Bluno external aerial required

Currently under development, I am currently using a Bluno Mega but would like to mount it into a metal (aluminum) box.
Is there any way to connect an external aerial? Cut track and solder?
If so, suggestion on aerial, connecting wire, distance between aerial and Bluno.
I am looking at a production run of between 5 and 100 units. Any ideas, help or suggestions would be great.
thanks
Kingsley
Is there any way to connect an external aerial? Cut track and solder?
If so, suggestion on aerial, connecting wire, distance between aerial and Bluno.
I am looking at a production run of between 5 and 100 units. Any ideas, help or suggestions would be great.
thanks
Kingsley