Anything will do - the N type is large enough that you can fix the bulkhead to the can wall securely. BNC tend to be a through hole and nut which is hard to fix

Anything will do - the N type is large enough that you can fix the bulkhead to the can wall securely. BNC tend to be a through hole and nut which is hard to fix square to the side of a can. You can even make a bigger hole and put an entire USB wifi dingle in the can at the correct position but it takes a bit of trial and error because you don't know where the antennea is inside the plastic