Hi. What would happen if the green pad in JP2 is damaged. Can I still use external antenna?
Yes…you wouldn’t be able to use the on-board antenna
Sever the connection there @ JP2 (desolder, cut) and puta solder blob on connecting the pads to its immediate left
so that it looks like this
And you can use the rest of the guide 
https://learn.sparkfun.com/tutorials/simultaneous-rfid-tag-reader-hookup-guide/using-an-external-antenna
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Good day. Thank you for anwering my question, but just for clarification: Is the L1(Inductor) not in use when using the external antenna?
Thank you again