The TS2100 internally has a Trimble ACE-II or ACE-III receiver. Any standard
5V GPS antenna will work, they are a dime a dozen. If you want to get more
high-end with a timing antenna, I would just watch eBay and be patient for
one of the Trimble Bullet antennas (do a Google search with the part number
to make sure the connector and voltage is what you want) or a HP /
Symmetricom / Andrew / Micropulse / whatever timing antenna you want. You
can usually get them for like $30-$50 for one in good condition (sometimes
even NOS).

Jason


> I've resuscitated a left-for-dead TS 2100 and now am in need of a Trimble
> Bullet III, or equivalent, active GPS antenna.
>
> It's a current item for Symmetricom and they want more dinero than I want
> to put into this 12 year old clock.
>
> I found one supplier online, but they have not been very responsive to

queries.
>
> Anyone have a dealer they can recommend?