Install WIFI antenna on Batwing Mod

rwbradley wrote:
I decided to mount a WIFI antenna for those few times when WIFI actually works for me.

What I had:
- WIFI Antenna with N connector
- RG58 cable
- old Linksys WRT54G router running DDWRT configured as a Universal Wireless Repeater to repeat WIFI from campground to Router and than my devices connect to it using my SSID

Greetings,
Care to share more of the setup of the router?
I am looking to do the same thing as a poor mans radio labs setup.. However, setting up the DD-WRT as the wireless repeater has me a bit confused to the process that I would be using out in the field when I am looking to connect to other networks.