|"I want to connect an antenna to first router" |
Is it a wireless router? What brand/model are they?
Exactly what are you trying to achieve here?
Is one of these routers connected to your Internet Cable/DSL modem? Which one? Are you trying to set up two separate LANs? or are you simply trying to use the second router to expand the area of coverage?
Sorry but I'm having difficulty understanding the context of your question.
Goin' Fishin' (Some day)