First
follow these instructions
to open your WHR-G125.
Unsolder
the stock antenna wires from the board. You should use a solder
vacuum sucker and a soldering iron with a sharp tip. You don't
need a lot of heat. The onboard antenna connections are in
close proximity [Fig 4] to each other and it's easy for the
molten solder to jump the contacts. If this happens don't
despair. You have not ruined the board. Just use the vacuum
tool to remove excess solder.

Fig. 4 Buffalo WHR-G125 on board antenna contacts
Depending
on the type of external connector you intend to use you could
drill a hole in the router enclosure and mount the connector
there. I decided to go for a non-invasive option that consists
of taking out the original antenna and placing the connector
in the hole where the antenna was attached.
To
remove the antenna squeeze the tabs as indicated [Fig. 5]
and pull the antenna away from the router.

Fig. 5 Remove WHR-G125 stock antenna
1,
2,
3, 4,
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