Please see the post below for information relating to his antennas.
   
   
Installation
   
See the installation tutorial here

   
Purchase


I have 22 antenna adapters left as of 7-31-17 and once they run out I'll decide whether I want to make another batch.
   
Right now I only have two shipping options. One for within the USA and one to Canada. US Orders are shipped USPS Priority with tracking. Canadian orders are shipped 1st class (priority is available but it's closer to $30)
If you're interested in the adapter and live outside of these areas, please PM me and we can discuss it.   

Orders will normally ship within 24hrs.

Please let me know if you have any questions / comments
Lane[/quote]

I feel like I should buy one...

Everyone needs one, even if your antenna is working..... It will break eventually. 
Just installed mine, really simple and it works great!


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So everyone uses a s2000 antenna? Do you have the part number by any chance?

It's in the description of my ebay listing.

Lane

does this work for fc also? how about na miata?

Negative on the FC. Had a member try it a while back.
I wouldn't expect it would fit any other car besides an FD unless the 90s miatas shared an antenna unit with the FD.

Lane

Ordered

As my car gets closer to completion, I would like to pick your brain to find out some of the people you used for your interior work. I have those pictures saved yet no one around here seems to think they can do as quality of a job

I installed one of these on Nick's FD.   Very easy install and it looks great.   Nice piece!