Here's the dump of /proc/cpuinfo:

I desoldered the old, fixed antenna, and replaced it with a removable antenna.

This photo shows you the location of the solder points for the antenna. The "tip", or center of the antenna wire, is a little longer than the braided shield, and is soldered to the point marked "Tip". The shield is just soldered together onto the portion marked "Shield".

Well, here is my WRTSL54GS's new antenna, liberated from an old BEF-11.